Publications by authors named "Kathirvel Brindhadevi"

31 Publications

A review on graphene / graphene oxide supported electrodes for microbial fuel cell applications: Challenges and prospects.

Chemosphere 2022 Jun 15;296:133983. Epub 2022 Feb 15.

College of Medical and Health Science, Asia University, Taichung, Taiwan.

Microbial Fuel Cell (MFC) has gained great interest as an alternative green technology for bioenergy generation along with reduced sludge production, nutrient recovery, removal of COD and color, etc. during wastewater treatment. However, the MFC has several challenges for real-time applications due to less power output and high ohmic resistance and fabrication (electrode and membrane) cost. Several kinds of research have been carried out to increase energy production by reducing various losses associated with electrodes in the MFC. Though, carbonaceous electrodes (carbon and graphite) are the key materials for the anode and cathode side, since these have a higher surface area, good biocompatibility, low cost, and good mechanical strength. Graphene or graphene oxide-based nanocomposite can be an ideal substitute for electrode modifications and an alternative for an expensive anode and cathode catalyst in MFC. Graphene oxide synthesis from waste material such as waste biomass, agricultural, plastic waste, etc. is added advantages of minimizing the cost of the electrodes. But, the synthesis of graphene is quite expensive and has limitations in economic feasibility for bioelectricity production in MFC. Hence, the present review deals with the anode and cathode electrode modification with graphene-based nanocomposites, synthesis of graphene/graphene oxide from various raw materials, and its application in MFC. The current challenges and future outlook on graphene-based composites on MFC performance are also discussed.
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http://dx.doi.org/10.1016/j.chemosphere.2022.133983DOI Listing
June 2022

Green synthesis of Zirconium nanoparticles using Punica granatum (pomegranate) peel extract and their antimicrobial and antioxidant potency.

Environ Res 2022 06 19;209:112771. Epub 2022 Jan 19.

Research Center of Producing and Development of Products and Innovations for Animal Health and Production, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai 50100, Thailand; Department of Food Animal Clinic, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai 50100, Thailand. Electronic address:

The biosynthesis of metal oxide nanoparticles provides an excellent alternative to the chemical synthesis approach. The aim of the current study was a green and eco-friendly synthesis of zirconium nanoparticles (ZrNPs) from fruit peels of Punica granatum (Pomegranate). The synthesis of ZrNPs was confirmed using a UV-visible spectrophotometer. The functional groups present on surface of ZrNPs were analyzed using FTIR. The average size of obtained ZrNPs was analyzed using SEM and DLS and it was around 20-60 nm. The antimicrobial activity of obtained ZrNPs was tested against Gram-positive strains (Bacillus subtilis and Staphylococcus aureus), Gram-negative strains (Escherichia coli and Klebsiella pneumoniae) and Fungi (Aspergillus niger) by agar well diffusion method. ZrNPs showed maximum zone of inhibition against S. aureus (19 mm) and A. niger (18 mm) at the maximum concentration of 200 μg/mL. The antioxidant scavenging activity of obtained ZrNPs was analyzed using the following methods: DPPH radical scavenging activity, Hydroxyl radical scavenging activity, Ferric reducing antioxidant power and hydrogen peroxide radical scavenging activity. This the first and foremost study on ZrNPs synthesized using P. granatum fruit peel extract reporting their efficacy as antimicrobial agents against Bacteria and Fungi. Considering the tolerance of zirconium towards human body, it can also be used as antimicrobial coating material on human implants.
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http://dx.doi.org/10.1016/j.envres.2022.112771DOI Listing
June 2022

A novel synthesis, analysis and evaluation of Musa coccinea based zero valent iron nanoparticles for antimicrobial and antioxidant.

Environ Res 2022 06 19;209:112770. Epub 2022 Jan 19.

Research Center of Producing and Development of Products and Innovations for Animal Health and Production, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai 50100, Thailand; Department of Food Animal Clinic, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai 50100, Thailand. Electronic address:

Zerovalent Iron Nanoparticles (MC-ZVI NPs) were synthesized from Musa coocinea peel extract as reducing and stabilizing agent using a novel synthesis technique. The synthesis of MC-ZVI NPs was confirmed using UV-vis spectroscopy showing a sharp absorption peak at 341 nm. Further the chemical and structural characterization of MC-ZVI NPs were performed using Fourier Transform Infrared spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and Dynamic Light Scattering technique (DLS). FTIR analysis revealed the presence of phytochemical molecules associated with the MC-ZVI NPs. SEM analysis revealed the synthesized MC-ZVI NPs were in spherical shaped, while DLS analysis confirmed the synthesis of poly dispersed and non-homogenous MC-ZVI NPs. The antimicrobial efficacy of MC-ZVI NPs synthesized using Musa coccinea peel extract was tested against bacterial (Escherichia coli, Staphylococcus aureus, Klebsiella pneumoniae, and Bacillus subtilis) and fungal (Aspergillus niger) pathogens. But MC-ZVI NPs exhibited maximum of 19 mm zone of inhibition against B. subtilis and A. niger. Further the free radical scavenging activity MC-ZVI NPs was confirmed using DPPH, hydroxyl radical, hydrogen peroxide, FRAP assay showing displayed effective antioxidant activity. Thus, the present idea will give a fast and cost effective approach to synthesize MC-ZVI NPs with antimicrobial property for application in biomedical purposes.
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http://dx.doi.org/10.1016/j.envres.2022.112770DOI Listing
June 2022

Fungi fabrication, characterization, and anticancer activity of silver nanoparticles using metals resistant Aspergillus niger.

Environ Res 2022 05 11;208:112721. Epub 2022 Jan 11.

School of Renewable Energy, Maejo University, Chiang Mai, 50290, Thailand; College of Medical and Health Science, Asia University, Taichung, Taiwan. Electronic address:

The purpose of this study was to assess the bio-fabrication possibilities of pre-isolated (from bauxite mine tailings) metal-tolerant Aspergillus niger biomass filtrate and the anticancer potential of synthesized silver nanoparticles (AgNPs) tested with a Human Cervical cancer cell line (HeLa cells: Henrietta Lacks cells). The nitrate reduction test demonstrated that A. niger has the ability to reduce nitrate, and filtrate derived from A. niger biomass efficiently fabricated AgNPs from AgNO, as demonstrated by a visible color change from pale greenish to brownish. The UV-visible spectroscopy analysis revealed an absorbance peak at 435 nm, which corresponded to the AgNPs. These AgNPs have been capped and stabilized with several functional groups related to various bioactive molecules such as aldehyde, benzene rings, aldehydic, amines, alcohols, and carbonyl stretch protein molecules. Fourier-Transform Infrared Spectroscopy (FTIR) analysis confirmed the capping and stabilizing chemical bonding pattern. Scanning Electron Microscopy (SEM) revealed that the synthesized AgNPs were spherical, with an average size of 21.38 nm. This bio-fabricated AgNPs has in-vitro anticancer potential when tested against the HeLa cell line due to its potential size and shape. At 100 g mL concentrations of this bio-fabricated AgNPs, the anticancer activity percentage was found to be 70.2%, and the IC value was found to be 66.32 g m. These findings demonstrated that the metal-tolerant A. niger cell filtrate could produce AgNPs with anticancer potential.
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http://dx.doi.org/10.1016/j.envres.2022.112721DOI Listing
May 2022

Silver nanoparticles (AgNPs) fabricating potential of aqueous shoot extract of Aristolochia bracteolata and assessed their antioxidant efficiency.

Environ Res 2022 05 10;208:112683. Epub 2022 Jan 10.

Research Center of Producing and Development of Products and Innovations for Animal Health and Production, Chiang Mai University, Chiang Mai 50200, Thailand; Department of Food Animal Clinic, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai 50100, Thailand. Electronic address:

This research was performed to evaluate the silver nanoparticles (AgNPs) fabricating potential of aqueous shoot extract of Aristolochia bracteolata and also assess the free radicals scavenging potential of synthesized AgNPs. The results obtained from this study showed that the aqueous shoot extract of A. bracteolata has the potential to synthesize the AgNPs and it was initially confirmed by color change in the reaction blend as yellow to dark brownish. Subsequently, a clear absorbance peak was found at 425 nm in UV-visible spectrum analysis. The functional groups involved in the capping and stabilization of AgNPs were confirmed by Fourier Transform-Infrared spectroscopy (FTIR) analysis and recorded about 10 sharp peaks 3688, 3401, 2980, 2370, 1948, 1642, 1480, 1280, 782, and 628 cm. The Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM) observations revealed that the predominant shape of the AgNPs was spherical and size ranged from 41.43 to 60.51 nm. Interestingly, the green fabricated AgNPs showed significant free radicals scavenging activity and were confirmed with ferric reducing assay, 1, 1-diphenyl-2-picryl-hydrazyl (DPPH), HO radicals, and 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radicals scavenging activity. Thus, after a few in-vivo antioxidant studies, Aristolochia bracteolata-mediated AgNPs can be considered as an antioxidant agent.
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http://dx.doi.org/10.1016/j.envres.2022.112683DOI Listing
May 2022

Fabrication, characterization, anti-inflammatory, and anti-diabetic activity of silver nanoparticles synthesized from Azadirachta indica kernel aqueous extract.

Environ Res 2022 05 5;208:112684. Epub 2022 Jan 5.

Research Center of Producing and Development of Products and Innovations for Animal Health and Production, Chiang Mai University, Chiang Mai 50200, Thailand. Electronic address:

The Azadirachta indica is an excellent and pharmaceutically valuable phytochemicals enriched traditional medicinal plant. The purpose of the research was to assess the ability of A. indica aqueous kernel extract to synthesize silver nanoparticles as well as their anti-inflammatory and anti-diabetic activity in vitro. The obtained results state that the aqueous kernel extract of A. indica can fabricate the silver nanoparticles and be confirmed by standard analytical techniques. Under UV-visible spectrophotometer analysis, the absorbance peak was found at 430 nm was related to the surface plasmon resonance of silver nanoparticles. The FTIR (Fourier-transform infrared spectroscopy) analysis revealed that numbers of functional groups belong to the pharmaceutically valuable phytochemicals, which act as reducing, capping, and stabilizing agent on silver nanoparticles synthesis. The size and shape of the silver nanoparticles were examined as 19.27-22.15 nm and spherical in shape. Interestingly, this kernel fabricated silver nanoparticles possess a reasonable anti-inflammatory (69.77%) and anti-diabetic (73.5%) activity at 100 μg mL and these were partially comparable with standards (anti-inflammatory: 81.15%; anti-diabetic: 87.9%). Thus, the aqueous kernel extract fabricated silver nanoparticles can be considered for further in-vivo study to assess the practical possibility to promote as a pharmaceutical agent.
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http://dx.doi.org/10.1016/j.envres.2022.112684DOI Listing
May 2022

Vibration, acoustic and emission characteristics of the chlorella vulgaris microalgae oil in compression ignition engine to mitigate environmental pollution.

Chemosphere 2022 Apr 30;293:133475. Epub 2021 Dec 30.

Department of Aeronautical Engineering, Sathyabama Institute of Science and Technology, Chennai, 600 119, India. Electronic address:

The petroleum fuel demand with high price and its exhaustion imposes a pressure to find an alternative. The fossil fuel shortage has been deteriorating over the past few years, because of the rapid increase in population. Many attempts have been made to increase the quality of biofuel with additives. In this paper, two types of nanoparticles such as carbon nanotubes (CNT) and alumina (AlO) in chlorella microalgae biofuel were analyzed by experimental method. The added CNT and alumina act as a catalyst that induces complete combustion with retarded emissions. In addition to above, the noise and vibration qualities are also measured. A series of test conducted using single cylinders, four stroke, naturally aspirated compression ignition diesel engine was run by using pure diesel and also different fuel blends 'such as B10CNT50A50 Chlorella (Microalgae Biodiesel 10% + Diesel 90% + CNT 50 ppm), B20CNT50A50 (Microalgae Biodiesel 20% + Diesel 80% + CNT 50 ppm + AlO 50 ppm) and B30CNT50A50 (Microalgae Biodiesel 30% + Diesel 70% + CNT 50 ppm + AlO 50 ppm). At a constant load condition, all experimental tests were conducted at four different speeds such as 1500 rpm, 2000 rpm, 2500 rpm and 3000 rpm. The reference fuel of diesel B0 results was compared with blended fuel. From the results, it has been found that the nano additives of CNT and alumina reduced the greenhouse gas emissions of CO compared to plain diesel. Only considering the blended fuel, as the percentage of biofuel increases, the emission of nitric oxide and carbon dioxide is decreased with significant reduction in the amount of noise and vibration and also the combustion and performance qualities were also improved. The highest benefit in terms of all factors was achieved in the fuel blend of B30A50CNT50 amongst the other blends.
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http://dx.doi.org/10.1016/j.chemosphere.2021.133475DOI Listing
April 2022

An assessment of agricultural waste cellulosic biofuel for improved combustion and emission characteristics.

Sci Total Environ 2022 Mar 16;813:152418. Epub 2021 Dec 16.

School of Renewable Energy, Maejo University, Chiang Mai 50290, Thailand; College of Medical and Health Science, Asia University, Taichung, Taiwan. Electronic address:

The need for an alternative fuel has been growing swiftly owing to the extravagant use of fossil fuels as a sole energy source for all purposes. This paper investigates the performance, emission and noise characteristics of cellulosic biofuel. A series of tests were conducted in a single cylinder, four stroke DI engine to determine the performance measuring factors such as brake thermal efficiency (BTE), brake power (BP), brake specific fuel consumption (BSFC) and emission factors such as CO emission, NO emission, CO emission and smoke and then, the HC emission rates were also measured. All tests were carried out at different load conditions of 25%, 50%, 75% and 100% with the constant speed of 1500 rpm. The fuel blends taken for the tests were diesel, E5, E10, E15 and E20. The E20 comparatively showed lower performance than all other fuel blends. However, when considering CO and smoke emission, the E20 fuel blends produced better reduced emission. The lower-level ethanol diesel blend showed better BT as well as BTE and BSFC. From the above findings, it is clear and evident that cellulosic biodiesel blends can be an optimal solution to meet the ongoing energy demands.
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http://dx.doi.org/10.1016/j.scitotenv.2021.152418DOI Listing
March 2022

Microwave assisted biodiesel production from chicken feather meal oil using Bio-Nano Calcium oxide derived from chicken egg shell.

Environ Res 2022 04 4;205:112509. Epub 2021 Dec 4.

School of Renewable Energy, Maejo University, Chiang Mai, 50290, Thailand; College of Medical and Health Science, Asia University, Taichung, Taiwan. Electronic address:

Environmental concerns have initiated the search for greener measures to mitigate pollution issues. Bio Nano CaO was synthesized by reducing CaO extracted from chicken egg shell using tea decoction. The synthesized material was characterized by physico-chemical techniques such as XRD, TGA, BET surface area analyser, TGA and SEM techniques. XRD studied confirmed the crystalline nature of material. The prepared material was found to be stable till 450 C from TGA study. The SEM pictures displayed uniform and discrete particles which portrays the high probable sites that maximises the catalytic activity. The optimization of microwave assisted Biodiesel synthesis from chicken feather oil through Transesterification process using the bio-synthesized catalytic material was the main aim of the study. A 500 W microwave irradiation of Chicken feather meal oil using 8:1 Methanol:Oil input, 1% Bio Nano CaO concentration, 5 min of reaction time resulted in 95% conversion of chicken feather meal oil into chicken feather meal methyl esters. The Biodiesel was showed low viscosity (4.15 mm/s), high heating value (50 MJ/kg), high flash point (153C), reasonable pour point (12 C) and good cetane number (50 min). The future works will be concentrated on the engine studies related to Torque, fuel consumption, emission data by using the synthesized Biodiesel.
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http://dx.doi.org/10.1016/j.envres.2021.112509DOI Listing
April 2022

Comparison of cracking activity of the core-shell composite MCM-41/HY & MCM-48/HY catalysts in the synthesis of organic liquid fuel from Mahua oil.

Environ Res 2022 04 1;205:112474. Epub 2021 Dec 1.

School of Renewable Energy, Maejo University, Chiang Mai, 50290, Thailand; College of Medical and Health Science, Asia University, Taichung, Taiwan. Electronic address:

A synergistic catalyst was architectured using the hydrothermal crystallization method. Mesoporous material with pore diameter less than 20 nm was grown on the microporous Zeolite HY. The catalysts were characterized by XRD, ICP-OES, BET, TPD, SEM and TEM techniques. The SEM picture portrayed excellent core - shell morphology and TEM analysis corresponded to the XRD reports. Mahua oil was cracked in a pilot scale reactor over the synthesized catalysts at an optimized reaction condition (Temperature: 400 C; WHSV: 4.6 h). The gaseous and liquid products of reaction were analyzed by Residual Gas analyzer and GCMS respectively. The NMR spectral analysis of fuel showed low traces of aromatics. The produced fuel was analyzed for its significant properties like calorific value, fire point, flash point and viscosity.
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http://dx.doi.org/10.1016/j.envres.2021.112474DOI Listing
April 2022

Combined effect of CO concentration and low-cost urea repletion/starvation in Chlorella vulgaris for ameliorating growth metrics, total and non-polar lipid accumulation and fatty acid composition.

Sci Total Environ 2022 Feb 27;808:151969. Epub 2021 Nov 27.

School of Renewable Energy, Maejo University, Chiang Mai, 50290, Thailand; College of Medical and Health Science, Asia University, Taichung, Taiwan. Electronic address:

Different CO concentration such as 0.03, 5, 10 and 15% and low-cost urea repletion/starvation in Chlorella vulgaris on growth, total and non-polar lipid content and fatty acid composition was studied. Chlorella vulgaris grown at 0.03% CO apparently revealed inferior biomass yield 0.55 g/L on 14th day compared to CO supplemented cells. In the case of CO supply, 15% CO has unveiled higher biomass yield at about 1.83 g/L on day 12 whereas biomass yield for 5 and 10% CO supplemented cells was 1.61 and 1.73 g/L, respectively on 12th day of cultivation. The biomass productivity (g) per liter per day was 32 mg in control condition whereas it was 125, 134 and 144 mg/L/d in 5, 10 and 15% CO supplied cells, respectively. Lipid content of the strain grown at control, 5, 10 and 15% CO was 21.2, 22.1, 23.4 and 24.6%, respectively and however, without CO addition in low-cost urea repleted and urea depleted medium grown cells revealed 21.2 and 24.2%, respectively. Interestingly, strain grown at 15% CO supply in urea deplete medium yielded 28.7% lipid and contribution of non-polar lipids in total lipids is 69.7%. Further, the fatty acid composition of the strain grown in 15% CO supply in urea depleted medium showed C16:0, C16:1, C18:1 and C18:3 in the level of 30.12, 9.98, 23.43, and 11.97%, respectively compared to control and urea amended condition.
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http://dx.doi.org/10.1016/j.scitotenv.2021.151969DOI Listing
February 2022

Bio-based algal (Chlorella vulgaris) refinery on de-oiled algae biomass cake: A study on biopolymer and biodiesel production.

Sci Total Environ 2022 Apr 11;816:151579. Epub 2021 Nov 11.

School of Renewable Energy, Maejo University, Chiang Mai 50290, Thailand; College of Medical and Health Science, Asia University, Taichung, Taiwan. Electronic address:

In this study, a novel bio-refinery concept was designed for efficient utilization of de-oiled algae cake as bio-resource for biopolymer (Polyhydroxyalkanoates (PHB)) production and thereby making the biorefinery process more economical and sustainable by completely utilizing the algal biomass without the production of waste algal residues. Algal oil was extracted from Chlorella vulgaris biomass via Bligh and Dyer method for biodiesel production through parabolic solar trough collector. Maximum lipid yield was 27.5 wt% at a temperature of 45 °C with de-oiled cake (DC) yield of 0.37 g. Maximum algal oil conversion efficiency was 89% and 94% for 0.3 wt% of clam shell waste and commercial calcium oxide catalyst at 90 min. After a reaction time of 120 h, the glucose, soluble sugars, xylose, and arabinose in the DC was reduced by 53%, 21%, 63%, and 69% respectively. The maximum PHB yield was 0.41 g PHB/g DC. This study provides additional support for the algal refineries on sustainability and circular usage of algae biomass for production of multiple products.
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http://dx.doi.org/10.1016/j.scitotenv.2021.151579DOI Listing
April 2022

PM emissions - assessment of combustion energy transfer with Schizochytrium sp. algal biodiesel and blends in IC engine.

Sci Total Environ 2022 Jan 19;802:149750. Epub 2021 Aug 19.

Research Center in Bioresources for Agriculture, Industry and Medicine, Chiang Mai University, Chiang Mai 50200, Thailand. Electronic address:

The continuous growing demand for fossil fuel puts an enormous pressure on finding a better replacement. This research paper explores the detailed information on the improved production, emission and performance characteristics of the distinct bio-oil derived from the micro algae of Schizochytrium. The algae were grown in the artificial seawater with enough nitrogen supply at the required standard conditions. The lipid growth and production of the bio-oil were monitored closely and measured. Different fuel blends were used at different concentrations as B0 (100% Diesel), B10 (10% schizochytrium biofuel +90% diesel), B20 (20% schizochytrium biofuel +80% diesel) and B30 (30% schizochytrium biofuel +70% diesel). A small single cylinder, four stroke diesel engine was used to conduct the tests. All tests were conducted at different speed conditions of 1200 rpm to 2100 rpm in six intervals. The performance qualities of bio-oil such as CO, NO, and smoke and CO emission along with the performance qualities of brake thermal efficiency and brake specific fuel consumption. Form the results, the Schizochytrium microalgae bio-oil as the bio fuel for diesel engines in the moderate level showed the improved performance by increasing the BTE and reducing the harmful gas emissions except NO. However, the emission level of NO was slightly higher than the diesel emitted value. The difference between them was negligible.
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http://dx.doi.org/10.1016/j.scitotenv.2021.149750DOI Listing
January 2022

Photocatalytic degradation of congo red dye using nickel-titanium dioxide nanoflakes synthesized by Mukia madrasapatna leaf extract.

Environ Res 2021 11 6;202:111647. Epub 2021 Jul 6.

School of Renewable Energy, Maejo University, Chiang Mai, 50290, Thailand; College of Medical and Health Science, Asia University, Taichung, Taiwan. Electronic address:

Semiconductor photocatalysts are efficient degraders of organic and inorganic waste water pollutants. Herein, we synthesized nickel-titanium dioxide (Ni-TiO) nanoflakes using Mukia maderaspatana leafs with the aim of analyzing their photocatalytic degradation potential. Morphological analyses revealed that the nanoflakes were highly agglomerated with an average size of 100 nm. Further, elemental analysis confirmed the presence of Ti, O, and Ni, whereas Fourier transform infrared spectroscopy and X-ray diffraction established the presence of TiO and NiO. We found that photocatalytic degradation of congo red under UV illumination increased with increasing incubation period, demonstrating that Ni-TiO nanoflakes can be used as optimal photocatalysts for the degradation of dyes in waste water.
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http://dx.doi.org/10.1016/j.envres.2021.111647DOI Listing
November 2021

Clean approach for chromium removal in aqueous environments and role of nanomaterials in bioremediation: Present research and future perspective.

Chemosphere 2021 Dec 30;284:131368. Epub 2021 Jun 30.

Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Viet Nam. Electronic address:

Chromium is an insidious ecological pollutant that is of huge value for its toxicity. The existing ecological objective to lower the heights of toxic materials in marine systems and to stimulate the existing water to recycle after suitable treatment of wastewater. Chromium is a hazard element that appears in discharges of numerous industries that must be diminished to accomplish the goals. Nearly all of the findings described in the literature related to the usage of various materials such as fungal, algal, bacterial biomass, and nanomaterials for chromium adsorption. The current work evaluates the findings of research commenced in the preceding on the use of a variety of adsorbents to decrease chromium concentrations in contaminated waters. This review article focuses on the issue of chromium contamination, its chemistry, causes, consequences, biological agent remediation techniques, and the detailed process of chromium detoxification in microbial cells. It also lists a description of the in situ and ex situ chromium bioremediation methods used. This can help design more effective Cr(VI) removal methods, thus bridging the difference between laboratory discoveries and industrial chromium remediation applications.
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http://dx.doi.org/10.1016/j.chemosphere.2021.131368DOI Listing
December 2021

A review on role of nitrous oxide nanoparticles, potential vaccine targets, drug, health care and artificial intelligence to combat COVID-19.

Appl Nanosci 2021 Jun 16:1-8. Epub 2021 Jun 16.

Institute of Research and Development, Duy Tan University, Da Nang, 550000 Viet Nam.

The lives of human individuals and groups around the globe have changed drastically due to the emergence of novel corona virus in late 2019. The significant part of CoV-19 from the global point is transmission rate, and therefore, it is mandatory to identify and isolate the affected persons even with the mild infection. To stop the rapid transmission of virus to drastic manner, it is essential to follow the hygienic practices, identification of potential vaccines and proper health care management systems to combat the novel virus. Despite the serious mortality rates and high confirmed cases, at present, there is no proven treatment and vaccine to treat the pandemic coronavirus. The current review prioritizes the recent trends in the health care sector, vaccine development pipeline and artificial intelligence role to combat CoV-2. Due to the unprecedented situation, the health care professionals was under high working stress and they were pushed to make serious decisions on time. Several health care workers pose directly threat to the occupational health risk. Besides, the industry is also experiencing a decrease in the outpatient footfalls along with the reduction of international patients. Furthermore, the services such as hypertension, diabetes, cancer and cardiovascular affected by 53%, 49%, 42% and 31%, respectively, due to the pandemic. Vaccines and treatments are the urgent need and have been extensively on progress worldwide. Despite the new technologies, the effectiveness of the old antiviral, such as Chloroquine and hydroxychloroquine, Lopinavir-Ritonavir, Nafamostat and Camostat, and Remdesiviron COVID-19, was reviewed. The reviews on different vaccinations were effective in the understanding the efficiency of drugs in reducing the symptoms of COVID-19. Although vaccination and social distancing can reduce the infection, the role of the Artificial intelligence technology will enable the highest reduction of the COVID-19 infection by reducing the time and increasing the reliability.
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http://dx.doi.org/10.1007/s13204-021-01935-zDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8205648PMC
June 2021

Assessment of hexavalent chromium (VI) biosorption competence of indigenous Aspergillus tubingensis AF3 isolated from bauxite mine tailing.

Chemosphere 2021 Nov 1;282:131055. Epub 2021 Jun 1.

Faculty of Electrical and Electronics Engineering, Ton Duc Thang, University, Ho Chi Minh City, Viet Nam. Electronic address:

The intention of this research was to find the most eminent metal tolerant and absorbing autochthonous fungal species from the waste dump of a bauxite mine. Out of the 4 (BI-1, BI-II, BI-III, and BI-IV) predominant isolates, BI-II had an excellent metal tolerance potential against most of the metals in the subsequent order: Cr(VI) (1500), Cu(II) (600), Pb(II) (500), and Zn(II) (500-1500 μg mL). BI-II had shown tolerance to Cr(VI) up to 1500 mg L. The excellent metal tolerant isolate was characterized and identified as Aspergillus tubingensis AF3 through 18S rRNA sequencing method and submitted to GenBank and received an accession number (MN901243). A. tubingensis AF3 had the efficiency to absorb Cr(VI) and Cu(II) at <70 & 46.3% respectively under the standard growth conditions. Under the optimized conditions (25 °C, pH 7.0, 0.5% of dextrose, and 12 days of incubation), A. tubingensis AF3 absorbed 74.48% of Cr(VI) in 12 days (reduction occurred as 822.3, 719.13, 296.66, and 255.2 mg L of Cr(VI) on the 3, the 6, the 9 and the 12 day, respectively). The adsorbed metal was sequestered in the mycelia of the fungus in a precipitated form; it was confirmed by Scanning Electron Microscope (SEM) and Energy Dispersive X-ray analysis (EDX) analyses. The possible biosorption mechanisms were analyzed by Fourier-Transform Infrared Spectroscopy (FTIR) analysis, the results showed the presence of N-H primary amines (1649.98 cm) and Alkanes (914.30 cm) in the cell wall of the fungus, while being treated with Cr(VI) they supported and enhanced the Cr(VI) absorption. The entire results concluded that the biomass of A. tubingensis AF3 had the potential to absorb a high concentration of Cr(VI).
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http://dx.doi.org/10.1016/j.chemosphere.2021.131055DOI Listing
November 2021

Electronic waste generation, recycling and resource recovery: Technological perspectives and trends.

J Hazard Mater 2021 08 16;416:125664. Epub 2021 Mar 16.

Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam; College of Medical and Health Science, Asia University, Taichung, Taiwan. Electronic address:

The growing population and increased disposal of end-of-life (EoL) electrical and electronic products have caused serious concerns to the environment and human health. Electronic waste (e-waste) is a growing problem because the quantity and the rate at which it is generated has increased exponentially in the last 5 years. The rapid changes or upgradation in technologies, IT requirements for working or learning from home during COVID-19, manufacturers releasing new electronic gadgets and devices that serves the consumers comfort and a declension in services has contributed to an increase in the e-waste or waste of electrical and electronic equipment (WEEE) generation rates. The current status of e-waste generation, handling procedures and regulatory directives in USA, EU, China, India, Vietnam and Gulf Cooperation Council (GCC) countries are presented in this review. The recent developments in e-waste recycling methods/recovery of base and precious metals, the advantages and limitations of hydrometallurgy, pyrometallurgy, biohydrometallurgy and pyrolysis are discussed. Considering the impediments in the present technologies, the extraction of valuable resources, i.e. precious metals, from e-waste using suitable biocatalysts shows promising applications. This review also stresses on the research needs to assess the economic effects of involving different unit operations/process industries for resource recovery, reuse and recycling.
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http://dx.doi.org/10.1016/j.jhazmat.2021.125664DOI Listing
August 2021

Novel semi-automated graphene nanosheets based pipette-tip assisted micro-solid phase extraction as eco-friendly technique for the rapid detection of emerging environmental pollutant in waters.

Chemosphere 2021 Aug 21;276:130031. Epub 2021 Feb 21.

Department of Medicinal and Applied Chemistry, College of Life Sciences, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan; Research Center for Environmental Medicine, College of Medicine, Kaohsiung Medical University (KMU), Kaohsiung City, 807, Taiwan; Department of Medical Research, Kaohsiung Medical University, Kaohsiung City, Taiwan; Department of Chemistry, National Sun Yat-sen University, Kaohsiung City, Taiwan. Electronic address:

In this work, a new semi-automated syringe infusion-pump assisted graphene nanosheets (GNSs) based pipette-tip micro-solid phase extraction (PT-μSPE) as a green sample preparation technique was demonstrated for the sensitive analysis of emerging environmental pollutant in environmental waters using HPLC-UV. Microwave-assisted synthesized GNSs powder was packed into a 100 μL pipette-tip (as PT-μSPE cartridge) connected with a commercial plastic syringe (contains water sample). This setup was attached to a programmable auto-syringe infusion pump for the GNSs-PT-μSPE process. Triclosan (TCS) is an emerging environmental pollutant chosen as a target analyte to examine the extraction capacity and feasibility of GNSs as a sorbent material for PT-μSPE. Parameters affecting the extraction capability were systematically evaluated and thoroughly optimized. At optimized experimental parameters, excellent linearity (r = 0.9979) was achieved over the concentration range of 2-250 ng mL for TCS, with a detection limit of 0.5 ng mL. Applicability of the presented method was examined with real water samples, and extraction recoveries obtained were ranged between 94.6-102.4% with RSD less than 7.8%. The presented protocol is a simple, semi-automated, eco-friendly, low-cost, and efficient sample pretreatment technique for quick analysis of TCS in environmental wastewaters.
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http://dx.doi.org/10.1016/j.chemosphere.2021.130031DOI Listing
August 2021

Lipid content, biomass density, fatty acid as selection markers for evaluating the suitability of four fast growing cyanobacterial strains for biodiesel production.

Bioresour Technol 2021 Apr 4;325:124654. Epub 2021 Jan 4.

Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Viet Nam.

Considering the glitches in making commercially realistic fuel, this research article has demonstrated the lipid accumulation in four fast growing, filamentous cyanobacterial strains. On day 26, the lipid content estimated was 6.7, 8.2, 10.2, and 9.4% from Phormidium sp. FW01, Phormidium sp. FW02, Oscillatoria sp. FW01, and Oscillatoria sp. FW02, respectively. Of the photosynthetically active radiation (PAR) tested, 2000 lx was found to higher biomass and lipid at about 1.83 g/L and 12.5%, respectively for Oscillatoria sp. FW01. Of <5 °C, 15 °C, 25 °C, 37-40 °C tested, 11.2% lipid was extracted from Oscillatoria sp. FW01 grown at 37-40 °C and pH did not make any changes in biomass and lipid content. The optimized abiotic conditions showed higher polar lipids about 75% in all the tested cyanobacteria and further, Oscillatoria sp. FW01 yielded 57% fatty acid methyl ester, which contains desirable fatty acids C 16:0, C 16:1, C18:1, C18:3 for high quality biodiesel.
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http://dx.doi.org/10.1016/j.biortech.2020.124654DOI Listing
April 2021

Impact on degradation of antibiotics from poultry litter using Autothermal Thermophilic Aerobic Digestion (ATAD).

Saudi J Biol Sci 2021 Jan 11;28(1):988-992. Epub 2020 Nov 11.

Molecular Bioremediation and Nano Biotechnology Laboratory, Department of Environmental Biotechnology, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India.

Tetracycline (TC) is one of the common antibiotics which is widely used in livestock growth promotion. The prevalent application TC may pave way to progression of antibiotic resistant bacteria. The main objective of this study is to determine the effect of Autothermal Thermophilic Aerobic Digestion (ATAD) on the fate of TC residues found in digested poultry litter. For the determination of TC in poultry litter, thin layer chromatography (TLC) and high performance liquid chromatography (HPLC) were done. TLC result revealed that the R value of standard TC on TLC plate was 0.97 which correlates with the R value of TC at 0, 12, 24 and 36 h of digested poultry litter sample and not at 48, 60 and 72 h. HPLC chromatogram revealed that the limits of detection and the recovery were 5 µg/kg and 96% for standard TC. Linear correlation curves were obtained over the series of 100-500 µg/mL with correlation coefficient of 0.996 and the calibration curve was Y = 0.001X + 0.066. These results confirmed the degradation of TC in ATAD digestion of poultry litter by abiotic processes.
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http://dx.doi.org/10.1016/j.sjbs.2020.11.023DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7783801PMC
January 2021

Performance and emission evaluation of dual fuel CI engine using preheated biogas-air mixture.

Sci Total Environ 2021 Feb 18;754:142389. Epub 2020 Sep 18.

Innovative Green Product Synthesis and Renewable Environment Development Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Viet Nam. Electronic address:

In this work, the effect of the preheated biogas-air mixture in a biogas-diesel dual fuel CI engine was evaluated. The intake biogas-air mixture was heated by engine exhaust gas using a double pipe heat exchanger. A single-cylinder, air-cooled CI engine was modified to run in dual fuel mode. The research was carried out at various biogas-air mixture intake temperatures ranging from 55 ± 5 °C to 85 ± 5 °C under different loading conditions. The obtained results were compared for the diesel mode and non-preheated biogas-diesel dual fuel mode. The results revealed that the brake power and the brake thermal efficiency were found to be 6.5% and 51.4% enhanced by raising the intake temperature compared to the non-preheated biogas-air mixture. Moreover, preheating the inlet biogas-air mixture reduced 40.5% of the brake specific biogas consumption and 7.25% of brake specific diesel consumption. On contrary, CO and NO emissions for preheated BAM increased by 12.6% and 11.73%, respectively, compared to non-preheated BAM. Preheating the inlet biogas-air mixture reduced HC and CH emissions. The preheated biogas-air mixture at 75 ± 5 °C gave the optimum performance characteristics. The promising experimental results would help to develop biogas-diesel operated dual fuel engine.
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http://dx.doi.org/10.1016/j.scitotenv.2020.142389DOI Listing
February 2021

A study on biofuel produced by catalytic cracking of mustard and castor oil using porous Hβ and AlMCM-41 catalysts.

Sci Total Environ 2021 Feb 16;757:143781. Epub 2020 Nov 16.

Innovative Green Product Synthesis and Renewable Environment Development Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Viet Nam. Electronic address:

Biofuel is the only novel solution to the increase in the greenhouse effect and bursting energy demand. The catalytic cracking of non-edible vegetable oils, namely castor and mustard was studied to yield gasoline range (C5-C9) hydrocarbons. Hβ (Microporous; pore size <2 nm) and AlMCM-41 (Mesoporous; pore size 2 nm-50 nm) materials with different Si/Al ratios were used as catalysts for cracking purposes. Characterization of these catalysts was done by X-ray diffraction, Surface area analyzer, nitrogen sorption studies, TPD and inductively coupled plasma techniques. Used mustard oil was cracked over AlMCM-41 catalysts in a fixed bed catalytic cracking unit at optimized reaction condition (400 °C, 4.6 h) obtained over Hβ. The liquid and gaseous products were analyzed using gas chromatograph (Shimadzu GC-9A). Among the mesoporous catalysts AlMCM-41 (27) was able to convert 75% of mustard oil into 48% of bioliquid and 30.4% selectivity towards BG. Pongamia, neem, castor, fresh coconut and used coconut oil was also cracked using AlMCM-41 (27) catalyst. The major products of cracking reactions were Castor Bioliquid (CBL) comprising of bio gasoline (BG), bio kerosene (BK) and bio diesel (BD) with less yield of gaseous products. AlMCM-41 converted 98% of castor oil into 85% of CBL and it was tested with ASTM 6751 standard procedures for its calorific value, viscosity and flash point. The sulphur emission from CBL run engine reached lower index. The results exhibited the commercial utility of the CBL in the near future.
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http://dx.doi.org/10.1016/j.scitotenv.2020.143781DOI Listing
February 2021

Ultrasound-assisted synthesis of mixed calcium magnesium oxide (CaMgO) nanoflakes for photocatalytic degradation of methylene blue.

J Colloid Interface Sci 2021 Feb 6;584:770-778. Epub 2020 Oct 6.

Innovative Green Product Synthesis and Renewable Environment Development Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Viet Nam. Electronic address:

In the present study, mixed calcium magnesium oxide (CaMgO) nanoflakes were synthesized using an ultrasound-assisted co-precipitation method. The physicochemical, structural and functional properties and elemental composition of the nanoflakes had been characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), High-resolution transmission electron microscopy (HR-TEM), Fourier Transform Infrared spectroscopy (FTIR), UV-VIS spectroscopy, X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. Moreover, the photocatalytic actions of the nanoflakes were evaluated by the removal rates of methylene blue (MB) and p-nitrophenol (4-NP) under UV irradiation at room temperature. SEM-EDS studies revealed that the nanoflakes consisted of mixed oxide such as magnesium oxide (MgO) and calcium oxide (CaO) particles. The size of the nanoflakes was found to be in the range of 10-30 nm and the average size was 25 nm as confirmed by HR-TEM analysis. XRD revealed that the standard crystal size was calculated to be 25 nm. The synthesized nanoflakes had a strong photocatalytic activity for methylene blue (MB) and p-nitrophenol (4-NP) degradation in the presence of HO under UV light irradiation within 60 min and 30 min, respectively. Hence, the present study proposes that the CaMgO nanoflakes can be employed for the removal of dyes from wastewater.
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http://dx.doi.org/10.1016/j.jcis.2020.09.112DOI Listing
February 2021

Chaetomium globosum extract mediated gold nanoparticle synthesis and potent anti-inflammatory activity.

Anal Biochem 2021 01 19;612:113970. Epub 2020 Sep 19.

Innovative Green Product Synthesis and Renewable Environment Development Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Viet Nam. Electronic address:

Gold nanoparticles (AuNPs) are gaining a lot of attention in recent decades from researchers due to their unique optoelectronic properties and their significance in the field of biomedicine. Keeping this in view, our research work was designed to investigate gold nanoparticles obtained by using a fungal endophytic strain Chaetomium globosum, isolated from Vitex negundo which showed significant activity on enzyme inhibition. In the present study, the fungal isolate C. globosum was characterized using HPLC and LC-MS. A novel compound Catechin was matched with standard Catechin. Further, the endophyte C. globosum extract was utilized to synthesize gold nanoparticles (CgAuNPs) which was analysed by UV-visible spectroscopy. The CgAuNPs exhibited wine red color and the absorption peak appeared at 542 nm confirming the formation of the AuNPs. Further, Fourier Transmission Infrared Spectroscopy (FTIR) was performed to confirm the various functional groups present in mycosynthesized CgAuNPs. FTIR analysis demonstrated the presence of amines, flavonoids, as well as the presence of amide I linkage which possibly reduces Au to Au. The synthesized CgAuNPs exhibited potential cytotoxicity against HeLa cells in a dose dependent manner. Further, CgAuNPs demonstrated significant anti-inflammatory activity. Overall, the present work provides insights into the design of nano delivery and may be applied for clinical studies in future.
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http://dx.doi.org/10.1016/j.ab.2020.113970DOI Listing
January 2021

Green synthesis of cobalt-oxide nanoparticle using jumbo Muscadine (Vitis rotundifolia): Characterization and photo-catalytic activity of acid Blue-74.

J Photochem Photobiol B 2020 Oct 28;211:112011. Epub 2020 Aug 28.

Innovative Green Product Synthesis and Renewable Environment Development Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Viet Nam.. Electronic address:

In the recent years, plant and microbial extract based nanoparticles (NPs) have become a sophisticated technology serving as an alternative strategy for the purpose of developing materials functionalized by structural diversity and enhanced energy efficiencies. Cobalt oxide nanoparticles (GCoO-NPs) have wide applications in several sectors due to their high resistance to corrosion as well as oxidation, ecofriendly nature, cost effectiveness and nontoxic potential. Plant based particles are credible alternatives as they reduce the burden of complicated and laborious protocols of physiochemical reliance. In this study, GCoO-NPs were synthesized using the grape Jumbo Muscadine (Vitis rotundifolia) using co-precipitation. The synthesized GCoO-NPs were characterized by UV-Vis spectrophotometer, Fourier transform infrared spectroscopy (FTIR), Powder X-ray diffraction (PXRD) and Scanning electron microscopy (SEM). The photocatalytic activity of the GCoO-NPs was estimated by the degradation of Acid Blue-74 (AB-74) dye and the complete degradation of 98% was accomplished at the reaction time of 150 min at pH 10 and 60 mg/100 mL concentration. The outcomes of this study indicated the excellent performance of the GCoO-NPs on par with some of the earlier findings and this can be an appealing aspirant of extreme potential to be employed as a catalyst alternative to the conventional wastewater treatment methods.
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http://dx.doi.org/10.1016/j.jphotobiol.2020.112011DOI Listing
October 2020

A systematic review on recent trends in transmission, diagnosis, prevention and imaging features of COVID-19.

Process Biochem 2020 Nov 20;98:233-240. Epub 2020 Aug 20.

Institute of Research and Development, Duy Tan University, Da Nang 550000, Viet Nam.

As the new cases of COVID-19 are growing every daysince January 2020, the major way to control the spread wasthrough early diagnosis. Prevention and early diagnosis are the key strategies followed by most countries. This study presents the perspective of different modes of transmission of coronavirus,especially during clinical practices and among the pediatrics. Further, the diagnostic methods and the advancement of the computerized tomography have been discussed. Droplets, aerosol, and close contact are thesignificantfactors to transfer the infection to the suspect. This study predicts the possible transmission of the virus through medical practices such as ophthalmology, dental, and endoscopy procedures. With regard to pediatric transmission, as of now, only afew child fatalities had been reported. Childrenusually respond to the respiratory virus; however, COVID-19 response ison the contrary. The possibility of getting infected is minimal for the newborn. There has been no asymptomatic spread in children until now. Moreover, breastfeedingwould not transmit COVID-19, which is encouraging hygiene news for the pediatric. In addition, the current diagnostic methods for COVID-19 including Immunoglobulin M (IgM) and Immunoglobulin G (IgG)and chest computed topography(CT) scan, reverse transcription-polymerase chain reaction (RT-PCR) andimmunochromatographic fluorescence assay, are also discussed in detail. The introduction of artificial intelligence and deep learning algorithmhas the ability to diagnose COVID-19 in precise. However, the developments of a potential technology for the identification of the infection, such as a drone with thermal screening without human intervention, need to be encouraged.
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http://dx.doi.org/10.1016/j.procbio.2020.08.016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7439988PMC
November 2020

A review on prospective production of biofuel from microalgae.

Biotechnol Rep (Amst) 2020 Sep 23;27:e00509. Epub 2020 Jul 23.

Innovative Green Product Synthesis and Renewable Environment Development Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Viet Nam.

This critical review summarizes the utilization of algae as the resilient source for biofuel. The paper validates the different stages in generation of biofuels and provides a clarity on III generation biofuels. The microalgae is focused as an incredible source and a detailed discussion has been carried out from the cultivation, extraction and conversion to the final product. An elaborate view on conversion methodologies and troubles involved in the respective techniques are presented. The efficiency of the algal fuel performing in I/C engines derived from major techniques is considered. There exist new challenging barriers in the implementation of microalgae as prospective source in the energy market. In addition, types of pyrolysis for the production of main product from microalgae had been discussed in detail. Besides, some microalgae grow easily from fresh to waste water, make it more feasible source. Although the microalgae are a best alternative, cost of production and the yield of biofuel are still challenging. Further, cultivation of microalgae is very effective by applying two stage cultivation strategies. This comprehensive review provides the useful tool to identify, innovate and operate microalgae as the potential based biofuel.
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http://dx.doi.org/10.1016/j.btre.2020.e00509DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7396912PMC
September 2020

COVID-19 and frequent use of hand sanitizers; human health and environmental hazards by exposure pathways.

Sci Total Environ 2020 Nov 27;742:140561. Epub 2020 Jun 27.

Innovative Green Product Synthesis and Renewable Environment Development Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Viet Nam. Electronic address:

Till date no medication or vaccine is available to cope with the COVID-19 infection and infection rate is increasing drastically across the globe. Only preventive measures and healthy life style with efficient immune system have been suggested by WHO to fight and stay safe from COVID-19. WHO recommended alcohol based hand sanitizers for frequent hand hygiene, which are mainly made up from ethanol, isopropyl alcohols, hydrogen peroxides in different combinations. These preparations may become toxic to human health and environment when misused. These chemicals have known toxic and hazardous impact on environment when released by evaporation. In early five months of 2020, American Association of Poison Control Center reported 9504 alcoholic hand sanitizer exposure cases in children under the age of 12 years and recognized that even a small amount of alcohol can cause alcohol poisoning in children that is responsible for confusion, vomiting and drowsiness, and in severe cases, respiratory arrest and death. Furthermore, frequent usage of said hand sanitizers has reported increased chance of antimicrobial resistance and chance of other viral diseases. Current review is designed with main objective to highlight the toxic and serious health risks to human health and environment by frequent using hand hygiene products with alcohols based formulations.
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http://dx.doi.org/10.1016/j.scitotenv.2020.140561DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7320712PMC
November 2020

Core/shell nanoparticles: Synthesis, investigation of antimicrobial potential and photocatalytic degradation of Rhodamine B.

J Photochem Photobiol B 2020 Jan 3;202:111729. Epub 2019 Dec 3.

Innovative Green Product Synthesis and Renewable Environment Development Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Viet Nam. Electronic address:

Bacterial pathogenicity is becoming a major cause of morbidity and mortality around the globe. Researchers are tirelessly finding solutions to cure or prevent infections caused by bacterial pathogens. Nanotechnology is a fast-growing area of research, effectively influencing and preventing bacterial growth. Nanoparticles (NPs) of silver, copper and gold are being used to kill bacterial pathogens in the past years but the toxicity of NPs at higher concentrations remains a major problem. Therefore, in the present study, [email protected] (CoZ) core/shell NPs were synthesized using a simple sol-gel method. The synthesized NPs were characterized using different analytical techniques revealing the absorption bands at 456 and 277 nm with crystalline size of ~600 nm core/shell. The functional groups and oxidation states were characterized using FTIR analysis. Further bactericidal properties of core/shell of [email protected] NPs were tested against Gram negative (Escherichia coli, Pseudomonas aeruginosa) and Gram positive (Staphylococcus aureus, Bacillus subitilis) pathogens. The core/shell CoZ NPs showed maximum growth inhibitions against S. aureus and P. aeruginosa. At the highest concentration of 200 μg/mL, the maximum zone of inhibition was observed. The synthesized CoZ NPs was also subjected to photocatalytic degradation of rhodamine B in 180 min under visible light irradiation. The present study could be an innovative and efficient research for both biomedical and wastewater treatment applications.
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http://dx.doi.org/10.1016/j.jphotobiol.2019.111729DOI Listing
January 2020
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