8,128 results match your criteria hydroxide solution

Convenient and large-scale fabrication of cost-effective superhydrophobic aluminum alloy surface with excellent reparability.

Langmuir 2021 Jun 15. Epub 2021 Jun 15.

School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China.

Superhydrophobic surfaces are widely used in industry and daily life, yet their practical application is limited by their complicated preparation process, high cost, and poor repairability. We propose a low-cost, facile process for preparing superhydrophobic surfaces to address this limitation. Through a simple three-step spraying process, the rough structure was first constructed on the aluminum alloy, and upon modification by modifier, the superhydrophobic aluminum alloy surface was successfully prepared. Read More

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Hydrophobic-modified metal-hydroxide nanoflocculants enable one-step removal of multi-contaminants for drinking water production.

iScience 2021 May 30;24(5):102491. Epub 2021 Apr 30.

Department of Civil and Environmental Engineering, Imperial College London, London, SW7 2AZ, UK.

Flocculation is a mainstream technology for the provision of safe drinking water but is limited due to the ineffectiveness of conventional flocculants in removing trace low-molecular-weight emerging contaminants. We described a synthesis strategy for the development of high-performance nanoflocculants (hydrophobic-organic-chain-modified metal hydroxides [HOC-M]), imitating surfactant-assembling nano-micelles, by integration of long hydrophobic chains with traditional inorganic metal (Fe/Al/Ti)-based flocculants. The core-shell nanostructure was highly stable in acidic stock solution and transformed to meso-scale coagulation nuclei in real surface water. Read More

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Prevalence of in Patients with Suspected scabies

Turkiye Parazitol Derg 2021 06;45(2):133-136

Fırat Üniversitesi Tıp Fakültesi, Mikrobiyoloji Anabilim Dalı, Elazığ, Türkiye

Objective: Scabies is caused by an ectoparasite called (), which penetrates the epidermis through skin folds and burrows in the stratum corneum, following the development of tunnels (sillion). The disease is specifically characterised by keratosis, allergy and itching that increases at night-time. This study aimed to investigate the frequency of in patients with a pro-diagnosis of scabies. Read More

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Determination of selenite and selenomethionine in kefir grains by reversed-phase high-performance liquid chromatography - inductively coupled plasma-optical emission spectrometry.

J Sep Sci 2021 Jun 8. Epub 2021 Jun 8.

Yıldız Technical University, Faculty of Art and Science, Department of Chemistry, 34220 Davutpasa, Esenler, İstanbul, Turkey.

A new and efficient reversed-phase high-performance liquid chromatography - inductively coupled plasma - optical emission spectrometry method was developed for the simultaneous separation and determination of SeO and seleno-DL-methionine in kefir grains. For the system, LOD/LOQ values for SeO and seleno-DL-methionine were calculated as 0.52/1. Read More

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Competitive adsorption of pollutants from anodizing wastewaters to promote water reuse.

J Environ Manage 2021 Jun 4;293:112877. Epub 2021 Jun 4.

Laboratory for Research on Advanced Processes for Water Treatment, Engineering Institute, Campus Juriquilla, Universidad Nacional Autónoma de México (UNAM), Blvd. Juriquilla 3001, 76230, Querétaro, Mexico.

Anodizing wastewater contains principally phosphate (PO) anions according to previous studies, but with the purpose to promote water reuse in this type of industry, a complete characterization of wastewater was made to remove other anions and cations also present in significant concentration. Particularly, the adsorption of sodium (Na), potassium (K), fluoride (F), sulfate (SO) and phosphate (PO) was studied using different sorbents such as: coconut shell activated carbon, bone char, bituminous coal activated carbon, natural zeolite, silica, anionic and cationic exchange resins, a coated manganese-calcium zeolite, coconut shell activated carbon containing iron and iron hydroxide. All sorbents were characterized using FT-IR spectroscopy, potentiometric titration, nitrogen adsorption isotherms at 77 K, X-ray diffraction and SEM/EDX analysis to study the adsorption mechanism. Read More

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In situ growth of copper-based metal-organic framework on a helical shape copper wire as a sorbent in stir-bar sorptive extraction of fenthion followed by corona discharge ion mobility spectrometry.

J Chromatogr A 2021 May 24;1651:462279. Epub 2021 May 24.

Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran.

In this paper, a helical copper wire, coated with copper-benzene-1,4-dicarboxylic acid metal-organic framework (Cu-BDC) was used as a sorbent for stir-bar sorptive extraction of fenthion from water and fruit samples. The homogenous coating was fabricated through two simple and fast steps. The chemical conversion of copper substrate to copper hydroxide nanotubes (Cu(OH) NTs) was performed in an alkaline solution and then Cu-BDC was formed through a neutralization reaction. Read More

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Potassium hydroxide-modified algae-based biochar for the removal of sulfamethoxazole: Sorption performance and mechanisms.

J Environ Manage 2021 Jun 2;293:112912. Epub 2021 Jun 2.

Co-Innovation Center for the Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing, 210037, PR China; National Positioning Observation Station of Hung-tse Lake Wetland Ecosystem in Jiangsu Province, Huaian, Jiangsu, 223100, PR China. Electronic address:

Biochar has been deemed one of the most promising sorbents for the removal of organic pollutants from aqueous solution. In this study, potassium hydroxide-modified Enteromorpha prolifera biochars (PEBCs) were prepared for the first time and applied for efficient sorption of a typical antibiotic, sulfamethoxazole (SMX). The characteristics of PEBCs, including morphology, pore structure, graphitization degree, surface functional groups, and surface element composition, were investigated. Read More

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NaOH-Intercalated Iron Chalcogenides (NaOH)FeX (X = Se, S): Ion-Exchange Synthesis and Physical Properties.

Inorg Chem 2021 Jun 4. Epub 2021 Jun 4.

School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, P. R. China.

The discovery of the (LiFeOH)FeSe superconductor has aroused significant interest in metal hydroxide-intercalated iron chalcogenides. However, all efforts made to intercalate NaOH between FeSe and FeS layers have failed so far. Here we report two NaOH-intercalated iron chalcogenides (NaOH)FeX (X = Se, S) that were synthesized by a low-temperature hydrothermal ion-exchange method. Read More

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Exenatide Microspheres for Monthly Controlled-Release Aided by Magnesium Hydroxide.

Pharmaceutics 2021 May 30;13(6). Epub 2021 May 30.

School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.

GLP-1 receptor agonists are a class of diabetes medicines offering self-regulating glycemic efficacy and may best be administrated in long-acting forms. Among GLP-1 receptor agonists, exenatide is the one requiring the least dose so that controlled-release poly(d, l-lactic-co-glycolic acid) (PLGA) microspheres may best achieve this purpose. Based on this consideration, the present study extended the injection interval of exenatide microspheres from one week of the current dosage form to four weeks by simply blending Mg(OH) powder within the matrix of PLGA microspheres. Read More

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Effects of Functionalization in Different Conditions and Ball Milling on the Dispersion and Thermal and Electrical Conductivity of MWCNTs in Aqueous Solution.

Nanomaterials (Basel) 2021 May 18;11(5). Epub 2021 May 18.

German Engineering Research and Development Center LSTME Busan Branch, Busan 46742, Korea.

In this work, the effects of a functionalization method involving different conditions and milling processes on the dispersion and thermal and electrical conductivity of multiwalled carbon nanotubes were studied. The surfaces of MWCNTs were modified using a mixture of sulfuric and nitric acid as an acid treatment and potassium persulfate and sodium hydroxide as an alkaline treatment to achieve more hydrophilic MWCNTs. The morphological and structural investigations were carried out using transmission electron microscopy and Fourier transform infrared spectroscopy. Read More

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The effect of intracanal medication variations on microhardness of simulated immature root dentin.

Aust Endod J 2021 Jun 1. Epub 2021 Jun 1.

Department of Endodontics, Faculity of Dentisry, Hacettepe University, Altındağ/Ankara, Turkey.

The effect of different medicaments and irrigation solutions on root dentin microhardness (MH) was evaluated depending on time. After initial measurements, MH of 60 maxillary incisors (n = 15 per group) was measured after 3 steps: irrigation with 2.5% sodium hypochlorite, exposure to medicaments [triple antibiotic (TAP) or calcium hydroxide (CH) pastes, 1 week or 1 month)] and final irrigation [20 mL of 17% EDTA or 20 mL 1% phytic acid (PA)]. Read More

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Tuning Ni-MoO Catalyst-Ionomer and Electrolyte Interaction for Water Electrolyzers with Anion Exchange Membranes.

ACS Appl Energy Mater 2021 Apr 23;4(4):3327-3340. Epub 2021 Mar 23.

Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491, Trondheim, Norway.

Tailoring catalyst-ionomer and electrolyte interaction is crucial for the development of anion exchange membrane (AEM) water electrolysis. In this work, the interaction of Ni-MoO nanosheets with ionomers and electrolyte cations was investigated. The activity of Ni-MoO nanosheets for the hydrogen evolution reaction (HER) increased when tested in 1 M NaOH compared to 1 M KOH; however, it decreased when tested in 0. Read More

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Antibacterial effect of silver nanoparticles mixed with calcium hydroxide or chlorhexidine on multispecies biofilms.

Odontology 2021 May 28. Epub 2021 May 28.

Department of Microbiology, Faculty of Medicine, Suleyman Demirel University, Isparta, Turkey.

The purpose is to evaluate the antibacterial effects of the silver nanoparticles (AgNPs) (Nanografi, METU Teknokent, Ankara, Turkey) mixed with calcium hydroxide (Ca(OH)) (Ultracal XS, Ultradent, St Louis, US) or chlorhexidine gel (CHX) (Gluco-Chex, Cerkamed, Stalowa Wola, Poland) against a multispecies biofilm, by confocal laser scanning microscopy (CLSM) and culture-based analysis. Dentine blocks were inoculated with Enterococcus faecalis, Streptococcus mutans, Lactobacillus acidophilus and Actinomyces naeslundii for 1 week. Infected dentine blocks were randomly divided into groups according to medication; saline solution (SS), Ca(OH), Ca(OH) + AgNP, 2%CHX gel and 2%CHX gel + AgNP and time of application: 1 and 7 days (all groups, n = 5). Read More

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Measurement of Copper ion Extrusion from the Apex of Human Teeth with Single Canals Following of Electrophoresis.

Eur Endod J 2021 May 5. Epub 2021 May 5.

Department of Endodontics, Dental School, Iran University of Medical Sciences, Tehran, Iran.

Objective: Preventing bacterial overgrowth is an essential component of successful root canal treatment. Increasing the penetration of antimicrobial substances into the canal through electrophoresis is one of the possible methods. This study aimed to measure the copper ions extruding from the root apex after using an electrophoresis device (Depotphorese®) in human teeth with single canals. Read More

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Pore-structure regulation of biomass-derived carbon materials for an enhanced supercapacitor performance.

Nanoscale 2021 Jun 27;13(22):10051-10060. Epub 2021 May 27.

School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453007, P.R. China.

Herein, we report a dual-porogen synthesis strategy to fabricate a micro-/meso-/macroporous carbon material for supercapacitors from biomass. The hierarchically porous carbon material was produced in a facile way by pyrolyzing CHNNaO/KOH (dual-porogen) and walnut peel (biomass carbon source) along with HCl solution etching. Such an admirable dual-porogen strategy opened up the closed pores and broadened the range of pore distribution for the carbon material from 0. Read More

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Electrodeposition of atmosphere-sensitive ternary sodium transition metal oxide films for sodium-based electrochemical energy storage.

Proc Natl Acad Sci U S A 2021 Jun;118(22)

Department of Materials Science and Engineering, University of Illinois Urbana-Champaign, Urbana, IL 61801;

We introduce an intermediate-temperature (350 °C) dry molten sodium hydroxide-mediated binder-free electrodeposition process to grow the previously electrochemically inaccessible air- and moisture-sensitive layered sodium transition metal oxides, NaMO (M = Co, Mn, Ni, Fe), in both thin and thick film form, compounds which are conventionally synthesized in powder form by solid-state reactions at temperatures ≥700 °C. As a key motivation for this work, several of these oxides are of interest as cathode materials for emerging sodium-ion-based electrochemical energy storage systems. Despite the low synthesis temperature and short reaction times, our electrodeposited oxides retain the key structural and electrochemical performance observed in high-temperature bulk synthesized materials. Read More

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Hydrolysis and Chlorination of 2,6-Dichloro-1,4-benzoquinone under conditions typical of drinking water distribution systems.

Water Res 2021 May 9;200:117219. Epub 2021 May 9.

Department of Civil and Environmental Engineering, University of Massachusetts, Amherst 01003, United States.

Halobenzoquinones (HBQs) are emerging disinfection by-products (DBPs) that are postulated drivers of bladder carcinogenicity. Prior assessments of 2,6-dichloro-1,4-benzoquinone (DCBQ) occurrence in drinking water distribution systems have revealed a gradual decline with increasing distance from points of entry. While this signals a degradation pathway, there is limited quantitative data on rate of that degradation. Read More

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Oxygen-Rich Polymer Polyethylene Glycol-Functionalized Single-Walled Carbon Nanotubes Toward Air-Stable n-Type Thermoelectric Materials.

ACS Appl Mater Interfaces 2021 Jun 25;13(22):26482-26489. Epub 2021 May 25.

College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.

It is crucial for thermoelectric (TE) devices to obtain both p-type and n-type materials and control charge carrier density. However, n-type thermoelectric materials are quite deficient and have lower thermoelectric properties. We report one oxygen-rich polymer named polyethylene glycol (PEG) for converting p-type single-walled carbon nanotubes (SWCNTs) to air-stable n-type thermoelectric materials. Read More

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Preparation and characterization of activated carbon from hydrochar by hydrothermal carbonization of chickpea stem: an application in methylene blue removal by RSM optimization.

Int J Phytoremediation 2021 May 23:1-13. Epub 2021 May 23.

Department of Chemical Engineering, Siirt University, Siirt, Turkey.

Herein, mesoporous activated carbon (AC) was prepared through potassium hydroxide (KOH) activation of hydrochar derived from the hydrothermal carbonization (HTC) of chickpea stem (CS), and successfully applied to remove methylene blue (MB) dye from aqueous solutions in a batch system. The HTC-CSAC was prepared depending on different impregnation ratios (hydrochar:KOH, 50-150%), impregnation times (12-48 h), activation temperatures (400-600) and activation times (30-60 min). To define HTC-CSAC, various analytical techniques such as iodine adsorption number (IAN), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) were used. Read More

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Electrochemical Anion-Exchanged synthesis of porous Ni/Co hydroxide nanosheets for Ultrahigh-Capacitance supercapacitors.

J Colloid Interface Sci 2021 May 12;600:256-263. Epub 2021 May 12.

School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China. Electronic address:

The commonly reported calcination strategy usually requires high temperature to crack the metal-organic frameworks (MOFs) particles, which often lead to uncontrollable growth of nanomaterials. Here, for the first time, we utilize an electrochemical anion-exchanged method to control the hydrolysis of MOFs and synthesize porous Ni/Co hydroxide nanosheets. After the electrochemical anion-exchange, the organic ligands of MOFs nanosheets can be recycled and reused. Read More

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Adsorptive reduction of water hardness by a highly porous and regenerative geopolymer fabricated from coal fly ash waste with low-temperature calcination.

Environ Sci Pollut Res Int 2021 May 20. Epub 2021 May 20.

Global Engineering Course for Development, Environment, and Society, Tokyo Institute of Technology, G5-601, Suzukake, 4259, Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan.

In this research paper, potassium-activated geopolymer cubes (GeoC) fabricated from waste coal fly ash with low-temperature calcination were investigated as a water softening agent. The GeoC reduced water hardness contents by adsorbing calcium (Ca) and magnesium (Mg) ions from aqueous solutions. Batch experiments were conducted to investigate the adsorption performance for Ca and Mg, including contact time, initial concentration of cations, and interference with competitive cations. Read More

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Anionic surfactant assisted copper hydroxide for toxic dye removal from wastewater.

Environ Res 2021 Aug 14;199:111310. Epub 2021 May 14.

Faculty of Engineering and Science, Western Norway University of Applied Sciences, Bergen, 5063, Norway.

Wastewater treatment is the most important criteria that will deliberately reduce the water scarcity and to remove the organic pollutants from water. In this study, pure copper hydroxide (Cu(OH)), 1% sodium dodecyl sulphate (SDS) and 2% sodium dodecyl sulphate (SDS) assisted Cu(OH) was prepared through co-precipitation technique. The prepared samples was investigated employing standard characterization studies. Read More

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Cutaneous candidiasis caused by .

Pan Afr Med J 2021 16;38:178. Epub 2021 Feb 16.

Department of Dermatology and Venereology, Faculty of Medicine, Hasanuddin University, Makassar, South Sulawesi, Indonesia.

Candidiasis is an acute or subacute fungal infection caused by fungi that belongs to candida genus, with Candida albicansbeing the most frequent causative agent. Candida kefyr is a rare cause of candidiasis which has been reported in systemic candidiasis and deep infections. However, to date, it has never been reported as a cause in dermatophytosis. Read More

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Ammonia nitrogen removal from coking wastewater and high quality gypsum recovery by struvite recycling by using calcium hydroxide as decomposer.

J Environ Manage 2021 Aug 12;292:112712. Epub 2021 May 12.

School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, China.

This study deals with the highly significant and cost-effective pretreatment of the high concentration of the Total Ammonia Nitrogen (TAN) in coking wastewater to improve the biodegradability. Struvite crystallization is a promising process for TAN removal, but the high operating cost hinders its application. To solve this problem, a novel struvite recycling process was proposed for pre-treating TAN present in the coking wastewater, within which struvite was decomposed in the solid-liquid system using Ca(OH) as the decomposer. Read More

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Electrochemical sensing for naphthol isomers based on the in situ growth of zeolitic imidazole framework-67 on ultrathin CoAl layered double hydroxide nanosheets by a reaction-diffusion technique.

J Colloid Interface Sci 2021 Oct 4;599:762-772. Epub 2021 May 4.

Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science (Ministry of Education), State Key Laboratory Base of Eco-chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China. Electronic address:

It is established that ultrathin layered double hydroxide nanosheets (LDHNS) and zeolitic imidazole frameworks (ZIF) are desirable electrochemical sensing modifiers owing to their large surface area and abundant catalytic sites. Integration of them is thus an effective solution to maximize their electrocatalytic activity. Herein, a novel reaction-diffusion framework (RDF) technique is applied for the in situ growth of ZIF-67 on ultrathin CoAl-LDHNS ([email protected]). Read More

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October 2021

Alkali-induced Transformation of Ni-MOF into Ni(OH) Nanostructured Flowers for Efficient Electrocatalytic Methanol Oxidation Reaction.

Chemistry 2021 May 12. Epub 2021 May 12.

State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi'an, 710072, P. R. China.

Post treatment of metal-organic frameworks (MOFs) is widely employed to develop efficient electrocatalysts with better catalytic properties. But the complex processes of post treatment generally led to the collapse of the original structures of MOFs, making the preservation of their pristine hierarchical porous structure a great challenge. Herein, we propose the strategy of alkali treatment of Ni-MOF to transform it into Ni(OH) with similar morphology and enhanced electrocatalytic properties for methanol oxidation reaction (MOR). Read More

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Upshot of Concentration of Zirconium (IV) Oxynitrate Hexa Hydrate on Preparation and Analyses of Zirconium Oxide (ZrO₂) Nanoparticles by Modified Co-Precipitation Method.

J Nanosci Nanotechnol 2021 11;21(11):5707-5713

#120, Energy Materials Lab, Department of Physics, Science Block, Alagappa University, Karaikudi 630003 Tamil Nadu, India.

In the present work, pure nanocrystalline monoclinic Zirconia (ZrO₂) has been successfully synthesized and optimized by the modified co-precipitation method. The concentration of raw material has been optimized with the fixed amount of precipitation agent (Potassium hydroxide KOH). The thermal history of the precursor has been examined through TG/DTA analysis. Read More

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November 2021

Molten Salt Synthesized MgNiO₂ Micro/Nano-Particles for High Energy Density Supercapacitor and Electrocatalyst for Hydrogen Evolution Reaction in Alkaline Medium.

J Nanosci Nanotechnol 2021 Nov;21(11):5556-5568

School of Nano-Science and Technology, Indian Institute of Technology Kharagpur, 721302, West Bengal, India.

In recent years, solid solutions have shown promising results as functional materials for different applications. These materials have tunable physiochemical properties and electronic properties, and are being intensively studied for next generation electrochemical charge storage as well as noble metal free low cost electrocatalyts. In the present work, Magnesium Nickel Oxide (MgNiO₂) solid solution is prepared by molten salt synthesis. Read More

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November 2021

Multiple heavy metals immobilization based on microbially induced carbonate precipitation by ureolytic bacteria and the precipitation patterns exploration.

Chemosphere 2021 Jul 18;274:129661. Epub 2021 Jan 18.

Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610065, Sichuan, PR China. Electronic address:

Biomineralization to immobilize the toxic metal has great potential for the bioremediation of multiple heavy metal contamination. In this study, the efficiency of Microbially Carbonate Induced Precipitation (MICP) for several common heavy metals (Cu, Zn, Ni, Cd) in mining areas as well as their precipitation patterns were researched. After urease activity and precipitation ability comparison, Sporosarcina kp-4 and kp-22 were selected for subsequent studies. Read More

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Sonochemically prepared hierarchical MFI-type zeolites as active catalysts for catalytic ethanol dehydration.

Ultrason Sonochem 2021 Jun 3;74:105581. Epub 2021 May 3.

Faculty of Chemical Engineering and Technology, Cracow University of Technology, Warszawska 24, 31-155 Cracow, Poland.

In this paper, the ultrasonic-assisted desilication technique was reported as an attractive and efficient way for the preparation of hierarchical zeolites with MFI structure type. The prepared materials were used as active catalysts for the dehydration of ethanol into diethyl ether and ethylene. For all catalysts, the selectivity to diethyl ether was ca 95% or higher up to 210 °C, with catalytic activity in the range of 40-68%. Read More

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