Publications by authors named "Sajad Mazloomi"

7 Publications

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Effective adsorptive removal of reactive dyes by magnetic chitosan nanoparticles: Kinetic, isothermal studies and response surface methodology.

Int J Biol Macromol 2020 Dec 8;164:344-355. Epub 2020 Jul 8.

Department of Environmental Health Engineering, School of Health, Jiroft University of Medical Sciences, Jiroft, Iran. Electronic address:

In the present study, magnetic chitosan (MC) was synthesized, characterized, and used as an efficient adsorbent for the removal of Reactive Red 141 (RR-141) and Reactive Yellow 14 (RY-14) dyes. Synthesized magnetic chitosan nanoparticles were used for characterization with the help of scanning electron microscope (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR), and X-ray diffraction (XRD) and vibrating sample magnetometer (VSM). The effect of the pH, concentration of pollutants, and adsorbent dosage on the amount of adsorption was studied. Under optimum conditions, the removal rate of RR-141 and RY-14 was 99.5 and 92.7%, respectively. The maximum adsorption capacities were obtained 98.8 and 89.7 mg/g for the RR141 and RY-14, respectively. The results from isotherm models showed that the adsorption of dyes on magnetic chitosan nanocomposite correlated well with Freundlich model, whereas the kinetics studies revealed that the adsorption process was fitted by pseudo-first-order for both dyes. Results of the reusability tests confirmed the magnetic chitosan (MC) nanoparticles could be used for several times. Based on the experimental results obtained, the MC has adequate potential for the treatment of water contaminated with anionic dyes.
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http://dx.doi.org/10.1016/j.ijbiomac.2020.07.042DOI Listing
December 2020

Removal of from aqueous solutions by a cationic surfactant modified montmorillonite.

MethodsX 2019 10;6:1967-1973. Epub 2019 Sep 10.

Department of Analytical Chemistry, Islamic Azad University, Ilam, Iran.

Nowadays, antibiotics have been found in the effluents of many pharmaceutical industries and hospitals, sanitary sewage, surface water and groundwater. The purpose of this study was to investigate the possibility of using Hexadecyl Trimethyl Ammonium Bromide modified montmorillonite (HDTMA-Mt) as an inexpensive and suitable adsorbent for the removal of from aqueous solutions. The experiments were conducted in a batch system. The effects of different variables including surfactant loading onto the clay, solution pH, contact time, adsorbate concentration and temperature were investigated on the removal of . Surface properties of the clay were evaluated using X-ray diffraction (XRD) and Fourier-transform infrared (FTIR) techniques. Various isotherms (Langmuir and Freundlich) and kinetics (pseudo-first order, pseudo-second order and intraparticle diffusion models) of adsorption were studied for the data evaluation. The findings indicated that the sorption capacity of the modified clay was found to be 88.5 mg/g over 60 min contact time at pH 9. The pseudo-second kinetic (R = 0.999) and Freundlich isotherm (R = 0.915) models best fitted the experimental data of by the adsorbent. The negative values of ΔG at higher temperature and positive value of ΔH showed the endothermic and spontaneously sorption of the drug by the clay. It can be concluded that the modified clay can be considered as a cheap and eco-friendly sorbent for the removal of from water and wastewater.
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http://dx.doi.org/10.1016/j.mex.2019.08.019DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6812345PMC
September 2019

Evaluation of phosphate removal from aqueous solution using metal organic framework; isotherm, kinetic and thermodynamic study.

J Environ Health Sci Eng 2019 Jun 28;17(1):209-218. Epub 2019 Jan 28.

4Social Determinants of Health Research Center, Mashhad University of Medical Sciences, Khorasan Razavi Province, Iran, P.O. Box: 91735-951, Mashhad, IR Iran.

Background: Phosphate (PO) is the main etiological factor of eutrophication in surface waters. Metal organic frameworks (MOFs) are novel hybrid materials with amazing structural properties that make them a prominent material for adsorption.

Methods: Zeolitic imidazolate framework 67 (ZIF-67), a water stable member of MOFs, with a truncated rhombic dodecahedron crystalline structure was synthesized in aqueous environment at room temperature and then characterized using XRD and SEM. PO adsorption from synthetic solutions using ZIF-67 in batch mode were evaluated and a polynomial model (R: 0.99, R: 0.98, LOF: 0.1433) developed using response surface methodology (RSM).

Results: The highest PO removal (99.2%) after model optimization obtained when ZIF-67 dose, pH and mixing time adjusted to 6.82, 832.4 mg/L and 39.95 min, respectively. The optimum PO concentration in which highest PO removal and lowest adsorbent utilization occurs, observed at 30 mg/L. PO removal eclipsed significantly in the presence of carbonate. The equilibrium and kinetic models showed that PO adsorbed in monolayer (q: 92.43 mg/g) and the sorption process controlled in the sorption stage. Adsorption was also more favorable at higher PO concentration, according to the separation factor (K) graph. Thermodynamic parameters (minus signs of ∆G°, ∆H° of 0.179 KJ/mol and ∆S° of 44.91 KJ/mol.K) demonstrate the spontaneous, endothermic and physisorption nature of the process.

Conclusion: High adsorption capacity and adsorption rates, make ZIF-67 a promising adsorbent for PO removal from aqueous environment.
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http://dx.doi.org/10.1007/s40201-019-00341-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6582016PMC
June 2019

Analysis of quality and quantity of health-care wastes in clinical laboratories: a case study of Ilam city.

Environ Monit Assess 2019 Mar 7;191(4):207. Epub 2019 Mar 7.

Department of Environmental Health Engineering, Social Determinants of Health Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.

Generation of health-care wastes is one of the major concerns in health-care institutions worldwide due to direct and indirect impact on human health and environment. The purpose of the present work was to estimate the quantity and quality of clinical laboratory wastes in the city of Ilam, Iran. In this cross-sectional study, randomly eight clinical laboratories including five in private sector and three governmental clinical laboratories were selected for sampling according to the purpose of the study. The results showed that the total amount of waste generation was 27,700.90 kg/year. The average amount of health-care wastes generation in Ilam city was 0.2 kg/person/year. The portions of general, pathologic, sharp, infectious, and pharmaceutical and chemical wastes were 37, 5, 2, and 56% (by weight), respectively. As a considerable amount of waste is generated in clinical laboratories of Ilam city, therefore, it is necessary to implement integrated plans for the proper management of these wastes. Thus, sufficient training and education programs must be developed for all clinical staffs and that the existing training and education procedures should also be promoted.
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http://dx.doi.org/10.1007/s10661-019-7345-zDOI Listing
March 2019

Data on the removal of turbidity from aqueous solutions using polyaluminum chloride.

Data Brief 2018 Oct 15;20:371-374. Epub 2018 Aug 15.

Department of Environmental Health Engineering, Social Determinants of Health Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.

Polyaluminum chloride (PAC) is claimed to be superior to conventional coagulants because of higher removal of particulate and/or organic matters as well as inherent advantages of lower alkalinity consumption and lesser sludge production. 1000 mL of the reaction mixture was examined using parameters, including PAC dose (5-10 mg/L), pH (4-9), and turbidity (1.9 NTU). The content was stirred at 120 rpm for 1 min. Thereafter, the turbidity of water samples was measured using a P2100 turbidimeter. Data indicated that the maximum removal efficiency of turbidity (97.74%) obtained under the PAC doses of 4 and 10, and the pH of 8. There is not a significant relationship between the different dosages of PAC (-value > 0.05), but the influence of pH on the removal of turbidity was significant (-value < 0.05). Based on the dataset, the removal efficiency of turbidity was depended on PAC and pH.
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http://dx.doi.org/10.1016/j.dib.2018.08.024DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6117952PMC
October 2018

Food Safety Knowledge and Practices of Male Adolescents in West of Iran.

Open Access Maced J Med Sci 2018 May 12;6(5):908-912. Epub 2018 May 12.

Department of Public Health, School of Health, Ilam University of Medical Sciences, Ilam, Iran.

Background: Every year many people around the world become infected with food-borne infections. Insufficient knowledge and skills related to food safety and hygiene are among the factors affecting the incidence of food-borne diseases, especially in adolescents.

Aim: The purpose of this study was to determine the knowledge and practices associated with food safety and hygiene in Ilam city male adolescents.

Material And Methods: Three hundred and eighty of male adolescents aged 13 to 19 were selected randomly and entered the cross-sectional study. Data were collected using a researcher-made questionnaire From December 2016 to February 2017. Descriptive statistics, Pearson correlation, independent t-test and one-way ANOVA were used to analyse the data in SPSS software (version 19.0).

Results: The findings of the study showed a positive and significant relationship between knowledge and practices related to food safety and hygiene (r = 0.122; p = 0.018). Also, the findings showed that food safety knowledge and practice of adolescents were significantly affected by the level of their education, parental education level, parental employment status and household economic conditions, (p < 0.005). Also, the results showed that the participants generally obtained 57.74% of the knowledge score and 57.63% of practices score. The subjects had the most knowledge about food supply and storage (60%), and the highest practice was related to personal and environmental hygiene, (61.73%).

Conclusion: The inadequacy of knowledge and performance of adolescents about food safety and hygiene shows the need for implementation of health education interventions in this area.
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http://dx.doi.org/10.3889/oamjms.2018.175DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5985871PMC
May 2018

Application of response surface methodology for optimization of natural organic matter degradation by UV/H2O2 advanced oxidation process.

J Environ Health Sci Eng 2014 15;12:67. Epub 2014 Apr 15.

Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran ; Center for Solid Waste Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran ; National Institute of Health Research, Tehran University of Medical Sciences, Tehran, Iran.

Background: In this research, the removal of natural organic matter from aqueous solutions using advanced oxidation processes (UV/H2O2) was evaluated. Therefore, the response surface methodology and Box-Behnken design matrix were employed to design the experiments and to determine the optimal conditions. The effects of various parameters such as initial concentration of H2O2 (100-180 mg/L), pH (3-11), time (10-30 min) and initial total organic carbon (TOC) concentration (4-10 mg/L) were studied.

Results: Analysis of variance (ANOVA), revealed a good agreement between experimental data and proposed quadratic polynomial model (R(2) = 0.98). Experimental results showed that with increasing H2O2 concentration, time and decreasing in initial TOC concentration, TOC removal efficiency was increased. Neutral and nearly acidic pH values also improved the TOC removal. Accordingly, the TOC removal efficiency of 78.02% in terms of the independent variables including H2O2 concentration (100 mg/L), pH (6.12), time (22.42 min) and initial TOC concentration (4 mg/L) were optimized. Further confirmation tests under optimal conditions showed a 76.50% of TOC removal and confirmed that the model is accordance with the experiments. In addition TOC removal for natural water based on response surface methodology optimum condition was 62.15%.

Conclusions: This study showed that response surface methodology based on Box-Behnken method is a useful tool for optimizing the operating parameters for TOC removal using UV/H2O2 process.
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http://dx.doi.org/10.1186/2052-336X-12-67DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3999503PMC
August 2014