Evaluating the performance of modified adsorbent of zero valent iron nanoparticles – Chitosan composite for arsenate removal from aqueous solutions
Background and Objective: Arsenic is one of the most toxic pollutants in groundwater and surface water. Arsenic could have lots of adverse impacts on human health. Therefore, access to new technologies is required to achieve the arsenic standard. Materials and Methods: The present study was conduct...
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doaj-06eea825ab8648d0b2ff1775883137362021-09-02T07:26:14ZfasTehran University of Medical Sciencesسلامت و محیط2008-20292008-37182016-03-0184535548Evaluating the performance of modified adsorbent of zero valent iron nanoparticles – Chitosan composite for arsenate removal from aqueous solutionsK Yaghmaeian0N Jaafarzadeh1R Nabizadeh2H Rasoulzadeh3B Akbarpour4 Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Department of Environmental Health Engineering, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Background and Objective: Arsenic is one of the most toxic pollutants in groundwater and surface water. Arsenic could have lots of adverse impacts on human health. Therefore, access to new technologies is required to achieve the arsenic standard. Materials and Methods: The present study was conducted at laboratory scale in non-continuous batches. The adsorbent of zero-valent iron nanoparticles -Chitosan was produced through reducing ferric iron by sodium borohydride (NaBH4) in the presence of chitosan as a stabilizer. At first, the effect of various parameters such as contact time (5-120 min), pH (3-10), adsorbent dose (0.3-3.5 g/L) and initial concentration of arsenate (2-10 mg/L) were investigated on process efficiency. Then optimum conditions in terms of contact time, pH, adsorbent dose and initial concentration of arsenate were determined by RSM method. Freundlich and Langmuir isotherm model equilibrium constant, pseudo-first and second order kinetic constants were calculated. The residual arsenate was measured y using ICP-AES. Results: The optimum values based on RSM for pH, absorbent dose, contact time, and initial concentration of arsenate were 7.16, 3.04 g/L, 91.48 min, and 9.71 mg/L respectively. Langmuir isotherm with R2= 0.9904 for Arsenate was the best graph for the experimental data. According to Langmuir isotherm model, the maximum amount of arsenate adsorption was 135.14mg/g. . The investigation of arsenate adsorption kinetics showed that arsenate adsorption follows the pseudo-second kinetics model. Conclusion: This research showed that the adsorption process is depended on pH. With increasing pH, the ability of amine groups in chitosan are decreased to protonation, caused to decrease the efficiency of arsenate removal at high pH.http://ijhe.tums.ac.ir/browse.php?a_code=A-10-542-1&slc_lang=en&sid=1Adsorption Arsenate Chitosan Modified zero valent iron nanoparticles |
collection |
DOAJ |
language |
fas |
format |
Article |
sources |
DOAJ |
author |
K Yaghmaeian N Jaafarzadeh R Nabizadeh H Rasoulzadeh B Akbarpour |
spellingShingle |
K Yaghmaeian N Jaafarzadeh R Nabizadeh H Rasoulzadeh B Akbarpour Evaluating the performance of modified adsorbent of zero valent iron nanoparticles – Chitosan composite for arsenate removal from aqueous solutions سلامت و محیط Adsorption Arsenate Chitosan Modified zero valent iron nanoparticles |
author_facet |
K Yaghmaeian N Jaafarzadeh R Nabizadeh H Rasoulzadeh B Akbarpour |
author_sort |
K Yaghmaeian |
title |
Evaluating the performance of modified adsorbent of zero valent iron nanoparticles – Chitosan composite for arsenate removal from aqueous solutions |
title_short |
Evaluating the performance of modified adsorbent of zero valent iron nanoparticles – Chitosan composite for arsenate removal from aqueous solutions |
title_full |
Evaluating the performance of modified adsorbent of zero valent iron nanoparticles – Chitosan composite for arsenate removal from aqueous solutions |
title_fullStr |
Evaluating the performance of modified adsorbent of zero valent iron nanoparticles – Chitosan composite for arsenate removal from aqueous solutions |
title_full_unstemmed |
Evaluating the performance of modified adsorbent of zero valent iron nanoparticles – Chitosan composite for arsenate removal from aqueous solutions |
title_sort |
evaluating the performance of modified adsorbent of zero valent iron nanoparticles – chitosan composite for arsenate removal from aqueous solutions |
publisher |
Tehran University of Medical Sciences |
series |
سلامت و محیط |
issn |
2008-2029 2008-3718 |
publishDate |
2016-03-01 |
description |
Background and Objective: Arsenic is one of the most toxic pollutants in groundwater and surface water. Arsenic could have lots of adverse impacts on human health. Therefore, access to new technologies is required to achieve the arsenic standard.
Materials and Methods: The present study was conducted at laboratory scale in non-continuous batches. The adsorbent of zero-valent iron nanoparticles -Chitosan was produced through reducing ferric iron by sodium borohydride (NaBH4) in the presence of chitosan as a stabilizer. At first, the effect of various parameters such as contact time (5-120 min), pH (3-10), adsorbent dose (0.3-3.5 g/L) and initial concentration of arsenate (2-10 mg/L) were investigated on process efficiency. Then optimum conditions in terms of contact time, pH, adsorbent dose and initial concentration of arsenate were determined by RSM method. Freundlich and Langmuir isotherm model equilibrium constant, pseudo-first and second order kinetic constants were calculated. The residual arsenate was measured y using ICP-AES.
Results: The optimum values based on RSM for pH, absorbent dose, contact time, and initial concentration of arsenate were 7.16, 3.04 g/L, 91.48 min, and 9.71 mg/L respectively. Langmuir isotherm with R2= 0.9904 for Arsenate was the best graph for the experimental data. According to Langmuir isotherm model, the maximum amount of arsenate adsorption was 135.14mg/g. . The investigation of arsenate adsorption kinetics showed that arsenate adsorption follows the pseudo-second kinetics model.
Conclusion: This research showed that the adsorption process is depended on pH. With increasing pH, the ability of amine groups in chitosan are decreased to protonation, caused to decrease the efficiency of arsenate removal at high pH. |
topic |
Adsorption Arsenate Chitosan Modified zero valent iron nanoparticles |
url |
http://ijhe.tums.ac.ir/browse.php?a_code=A-10-542-1&slc_lang=en&sid=1 |
work_keys_str_mv |
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