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Arsenic removal from aqueous solutions by adsorption onto iron oxide/activated carbon magnetic composite

In this work the adsorption features of activated carbon and the magnetic properties of iron oxides were combined in a composite to produce magnetic adsorbent. Batch experiments were conducted to study the adsorption behavior of arsenate onto the synthetic magnetic adsorbent. The effects of initial...

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Detalles Bibliográficos
Autores principales: Yao, Shuhua, Liu, Ziru, Shi, Zhongliang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3973847/
https://www.ncbi.nlm.nih.gov/pubmed/24602339
http://dx.doi.org/10.1186/2052-336X-12-58
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author Yao, Shuhua
Liu, Ziru
Shi, Zhongliang
author_facet Yao, Shuhua
Liu, Ziru
Shi, Zhongliang
author_sort Yao, Shuhua
collection PubMed
description In this work the adsorption features of activated carbon and the magnetic properties of iron oxides were combined in a composite to produce magnetic adsorbent. Batch experiments were conducted to study the adsorption behavior of arsenate onto the synthetic magnetic adsorbent. The effects of initial solution pH, contact time, adsorbent dosage and co-existing anionic component on the adsorption of arsenate were investigated. The results showed that the removal percentage of arsenate could be over 95% in the conditions of adsorbent dosage 5.0 g/L, initial solution pH 3.0-8.0, and contact time 1 h. Under the experimental conditions, phosphate and silicate caused greater decrease in arsenate removal percentage among the anions, and sulfate had almost no effect on the adsorption of arsenate. Kinetics study showed that the overall adsorption rate of arsenate was illustrated by the pseudo-second-order kinetic model. The applicability of the Langmuir and Freundlich models for the arsenate adsorption data was tested. Both the models adequately describe the experimental data. Moreover, the magnetic composite adsorbent could be easily recovered from the medium by an external magnetic field. It can therefore be potentially applied for the treatment of water contaminated by arsenate.
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spelling pubmed-39738472014-04-11 Arsenic removal from aqueous solutions by adsorption onto iron oxide/activated carbon magnetic composite Yao, Shuhua Liu, Ziru Shi, Zhongliang J Environ Health Sci Eng Research Article In this work the adsorption features of activated carbon and the magnetic properties of iron oxides were combined in a composite to produce magnetic adsorbent. Batch experiments were conducted to study the adsorption behavior of arsenate onto the synthetic magnetic adsorbent. The effects of initial solution pH, contact time, adsorbent dosage and co-existing anionic component on the adsorption of arsenate were investigated. The results showed that the removal percentage of arsenate could be over 95% in the conditions of adsorbent dosage 5.0 g/L, initial solution pH 3.0-8.0, and contact time 1 h. Under the experimental conditions, phosphate and silicate caused greater decrease in arsenate removal percentage among the anions, and sulfate had almost no effect on the adsorption of arsenate. Kinetics study showed that the overall adsorption rate of arsenate was illustrated by the pseudo-second-order kinetic model. The applicability of the Langmuir and Freundlich models for the arsenate adsorption data was tested. Both the models adequately describe the experimental data. Moreover, the magnetic composite adsorbent could be easily recovered from the medium by an external magnetic field. It can therefore be potentially applied for the treatment of water contaminated by arsenate. BioMed Central 2014-03-06 /pmc/articles/PMC3973847/ /pubmed/24602339 http://dx.doi.org/10.1186/2052-336X-12-58 Text en Copyright © 2014 Yao et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.
spellingShingle Research Article
Yao, Shuhua
Liu, Ziru
Shi, Zhongliang
Arsenic removal from aqueous solutions by adsorption onto iron oxide/activated carbon magnetic composite
title Arsenic removal from aqueous solutions by adsorption onto iron oxide/activated carbon magnetic composite
title_full Arsenic removal from aqueous solutions by adsorption onto iron oxide/activated carbon magnetic composite
title_fullStr Arsenic removal from aqueous solutions by adsorption onto iron oxide/activated carbon magnetic composite
title_full_unstemmed Arsenic removal from aqueous solutions by adsorption onto iron oxide/activated carbon magnetic composite
title_short Arsenic removal from aqueous solutions by adsorption onto iron oxide/activated carbon magnetic composite
title_sort arsenic removal from aqueous solutions by adsorption onto iron oxide/activated carbon magnetic composite
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3973847/
https://www.ncbi.nlm.nih.gov/pubmed/24602339
http://dx.doi.org/10.1186/2052-336X-12-58
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AT shizhongliang arsenicremovalfromaqueoussolutionsbyadsorptionontoironoxideactivatedcarbonmagneticcomposite