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Simultaneous Oxidation and Sequestration of As(III) from Water by Using Redox Polymer-based Fe(III) oxide Nanocomposite Xiaolin Zhang, Mengfei Wu, Hao Dong, Hongchao Li, and Bing-Cai Pan Environ. Sci. Technol., Just Accepted Manuscript • Publication Date (Web): 12 May 2017 Downloaded from http://pubs.acs.org on May 12, 2017
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Environmental Science & Technology
Table of content
ACS Paragon Plus Environment
Environmental Science & Technology
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Simultaneous Oxidation and Sequestration of As(III) from Water by Using
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Redox Polymer-based Fe(III) oxide Nanocomposite
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Xiaolin Zhang, †‡ Mengfei Wu, † Hao Dong, † Hongchao Li, † and Bingcai Pan*†‡
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†
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Environment, Nanjing University, Nanjing 210023, P.R. China
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‡
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University, Nanjing 210023, China
State Key Laboratory of Pollution Control and Resource Reuse, School of the
Research Center for Environmental Nanotechnology (ReCENT), Nanjing
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*To whom correspondence should be addressed
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E-mail:
[email protected] (B. C. Pan)
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Tel: +86-25-8968-0390
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Environmental Science & Technology
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Abstract
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Water decontamination from As(III) is an urgent but still challenging task. Herein,
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we fabricated a bifunctional nanocomposite HFO@PS-Cl for highly efficient removal
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of As(III), with active chlorine covalently binding spherical polystyrene host for in
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situ oxidation of As(III) to As(V), and Fe(III) hydroxide (HFO) nanoparticles (NPs)
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embedded inside for specific As(V) removal. HFO@PS-Cl could work effectively in a
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wide pH range (5-9), and other substances like sulfate, chloride, bicarbonate, silicate
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and humic acid exert insignificant effect on As(III) removal. As(III) sequestration is
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realized via two pathways, i.e., oxidation to As(V) by the active chlorine followed by
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specific As(V) adsorption onto HFO NPs, and As(III) adsorption onto HFO NPs
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followed by oxidation to As(V). The exhausted HFO@PS-Cl could be refreshed for
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cyclic runs with insignificant capacity loss by the combined regeneration strategy, i.e.,
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alkaline solution to rinse the adsorbed As(V) and NaClO solution to renew the host
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oxidation capability. In addition, fixed-bed experiments demonstrated that the
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HFO@PS-Cl column could generate >1760 bed volume (BV) effluent from a
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synthetic As(III)-containing groundwater to meet the drinking water standard (
