Simultaneous Oxidation and Sequestration of As (III) from Water by

May 12, 2017 - State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023,. P.R. Chin...
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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

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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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Environment, Nanjing University, Nanjing 210023, P.R. China

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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 (