Simultaneous Oxidation and Sequestration of As(III) from Water by Using Redox Polymer-Based Fe(III) Oxide Nanocomposite

Water decontamination from As­(III) is an urgent but still challenging task. Herein, we fabricated a bifunctional nanocomposite HFO@PS-Cl for highly efficient removal of As­(III), with active chlorine covalently binding spherical polystyrene host for in situ oxidation of As­(III) to As­(V), and Fe­(...

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Bibliographic Details
Published in:Environmental science & technology 2017-06, Vol.51 (11), p.6326-6334
Main Authors: Zhang, Xiaolin, Wu, Mengfei, Dong, Hao, Li, Hongchao, Pan, Bingcai
Format: Article
Language:English
Subjects:
Adsorption
Arsenic
Bicarbonates
Carbonates
Chemical compounds
Chlorides
Chlorine
Covalence
Decontamination
Drinking water
Effluents
Experiments
Ferric Compounds
Groundwater
Humic acids
Iron
Nanocomposites
Nanoparticles
Oxidation
Oxidation-Reduction
Polymers
Polystyrene
Polystyrene resins
Regeneration
Sulfates
Water
Water Pollutants, Chemical
Water Purification
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Summary:Water decontamination from As­(III) is an urgent but still challenging task. Herein, we fabricated a bifunctional nanocomposite HFO@PS-Cl for highly efficient removal of As­(III), with active chlorine covalently binding spherical polystyrene host for in situ oxidation of As­(III) to As­(V), and Fe­(III) hydroxide (HFO) nanoparticles (NPs) embedded inside for specific As­(V) removal. HFO@PS-Cl could work effectively in a wide pH range (5–9), and other substances like sulfate, chloride, bicarbonate, silicate, and humic acid exert insignificant effect on As­(III) removal. As­(III) sequestration is realized via two pathways, that is, oxidation to As­(V) by the active chlorine followed by specific As­(V) adsorption onto HFO NPs, and As­(III) adsorption onto HFO NPs followed by oxidation to As­(V). The exhausted HFO@PS-Cl could be refreshed for cyclic runs with insignificant capacity loss by the combined regeneration strategy, that is, alkaline solution to rinse the adsorbed As­(V) and NaClO solution to renew the host oxidation capability. In addition, fixed-bed experiments demonstrated that the HFO@PS-Cl column could generate >1760 bed volume (BV) effluent from a synthetic As­(III)-containing groundwater to meet the drinking water standard (
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.7b00724