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Catalysts 2017, 7(5), 131; doi:10.3390/catal7050131

Treatment of Aqueous Bromate by Superparamagnetic BiOCl-Mediated Advanced Reduction Process

1
Institute of Municipal Engineering, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
2
Institute of Port, Coastal and Offshore Engineering, Ocean College, Zhejiang University, Hangzhou 310058, China
3
Environmental Engineering, Jiyang College of Zhejiang A & F University, Zhuji 311800, China
*
Author to whom correspondence should be addressed.
Academic Editors: Giuseppe Marcì and Elisa I. García-López
Received: 22 March 2017 / Revised: 26 April 2017 / Accepted: 27 April 2017 / Published: 1 May 2017
View Full-Text   |   Download PDF [4869 KB, uploaded 1 May 2017]   |  

Abstract

Bromate ( BrO 3 ) contamination in drinking water is a growing concern. Advanced reduction processes (ARPs) are reportedly promising in relieving this concern. In this work, UV/superparamagnetic BiOCl (BiOCl loaded onto superparamagnetic hydroxyapatite) assisted with small molecule carboxylic acid (formate, citrate, and acetate), a carboxyl anion radical ( CO 2 )-based ARP, was proposed to eliminate aqueous BrO 3 . Formate and citrate were found to be ideal CO 2 precursor, and the latter was found to be safe for practical use. BrO 3 (10 μg·L−1, WHO guideline for drinking water) can be completely degraded within 3 min under oxygen-free conditions. In this process, BrO 3 degradation was realized by the reduction of CO 2 (major role) and formyloxyl radical (minor role) in bulk solution. The formation mechanism of radicals and the transformation pathway of BrO 3 were proposed based on data on electron paramagnetic resonance monitoring, competitive kinetics, and degradation product analysis. The process provided a sustainable decontamination performance (<5% deterioration for 10 cycles) and appeared to be more resistant to common electron acceptors (O2, NO 3 , and Fe3+) than hydrated electron based-ARPs. Phosphate based-superparamagnetic hydroxyapatite, used to support BiOCl in this work, was believed to be applicable for resolving the recycling problem of other metal-containing catalyst. View Full-Text
Keywords: bromate; carboxyl anion radical; reduction; magnetic recovering bromate; carboxyl anion radical; reduction; magnetic recovering
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Liu, X.; Wang, L.; Sun, Z.; Shao, Y.; Yu, T. Treatment of Aqueous Bromate by Superparamagnetic BiOCl-Mediated Advanced Reduction Process. Catalysts 2017, 7, 131.

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