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Open AccessArticle

Different Role of Bisulfite/Sulfite in UVC-S(IV)-O2 System for Arsenite Oxidation in Water

1
Department of Environmental Science and Engineering, School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China
2
School of Civil Engineering, Engineering Research Center of Urban Disasters Prevention and Fire Rescue Technology of Hubei Province, Wuhan University, Wuhan 430072, China
3
Voevodsky Institute of Chemical Kinetics and Combustion, Institutskaya 3, 630090 Novosibirsk, Russia
4
Novosibirsk State University, Pirogova str. 2, 630090 Novosibirsk, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Ming-Chung Wu
Molecules 2019, 24(12), 2307; https://doi.org/10.3390/molecules24122307
Received: 16 May 2019 / Revised: 12 June 2019 / Accepted: 14 June 2019 / Published: 21 June 2019
(This article belongs to the Special Issue Advanced Materials and Technologies for Wastewater Treatment)
It is of interest to use UV-sulfite based processes to degrade pollutants in wastewater treatment process. In this work, arsenic (As(III)) has been selected as a target pollutant to verify the efficacy of such a hypothesized process. The results showed that As(III) was quickly oxidized by a UV-sulfite system at neutral or alkaline pH and especially at pH 9.5, which can be mainly attributed to the generated oxysulfur radicals. In laser flash photolysis (LFP) experiments (λex = 266 nm), the signals of SO3•− and eaq generated by photolysis of sulfite at 266 nm were discerned. Quantum yields for photoionization of HSO3 (0.01) and SO32− (0.06) were also measured. It has been established that eaq does not react with SO32−, but reacts with HSO3 with a rate constant 8 × 107 M−1s−1. View Full-Text
Keywords: sulfite photolysis; arsenic; laser flash photolysis; quantum yields; oxysulfur radicals sulfite photolysis; arsenic; laser flash photolysis; quantum yields; oxysulfur radicals
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MDPI and ACS Style

Luo, T.; Wang, Z.; Wang, Y.; Liu, Z.; P. Pozdnyakov, I. Different Role of Bisulfite/Sulfite in UVC-S(IV)-O2 System for Arsenite Oxidation in Water. Molecules 2019, 24, 2307.

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