文献类型：期刊文献

英文题名：Carbon dioxide radical anion-based UV/S2O82-/HCOOH reductive process for carbon tetrachloride degradation in aqueous solution

作者：Gu, Xiaogang[1,2];Lu, Shuguang[1];Fu, Xiaori[1];Qiu, Zhaofu[1];Sui, Qian[1];Guo, Xuhong[1,2]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2017

卷号：172

起止页码：211

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20164102883244);WOS:【SCI-EXPANDED(收录号:WOS:000385602300024)】；

基金：This study was financially supported by the grant from the National Natural Science Foundation of China (Nos. 41373094 and 51208199), Natural Science Foundation of Shanghai (16ZR1407200), China Postdoctoral Science Foundation (2015M570341), and the Fundamental Research Funds for the Central Universities (222201514339 and 22A201514057).

语种：英文

外文关键词：Ultraviolet irradiation; Persulfate; Formic acid; Carbon dioxide radical anion; Carbon tetrachloride degradation

摘要：The reduction performance of carbon tetrachloride (CT) mediated by carbon dioxide radical anion (CO2 center dot-) was investigated in this study, and CO2 center dot- was generated by the reaction of formic acid and sulfate radical produced in the UV/S2O82- process. The effects of various factors including persulfate and formic acid concentrations, solution pH, and anions such as Cl--, HCO3-, NO3-, and SO42- were evaluated. The experimental results showed that CT could be almost completely removed in 60 min with 1.50 mM persulfate and 2.25 mM formic acid. CT degradation efficiency was found to increase with increasing persulfate (0.75-4.50 mM) and formic acid (0.75-2.25 mM) concentrations. In the pH adjusted solutions (from pH 6-8), maximum CT degradation occurred at pH 6. Both Cl- and NO3- (1-100 mM), as well as HCO3- at high concentrations (10 and 100 mM), adversely affected CT degradation performance. The addition of methyl viologen as CO2 center dot- scavengers proved the presence of CO2 center dot- in this UV/S2O82-/HCOOH process, and the dechlorination of CT was not complete as release rate was 80.6% after 240 min. (C) 2016 Elsevier B.V. All rights reserved.