文献类型：期刊文献

英文题名：Insight into mechanism of arsanilic acid degradation in permanganate-sulfite system: Role of reactive species

作者：Shi, Zhenyu[1,2] Jin, Can[3] Zhang, Jing[4] Zhu, Liang[1]

第一作者：Shi, Zhenyu

通信作者：Zhu, L[1];Zhang, J[2]

机构：[1]Hohai Univ, Coll Environm, Nanjing 210098, Jiangsu, Peoples R China;[2]Environm Monitoring Ctr Jiangsu Prov, State Environm Protect Key Lab Monitoring & Anal, Nanjing 210036, Jiangsu, Peoples R China;[3]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Key Lab Biomass Energy & Mat Jiangsu Prov, Nanjing 210042, Jiangsu, Peoples R China;[4]Chongqing Univ, Key Lab Three Gorges Reservoir Regions Ecoenviron, Minist Educ, Sch Urban Construct & Environm Engn, Chongqing 400045, Peoples R China

年份：2019

卷号：359

起止页码：1463-1471

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20184606062333);Scopus(收录号：2-s2.0-85056247812);WOS:【SCI-EXPANDED(收录号:WOS:000454137400140)】；

基金：This work was supported by the National Natural Science Foundation of China (51508152 and 51878095), the Natural Science Foundation of Jiangsu Province, China (BK20150812), the Foundation of the State Key Laboratory of Pollution Control and Resource Reuse, China (PCRRF16019).

语种：英文

外文关键词：Permanganate; Sulfite; Sulfate radical; Advanced oxidation process; Arsanilic acid

摘要：This work investigated the fast degradation of ASA by a novel advanced oxidation process (permanganate (Mn-VII)-sulfite (S-IV)). The results showed that the combination of Mn(VII) (50 mu M) and S(IV) (250 mu M) at pH 5.0 triggered near-instantaneous decomposition of similar to 71% ASA (5 mu M) within 15 s. The reaction parameters, which affected the degradation of ASA, such as pH (4.0-9.0), initial concentration of ASA (1-30 mu M), and molar ratio of S(IV)/Mn(VII) (1-20), were systematically investigated. Specifically, sulfate radical (SO4 center dot-), hydroxyl radical ((OH)-O-center dot), and Mn intermediates were considered as the important reactive species in Mn(VII)-S(IV) process. Radical scavenging tests showed that both SO4 center dot- and (OH)-O-center dot contributed to the removal of ASA, with SO4 center dot- playing a dominant role. The contributions of reactive radicals, which were excluded in Mn(VI)-S(IV) system by previous researchers, for the degradation of organic contaminants was clarified for the first time. Therefore, our study can be considered as a necessary complement to previous studies about Mn(VII)-S(IV) system. Halide ions inhibited the removal of ASA following a trend of F- < Cl- < Br- < I- due to their competition for reactive radicals with ASA. The degradation products of ASA were identified, and the plausible reaction pathways were proposed, and their toxicity was assessed using luminescent bacteria Vibrio fischeri. Finally, the satisfying performance of Mn(VII)-S(IV) system in a natural water sample indicated it was a promising method for degrading organic contaminants in real water.