文献类型：期刊文献

英文题名：The role of active manganese species and free radicals in permanganate/bisulfite process

作者：Chen, Jie[1,2];Rao, Dandan[1,2];Dong, Hongyu[1,2];Sun, Bo[3];Shao, Binbin[1,2];Cao, Guomin[2,4];Guan, Xiaohong[1,2]

机构：[1]Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Shanghai 200092, Peoples R China;[2]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[3]Shandong Univ, Sch Environm Sci & Engn, Shandong Key Lab Water Pollut Control & Resource, Qingdao 266237, Peoples R China;[4]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China

年份：2020

卷号：388

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：;EI(收录号：20195107881775);WOS:【SCI-EXPANDED(收录号:WOS:000524462500014)】；

基金：This work was supported by the National Natural Science Foundation of China (Grants 21976133 and 21522704).

语种：英文

外文关键词：PM/BS process; Reactive manganese species; Hydroxyl radical; Sulfate radical

摘要：Bisulfite-activated permanganate (PM/BS) process has shown extremely great potential for the rapid degradation of organic contaminants while the active oxidants involved in this process have been under disputation. In this work, the active oxidants in PM/BS process were re-identified and the contributions of different active oxidants to the degradation of various organic contaminants were investigated with a competition kinetics method. Many lines of evidence indicated that both radical species, including hydroxyl radical (HO.) and sulfate radical (SO4.-), and reactive manganese species (RMnS), including Mn(VI), Mn(V), and possible Mn(III), contribute to the degradation of contaminants in PM/BS process. SO4.- contributed much more than HO. to the degradation of all contaminants of interest except nitrobenzene in PM/BS process. RMnS were very selective and showed high reactivity to phenolic and sulfoxide compounds as well as carbamazepine. With the increase of initial pH and the [bisulfite]/[permanganate] molar ratio, a mechanistic changeover from RMnS to radicals occurred during phenol degradation in PM/BS process. The generation of RMnS and radical species, especially SO4.-, could be well explained by the proposed mechanism consisting of radical chain reactions and manganese reduction reactions via both electron transfer and oxygen transfer steps.