Iron species activating chlorite:Neglected selective oxidation for water treatment  

作　　者：Qihui Xu Zhipeng Li Feng Liu Hong You Binghan Xie 

机构地区：[1]State Key Laboratory of Urban Water Resources and Environment,Harbin Institute of Technology,Harbin,150090,China [2]School of Marine Science and Technology,Harbin Institute of Technology at Weihai,Weihai,264209,China

出　　处：《Environmental Science and Ecotechnology》2023年第2期63-71,共9页环境科学与生态技术（英文）

基　　金：supported by the State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology(2019DX08);National Natural Science Foundation of China(52100036),Natural Science Foundation of Shan-dong Province of China(ZR20210E119);Open Project of State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology(QA202140);Scientific Research Foundation of Harbin Institute of Technology at Weihai(HIT(WH)2019).

摘　　要：Chlorite(ClO_(2)-)is the by-product of the water treatment process carried out using chlorine dioxide(ClO_(2))as an effective disinfectant and oxidant;however,the reactivation of ClO_(2)has commonly been overlooked.Herein,it was unprecedentedly found that ClO_(2)could be activated by iron species(Feb:Fe0,FeII,or FeIII),which contributed to the synchronous removal of ClO_(2)and selective oxidative treatment of organic contaminants.However,the above-mentioned activation process presented intensive Ht-dependent reactivity.The introduction of Feb significantly shortened the autocatalysis process via the accumulation of Clor ClOduring the protonation of ClO_(2)driven by ultrasonic field.Furthermore,it was found that the interdependent high-valent-Fe-oxo and ClO_(2),after identification,were the dominant active species for accelerating the oxidation process.Accordingly,the unified mechanisms based on coordination catalysis([FeN(H_(2)O)a(ClOxm)b]nt-P)were putative,and this process was thus used to account for the pollutant removal by the Feb-activated protonated ClO_(2).This study pioneers the activation of ClO_(2)for water treatment and provides a novel strategy for“waste treating waste”.Derivatively,this activation process further provides the preparation methods for sulfones and ClO_(2),including the oriented oxidation of sulfoxides to sulfones and the production of ClO_(2) for on-site use.

关 键 词：Iron species CHLORITE High-valent-Fe-oxo Chlorine dioxide Coordination catalysis 

分 类 号：X703[环境科学与工程—环境工程]