文献类型：期刊文献

英文题名：Impact of Peroxymonocarbonate on the Transformation of Organic Contaminants during Hydrogen Peroxide in Situ Chemical Oxidation

作者：Yang, Xuejing[1,2];Duan, Yanghua[1];Wang, Jinling[2,3];Wang, Hualin[2,3];Liu, Honglai[3];Sedlak, David L.[1]

机构：[1]Univ Calif Berkeley, Dept Civil & Environm Engn, Berkeley, CA 94720 USA;[2]East China Univ Sci & Technol, Natl Engn Lab Ind Wastewater Treatment, Shanghai 200237, Peoples R China;[3]ECUST, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：6

期号：12

起止页码：781

外文期刊名：ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS

收录：;EI(收录号：20194707708409);WOS:【SCI-EXPANDED(收录号:WOS:000502418500016)】；

基金：We acknowledge support from the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA23010400), the National Natural Science Foundation of China (21876049), U.S. National Institute for Environmental Health Sciences Superfund Research Program (NIEHS Grant P42 ES004705) at the University of California, Berkeley, US/China Clean Energy Research Center for Water-Energy Technologies, and the International Postdoctoral Exchange Fellowship Program of China (20150074).

语种：英文

外文关键词：Oxidation

摘要：Under the conditions employed when in situ chemical oxidation is used for contaminant remediation, high concentrations of H2O2 (e.g., up to similar to 10 M) are typically present. Using C-13 NMR, we show that in carbonate-rich systems, these high concentrations of H2O2 result in a reaction with HCO3- to produce peroxymonocarbonate (HCO4-). After formation, HCO4- reacts with phenol to produce di- and trihydroxyl phenols. HCO4- reacts with substituted phenols in a manner consistent with its electrophilic character. Exchanging an electron-donating substituent in the para position of a phenolic compound with an electron-withdrawing group decreased the reaction rate. Results of this study indicate that HCO4- is a potentially important but previously unrecognized oxidative species generated during H2O2 in situ chemical oxidation that selectively reacts with electron-rich organic compounds. Under conditions in which HO center dot formation is inefficient (e.g., relatively high concentration of HCO3-, low total Fe and Mn concentrations), the fraction of the phenolic compounds that is transformed by HCO4- could be similar to or greater than the fraction transformed by HO center dot. It may be possible to adjust treatment conditions to enhance the formation of HCO4- as a means of accelerating rates of contaminant removal.