Enhanced carbon tetrachloride degradation by hydroxylamine in ferrous ion activated calcium peroxide in the presence of formic acid  

作　　者：Wenchao Jiang Ping Tang Zhen Liu Huan He Qian Sui Shuguang Lyu 

机构地区：[1]State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process,East China University of Science and Technology,Shanghai 200237,China [2]Environmental Engineering and Science Program,Department of Chemical and Environmental Engineering,University of Cincinnati,Cincinnati,OH 45221-0071,USA

出　　处：《Frontiers of Environmental Science & Engineering》2020年第2期75-85,共11页环境科学与工程前沿（英文）

基　　金：a grant from the National Key R&D Program of China(No.2018YFC1802500);Chinese Scholar Council(CSC,No.201806740035)。

摘　　要：Hydroxyl radicals(HO*)show low reactivity with perchlorinated hydrocarbons,such as carbon tetrachloride(CT),in conventional Fenton reactions,therefore,the generation of reductive radicals has attracted increasing attention.This study investigated the enhancement of CT degradation by the synergistic effects of hydroxylamine(HA)and formic acid(FA)(initial[CT]=0.13 mmol/L)in a Fe(il)activated calcium peroxide(CP)fenton process.CT degradation increased from 56.6%to 99.9%with the addition of 0.78 mmol/L HA to the CP/Fe(II)/FA/CT process in a molar ratio o f 12/6/12/1.The results also showed that the presence of HA enhanced the regeneration of Fe(II)from Fe(III),and the production of HO*increased one-fold when employing benzoic acid as the HO*probe.Additionally,FA slightly improves the production of HO*.A study of the mechanism confirmed that the carbon dioxide radical(C02·),a strong reductant generated by the reaction between FA and HO*,was the dominant radical responsible for CT degradation.Almost complete CT dechlorination was achieved in the process.The presence of humic acid and chloride ion slightly decreased CT removal,while high doses of bicarbonate and high pH inhibited CT degradation.This study helps us to better understand the synergistic roles of FA and HA for HO·and C02·^-generation and the removal of perchlorinated hydrocarbons in modified Fenton systems.

关 键 词：Calcium PEROXIDE HYDROXYLAMINE Modified FENTON Reactive oxygen species Perchlorinated HYDROCARBON 

分 类 号：O62[理学—有机化学]