文献类型：期刊文献

英文题名：Strong enhancement of trichloroethylene degradation in ferrous ion activated persulfate system by promoting ferric and ferrous ion cycles with hydroxylamine

作者：Wu, Xiaoliang[1];Gu, Xiaogang[1];Lu, Shuguang[1];Qiu, Zhaofu[1];Sui, Qian[1];Zang, Xueke[1];Miao, Zhouwei[1];Xu, Minhui[1]

机构：[1]E China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China

年份：2015

卷号：147

起止页码：186

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20151900834320);WOS:【SCI-EXPANDED(收录号:WOS:000356553300020)】；

基金：This study was financially supported by the grant from the National Environmental Protection Public Welfare Science and Technology Research Program of China (No. 201109013), the National Natural Science Foundation of China (Nos. 41373094 and 51208199), the Shanghai Natural Science Funds (No. 12ZR1408000), China Postdoctoral Science Foundation (No. 2013T60429), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Persulfate; Ferrous ion; Trichloroethylene; Hydroxylamine; Reactive oxygen species

摘要：The persulfate (PS) activated by ferrous ion (Fe(II)) system could generate reactive oxygen species capable of degrading refractory organic contaminants trichloroethylene (TCE). Nevertheless, the slow conversion from ferric ion (Fe(III)) back to Fe(II) limits its widespread practical application. Therefore, different reducing agents, i.e., hydroxylamine (HA), sodium thiosulfate, ascorbic acid, sodium ascorbate and sodium sulfite, were added into PS/HA system for accelerating the Fe(II) regeneration, and HA was most efficient in TCE degradation. The effects of HA, Fe(II) and PS concentrations were also evaluated in PS/Fe(II)/HA system. The results indicated that a proper HA and Fe(II) concentrations were needed in practical application, too low or too high dosages were adverse to TCE degradation. Moreover, TCE degradation was increased with the increasing of PS dosage over the tested range. The radical scavenging tests confirmed that the primary reactive oxygen species were sulfate radicals ((SO4-)-S-center dot), hydroxyl radicals ((OH)-O-center dot) and superoxide radical (O-2(-center dot)) in PS/Fe(II)/HA process. Both inorganic anions (Cl-, HCO3-, SO42-, NO3- ions) and natural organic matter had inhibitory effects on TCE removal, and the suppressive effects of inorganic anions can be ranked in an ascending order of NO3-