文献类型：期刊文献

英文题名：Degradation of trichloroethylene in aqueous solution by nanoscale calcium peroxide in the Fe(II)-based catalytic environments

作者：Sun, Yong[1,2];Lyu, Shuguang[1,2];Brusseau, Mark L.[3];Tang, Ping[1];Jiang, Wenchao[1];Gu, Mengbin[1];Li, Ming[1];Lyu, Yanchen[1];Qiu, Zhaofu[1];Sui, Qian[1,2]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[3]Univ Arizona, Sch Earth & Environm Sci, Soil Water & Environm Sci Dept, 429 Shantz Bldg, Tucson, AZ 85721 USA

年份：2019

卷号：226

起止页码：13

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20192607122167);WOS:【SCI-EXPANDED(收录号:WOS:000476961800003)】；

基金：This study was financially supported by a grant from the International Academic Cooperation and Exchange Program of Shanghai Science and Technology Committee (NO. 18230722700). The contributions of Mark L. Brusseau were supported by the NIEHS Superfund Research Program (PS 42 ES04940).

语种：英文

外文关键词：Nano-calcium peroxide (nCaO(2)); Citric acid (CA); Fe(II) activation; Trichloroethylene (TCE); Groundwater remediation

摘要：In this study, nCaO(2) was synthesized successfully and applied in the Fe(II)-based catalytic environments in investigating trichloroethylene (TCE) removal performance. nCaO(2) with the particle sizes in the range of 50-200 nm was prepared, and it performed better for TCE removal when compared to the conventional CaO2. Further experimental results showed that 70.4% of TCE could be removed in 180 min at the nCaO(2)/Fe(II)/TCE molar ratio of 1/2/1, while this data was elevated to 86.1% in the presence of citric acid (CA) at the nCaO(2)/Fe(II)/CA/TCE molar ratio of 1/2/2/1 in the same test period. Probe compound tests, specifically designed for free radicals confirmation, demonstrated the presence of HO center dot and O-2(-center dot). Moreover, scavenging tests indicated that HO center dot was the major radical responsible for TCE degradation but O-2(-center dot) promoted the removal of TCE in both nCaO(2)/Fe(II) and nCaO(2)/Fe(II)-CA system. In addition, the effects of initial solution pH and anions (Cl-, HCO3-) were also evaluated. The performance of TCE degradation in actual groundwater demonstrated that both nCaO(2)/Fe(II) and nCaO(2)/Fe(II)-CA systems can be applicable for TCE removal in ISCO practice and the nCaO(2)/Fe(II)-CA system is much promising technique. These fundamental data strongly confirmed the feasibility and potential of nCaO(2) based technique in the remediation of TCE contaminated groundwater.