文献类型：期刊文献

英文题名：Efficient novel amphiphilic double shells layer coupled with nanoscale zero-valent composite for the degradation of trichloroethylene

作者：Li, Can[1];Lu, Qiang[1];Zhan, Cong[1];Tariq, Muhammad[1];Huang, Kai[1];Liu, Fuwen[1];Zhu, Fei[1];Liu, Guanhong[1];Cui, Changzheng[1];Lin, Kuangfei[1]

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

年份：2019

卷号：659

起止页码：821

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20190206350072);WOS:【SCI-EXPANDED(收录号:WOS:000457293700081)】；

基金：This study was supported jointly by the National Natural Science Foundation of China (51708223, 41301329) and Shanghai Municipal Science and Technology Commission (17DZ1202304). We also would like to thank the anonymous referees for their helpful comments.

语种：英文

外文关键词：CDSN; Trichloroethylene; Oxidation resistance; Strong adsorption; Groundwater remediation

摘要：An efficient novel amphiphilic material composed of core-double shells nanocomposite (CDSN) with nanoscale zero-valent iron (NZVI) as the core and PS100-b-PAA(16) as inner shell and chitosan as outmost shell has been synthesized successfully. Its application to remove the trichloroethylene (TCE) in stimulated TCE solution with 7.3 +/- 0.3 mg/L dissolved oxygen was investigated. The results showed that CDSN after exposure to air for a month could still remove 92.6% of TCE as compared to 61.5% removal rate of NZVI in 360min (the gram ratio of material: TCE equals to 10: 1), exhibiting the great oxidation resistance performance. Specifically, dynamic research of the total removal divided into adsorption by shell layer and degradation by reducibility of NZVI at a predetermined interval was engaged to understand the complete mass transfer process of TCE. The results revealed that CDSN adsorbed 1.5 to 2 folds time TCE as compared to NZVI in the same initial pH=8.5 aqueous solution. Importantly, CDSN could sustain fixed reactivity to remove about 94.8% of TCE from the start to end. NZVI exhibited greater removal capacity in first 180 min, but later it lost the reducibility and finial removal rate was 89%. The selective adsorption to protonated CDSN was strengthened to increase the removal of TCE at pH 3.5 while NZVI had a worse removal in pH 3.5 performance than pH 8.5. (c) 2018 Published by Elsevier B.V.