文献类型：期刊文献

英文题名：Nanoscale zero-valent iron@mesoporous hydrated silica core-shell particles with enhanced dispersibility, transportability and degradation of chlorinated aliphatic hydrocarbons

作者：Chen, Shuai[1];Bedia, Jorge[2];Li, Hui[1];Ren, Lu Yao[1];Naluswata, Fauzia[1];Belver, Carolina[2]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Univ Autonoma Madrid, Fac Ciencias, Secc Ingn Quim, Campus Cantoblanco, E-28049 Madrid, Spain

年份：2018

卷号：343

起止页码：619

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20181104912951);WOS:【SCI-EXPANDED(收录号:WOS:000430269200064)】；

基金：This work was supported jointly by the National key research and development plan (2016YFC0206200), the National Natural Science Foundation of China (51578240), the Fok Ying Tung Education Foundation (141077), Open Foundation of State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences (SKLECRA2016OFP19), Open Foundation of Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration and the Innovation Program of the Shanghai Municipal Education Commission (14ZZ059), and Spanish MINECO (project CTQ2016-78576-R).

语种：英文

外文关键词：Core-shell NZVI particles; Aggregation; Suspension stability; CAHs treatment; Environmental remediation

摘要：Nanoscale zero-valent iron@mesoporous hydrated silica core-shell particles (NZVI@mHS CSP) with improved dispersibility, transportability and dechlorination strength were successfully synthesized and tested for the removal of chlorinated aliphatic hydrocarbons from groundwater. The structural, electronic and textural features of the NZVI@mHS CSP were characterized by different techniques. The NZVI@mHS CSP depicted a specific surface area of 71 m(2).g(-1), significantly higher, compare to NZVI (12 m(2).g(-1)), with a mesoporous network due to the formation of a hydrated silica shell surrounding the NZVI particle. NZVI@mHS CSP showed an enhanced transportability in sand column compared with NZVI, related to the suspension stability, small aggregated particle size (< 1.3 mu m) and negative particle charge (- 12.11 mV) at neutral pH. NZVI@mHS CSP achieved higher degradation rates than NZVI for the dechlorination of 1,1,1-TCA in synthetic solution and CAHs in real groundwater samples. The dechlorination pathway of 1,1,1-trichloroethane was studied in detail, revealing the formation of 1,1-dichloroethane, ethylene and ethane as the main products. The results of this study prove the ability of NZVI@mHS CSP to transport through a sand column and degrade CAHs pollutants present in real groundwater.