文献类型：期刊文献

英文题名：Synergetic effect of a pillared bentonite support on SE(VI) removal by nanoscale zero valent iron

作者：Li, Yimin[1];Cheng, Wei[1];Sheng, Guodong[1];Li, Jianfa[1];Dong, Huaping[1];Chen, Ya[1];Zhu, Lizhong[2]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China;[2]Zhejiang Univ, Coll Environm & Resource Sci, Hangzhou 310058, Zhejiang, Peoples R China

年份：2015

卷号：174

起止页码：329

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：SCI-EXPANDED(收录号：WOS:000354505100033)、、EI(收录号：20151200662190)、Scopus(收录号：2-s2.0-84924974928)、WOS

基金：This work was supported by the National Natural Science Foundation of China (21177088, 21207092 and 21477081). The authors thank beamline BL14W1 (Shanghai Synchrotron Radiation Facility) for providing the beam time. We also thank Prof. Yuying Huang for his great help.

语种：英文

外文关键词：Pillared bentonite; Nanoscale zero valent iron; Selenate; Synergetic effect; X-ray absorption fine structure (XAFS)

外文摘要：A positively-charged pillared bentonite (Al-bent) was used as the carrier of nanoscale zerovalent iron (NZVI) particles for accelerating the reductive removal of anionic Se(VI) from water by NZVI. A synergetic effect on Se(VI) removal by this NZVI/Al-bent composite was observed, with removal efficiency (95.7%) much higher than the sum (72.0%) of NZVI reduction (62.1%) and Al-bent adsorption (9.86%). The multiple roles of Al-bent in the reaction system of Se(VI) with NZVI were comprehensively investigated using XAFS techniques, XRD analysis, kinetic studies and pH monitoring. The results indicate that the positively-charged Al-bent as a good adsorbent to anionic Se(VI) accelerated the reductive transformation of Se(VI) into less soluble Se(-II). Al-bent also acted as a pH buffering agent, and contributed to the enhanced stability and reusability of NZVI. In addition, Al-bent could transfer the insoluble reduction products away from the iron surface according to EXAFS studies. Particularly, Al-bent could activate Fe(II) ions generated in the reaction system through an appropriate bonding at pH 8.0, and provide NZVI with an extra reduction capacity. The results indicate the significance of correct matching of bentonite support to target contaminant for developing novel remediation technique based on this natural mineral. (C) 2015 Elsevier B.V. All rights reserved.