文献类型：期刊文献

英文题名：Enhanced sequestration of selenite in water by nanoscale zero valent iron immobilization on carbon nanotubes by a combined batch, XPS and XAFS investigation

作者：Sheng, Guodong[1,3,4,5];Alsaedi, Ahmed[4];Shammakh, Wafa[4];Monaquel, Shatha[4];Sheng, Jiang[2];Wang, Xiangke[1,4];Li, Hui[1];Huang, Yuying

机构：[1]Shaoxing Univ, Coll Med Sci, Coll Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China;[2]Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Peoples R China;[3]Chinese Acad Sci, Shanghai Inst Appl Phys, SSRF, Shanghai 201204, Peoples R China;[4]King Abdulaziz Univ, NAAM Res Grp, Fac Sci, Jeddah 21589, Saudi Arabia;[5]Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Peoples R China

年份：2016

卷号：99

起止页码：123

外文期刊名：CARBON

收录：SCI-EXPANDED(收录号：WOS:000369069800015)、、EI(收录号：20161002050667)、Scopus(收录号：2-s2.0-84959357027)、WOS

基金：This project was funded by the Deanship of Scientific Research (DSR), King Abdulaziz University, under grant no. 41-130-36-HiCi. The authors, therefore, acknowledge with thanks DSR technical and financial support.

语种：英文

外文关键词：Carbon nanotubes - Corrosion - Detoxification - Iron - X ray absorption - X ray photoelectron spectroscopy

外文摘要：In this paper, nanoscale zero-valent iron (NZVI) immobilized on carbon nanotube (CNT) composite (NZVI/CNT) was prepared, characterized and used for the sequestration of Se(IV) in water. The structural analysis revealed that NZVI were uniformly immobilized on CNT surfaces, and thus the oxidation and aggregation of NZVI was obviously minimized. Compared to bare NZVI, the NZVI/CNT exhibited much higher efficiency on Se(IV) sequestration due to the good synergistic effect between CNT adsorption and NZVI reduction. The results from X-ray absorption fine structure (XAFS) revealed that Se(IV) could be almost completely reduced into Se(0)/Se(-II) by NZVI/CNT, while partial reduction occurred on NZVI with a trace of Se(IV) adsorbed on the corrosion products. Besides, the role of pH in Se(IV) sequestration on NZVI/CNT was lower than that on NZVI due to the buffering effect of CNT. Moreover, CNT immobilization could also weaken the inhibition effect of humic acid (HA) on the removal of Se(IV) by NZVI, since CNT showed strong adsorption for HA that blocks potential reactivity. The excellent performance of NZVI/CNT offer a promising material for detoxification of Se(IV) from wastewater. (C) 2015 Elsevier Ltd. All rights reserved.