文献类型：期刊文献

英文题名：Decontamination of U(VI) from nZVI/CNF composites investigated by batch, spectroscopic and modeling techniques

作者：Hu, Baowei[1];Mei, Xue[1];Li, Xue[1];Hu, Jun[2];Xu, Di[3];Ma, Jingyuan[4];Huang, Yuying[4]

机构：[1]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China;[2]Dongguan Univ Technol, Sch Elect Engn, Dongguan 523808, Guangdong, Peoples R China;[3]Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China;[4]Chinese Acad Sci, Shanghai Inst Appl Phys, SSRF, Shanghai 201204, Peoples R China

年份：2017

卷号：237

起止页码：1

外文期刊名：JOURNAL OF MOLECULAR LIQUIDS

收录：SCI-EXPANDED(收录号：WOS:000403510900001)、、EI(收录号：20171703601340)、Scopus(收录号：2-s2.0-85018481453)、WOS

基金：Financial supports from the Natural Science Foundation of China (21207092, 21577093) and Science and Technology Project of Shaoxing (2014B70041) are acknowledged.

语种：英文

外文关键词：nZVI; Carbon nanofibers; U(VI); EXAFS; Adsorption mechanism

外文摘要：The nZVI/CNF composites were synthesized by borohydride reduction of ferrous salts in the CNF suspension. The characteristic results indicated that metallic Fe-0 was uniformly dispersed the surface of CNFs. The decontamination mechanism of U(VI) from nZVI/CNF composites was investigated by batch, XPS, EXAFS and modeling techniques. The batch experiments indicated that removal amount of U(VI) on nZVI/CNF was significantly higher than that of single nZVI, whereas reduction amount of U(VI) to U(IV) on nZVI at pH> 6.0 was significantly higher than that of nZVI/CNF. The EXAFS spectra of U-nZVI at pH 7.0 was similar to the (UO2)-O-(Iv)(s), whereas the EXAFS spectra of U-nZVI/CNF at 2.98 A can be satisfactorily fitted by U-U shell, which was further demonstrated by XANES analysis and surface complexation modeling. The diffuse layer model gave better fits to U(VI) removal on nZVI/CNFs composites, whereas underestimation of U(VI) removal on nZVI was observed at pH > 5.0 due to the presence of reductive precipitation. These findings indicated that nZVI-based composites presented the higher adsorption performance and the excellent reduction capacity for U(VI) under permeable reactive barrier system. (C) 2017 Elsevier B.V. All rights reserved.