文献类型：期刊文献

英文题名：Enhanced immobilization of ReO4- by nanoscale zerovalent iron supported on layered double hydroxide via an advanced XAFS approach: Implications for TcO4- sequestration

作者：Sheng, Guodong[1,2];Tang, Yanna[1];Linghu, Wensheng[1];Wang, Lijun[1];Li, Jiaxing[4];Li, Hui[1];Wang, Xiangke[1,2];Huang, Yuying[3]

机构：[1]Shaoxing Univ, Coll Med Sci, Coll Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China;[2]North China Elect Power Univ, Sch Chem & Environm, Beijing 102206, Peoples R China;[3]Chinese Acad Sci, Shanghai Inst Appl Phys, SSRF, Shanghai 201204, Peoples R China;[4]Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Peoples R China

年份：2016

卷号：192

起止页码：268

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：SCI-EXPANDED(收录号：WOS:000375887500030)、、WOS

基金：Financial supports from the National Natural Science Foundation of China (21577093, 21207092), Natural Science Foundation of Zhejiang Province (LY15B070001) is greatly acknowledged. We sincerely thank Dr. Xiang-xian Ma (Key Laboratory of Petroleum Resources, Gansu Province, 730000, P.R. China) for the measurement and analysis of Mossbauer spectra. The authors also thank beamline BL14W1 (Shanghai Synchrotron Radiation Facility) for providing the beam time.

语种：英文

外文关键词：Layered double hydroxide; Nanoscale zero valent iron; Enhanced immobilization; Re(VII); Support effect

外文摘要：This paper was concentrated on a promising remediation strategy for the reductive immobilization of Tc(VII) by studying its chemical analogue Re(VII) to ease the experimental conditions. A novel composite namely nanoscale zero-valent iron supported on layered double hydroxide (NZVI/LDH) was synthesized and applied for the reductive immobilization of Re(VII). Compared to bare NZVI, the as-synthesized NZVI/LDH exhibited higher efficiency on Re(VII) immobilization due to the good synergistic effect between adsorption and reduction. The precise role of LDH was revealed in detail using an advanced approach. The phrase and morphology analysis indicates that NZVI was uniformly supported on LDH, which apparently reduces the aggregation of NZVI and increases its reactivity. Fe-57 Mossbauer spectra suggest that NZVI/LDH displayed a good anti-oxidation performance, leading to the enhanced stability during reaction. X-ray absorption fine structure (XAFS) results show that LDH could promote complete reduction of Re(VII) into Re(IV) by NZVI, while sorption and reduction occurred simultaneously on bare NZVI. Moreover, LDH not only acts as a pH buffering agents but also as a scavenger for the coexisting anions and sparingly soluble products, which improves the reactivity of NZVI. The excellent immobilization performance of NZVI/LDH provides a promising strategy for decontamination of Tc(VII) from groundwater. (C) 2016 Elsevier B.V. All rights reserved.