文献类型：期刊文献

英文题名：The enhancement roles of layered double hydroxide on the reductive immobilization of selenate by nanoscale zero valent iron: Macroscopic and microscopic approaches

作者：Hu, Baowei[1];Ye, Feng[1];Jin, Chengan[1];Ma, Xiangxian[3];Huang, Chengcai[1];Sheng, Guodong[1,2,5];Ma, Jingyuan[4];Wang, Xiangke[1,2,6];Huang, Yuying[4]

机构：[1]Shaoxing Univ, Coll Life 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]Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China;[4]Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China;[5]Chinese Acad Sci, Inst Plasma Phys, POB 1126, Hefei 230031, Anhui, Peoples R China;[6]King Abdulaziz Univ, NAAM Res Grp, Fac Sci, Jeddah 21589, Saudi Arabia

年份：2017

卷号：184

起止页码：408

外文期刊名：CHEMOSPHERE

收录：SCI-EXPANDED(收录号：WOS:000407525500047)、、EI(收录号：20172403765323)、Scopus(收录号：2-s2.0-85020429337)、WOS

基金：Financial supports from the Natural Science Foundation of Zhejiang Province (LY15B070001) and National Natural Science Foundation of China (21577093, 21207092) is greatly acknowledged. The authors 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; Enhancement roles; Se(VI) immobilization; X-ray absorption fine structure

外文摘要：Herein, we utilized nanoscale zero-valent iron loaded on layered double hydroxide (NZVI/LDH) to immobilize Se(VI) and evaluated the enhancement role of LDH in the NZVI reaction system. The structural characterization indicated that LDH could stabilize and disperse NZVI as well as prevent NZVI from oxidation, thereby increasing iron reactivity. Batch experiments displayed that, compared with those by NZVI, both extent and rate of Se(VI) immobilized by NZVI/LDH significantly increased, owing to the prominent synergistic effect ascribing from adsorption and reduction. Kinetics studies under a series of conditions showed that Se(VI) reaction could be well described by pseudo first-order model. The performance of Se(VI) immobilization was inhibited to a considerable extent by most of co-existing ions, Nevertheless, the presence of Cu2+ improved performance of NZVI/LDH due to its role as a catalyst or medium of charge transfer during reduction. CANES revealed that LDH acted as a promoter for complete reduction of Se(VI) into Se(0)/Se(-II) over a wide pH range, whereas EXAFS suggested that LDH acted as a scavenger for insoluble products, making more reactive sites exposure to Se(VI) for reduction. These results suggested that NZVI/LDH as a promising candidate exhibited potential application in remediation of wastewaters containing Se(VI). (C) 2017 Elsevier Ltd. All rights reserved.