文献类型：期刊文献

英文题名：Efficient selenate removal by zero-valent iron in the presence of weak magnetic field

作者：Liang, Liping[2];Guan, Xiaohong[1];Huang, Yuying[3];Ma, Jingyuan[3];Sun, Xueping[3];Qiao, Junlian[1];Zhou, Gongming[1]

机构：[1]Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Shanghai 200092, Peoples R China;[2]Shaoxing Univ, Coll Life Sci, Shaoxing, Peoples R China;[3]Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai, Peoples R China

年份：2015

卷号：156

起止页码：1064

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000366538000021)、、EI(收录号：20154401488504)、Scopus(收录号：2-s2.0-84948716780)、WOS

基金：This work was supported by the National Natural Science Foundation of China - China (21277095 and 51478329), the Zhejiang Province Natural Science Foundation (LQ15E0 80003), the Shaoxing University of Research Startup Project (20145033), the Specialized Research Fund for the Doctoral Program of Higher Education (20130072110026), and the Tongji University Open Funding for Materials Characterization (2013080). The authors thank beam-lines BL14W1 and BL14B1 (Shanghai Synchrotron Radiation Facility) for providing the beam time.

语种：英文

外文关键词：Selenate; Reduction; Adsorption; Corrosion products; Lepidocrocite

外文摘要：Se(VI) was very refractory to be removed by zero-valent iron (ZVI), therefore weak magnetic field (WMF) was employed to achieve efficient Se(VI) removal by ZVI. Batch experiments showed that negligible Se (VI) (<4%) was removed by ZVI without the application of WMF within 72 h. The presence of WMF dramatically enhanced Se(VI) sequestration by ZVI and complete removal of 10.0 mg L-1 Se(VI) was achieved by ZVI in 90 min. The main portion of kinetics of Se(VI) removal by ZVI in the presence of WMF followed zero-order rate law and the rate constants of Se(VI) sequestration by ZVI increased progressively with increasing the ZVI dosage. Fe K-edge XAFS spectra and synchrotron radiation-XRD analysis revealed that ZVI was transformed to X-ray amorphous Fe304 before finally transformed to lepidocrocite (7-Fe0OH). The LCF analysis of Se K-edge XANES spectra indicated that adsorptive removal of Se(VI) was minor but adsorption of Se(VI) to the corroded ZVI surface was the first step of Se(VI) removal. Se(VI) was rapidly reduced to Se(IV), which could be further transformed to Se(0). Comparison of the performance of Se(VI) removal in the literature suggested that employing WMF to enhance Se(VI) removal by ZVI under oxic conditions be a promising method. (C) 2015 Elsevier B.V. All rights reserved.