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题名:
Enhanced sequestration of Cr(VI) by nanoscale zero-valent iron supported on layered double hydroxide by batch and XAFS study
作者: Sheng, GD; Hu, J; Li, H; Li, JX; Huang, YY
刊名: CHEMOSPHERE
出版日期: 2016
卷号: 148, 期号:-, 页码:227—232
关键词: HUMIC SUBSTANCE INTERACTION ; OXIDE WATER INTERFACE ; HEXAVALENT CHROMIUM ; ZEROVALENT IRON ; WASTE-WATER ; AQUEOUS-SOLUTIONS ; REMOVAL ; REDUCTION ; ADSORPTION ; KINETICS
DOI: 10.1016/j.chemosphere.2016.01.035
通讯作者: Sheng, GD (reprint author), Shaoxing Univ, Coll Chem & Chem Engn, Hangzhou 312000, Zhejiang, Peoples R China.
文章类型: 期刊文献
英文摘要: Herein, the reduction of nanoscale zero-valent iron (NZVI) and adsorption of layered double hydroxides (LDH) to sequester Cr(VI) were well combined by the immobilization of NZVI onto LDH surface (NZVI/LDH). The characterization results revealed that LDH decreased NZVI aggregation and thus increased Cr(VI) sequestration. The batch results indicated that Cr(VI) sequestration by NZVI/LDH was higher than that of NZVI, and superior to the sum of reduction and adsorption. The LDH with good anion exchange property allowed the adsorption of Cr(VI), facilitating interfacial reaction by increasing the local concentration of Cr(VI) in the NZVI vicinity. X-ray absorption near edge structure (XANES) results indicated that Cr(VI) was almost completely reduced to Cr(III) by NZVI/LDH, but Cr(VI) was partly reduced to Cr(III) by NZVI with a trace of Cr(VI) adsorbed on corrosion products. The coordination environment of Cr from extended X-ray absorption fine structure (EXAFS) analysis revealed that LDH could be a good scavenger for the insoluble products produced during reaction. So, the insoluble products on NZVI could be reduced, and its reactivity could be maintained. These results demonstrated that NZVI/LDH exhibits multiple functionalities relevant to the remediation of Cr(VI)-contaminated sites. (C) 2016 Elsevier Ltd. All rights reserved.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000371099700027
ISSN号: 0045-6535
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/25716
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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Recommended Citation:
Sheng, GD,Hu, J,Li, H,et al. Enhanced sequestration of Cr(VI) by nanoscale zero-valent iron supported on layered double hydroxide by batch and XAFS study[J]. CHEMOSPHERE,2016-01-01,148(-):227—232.
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