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Enhanced sequestration of Cr(VI) by nanoscale zero-valent iron supported on layered double hydroxide by batch and XAFS study
Sheng, GD; Hu, J; Li, H; Li, JX; Huang, YY; Sheng, GD (reprint author), Shaoxing Univ, Coll Chem & Chem Engn, Hangzhou 312000, Zhejiang, Peoples R China.
2016
Source PublicationCHEMOSPHERE
ISSN0045-6535
Volume148Issue:-Pages:227—232
Subtype期刊文献
AbstractHerein, 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.
KeywordHumic Substance Interaction Oxide Water Interface Hexavalent Chromium Zerovalent Iron Waste-water Aqueous-solutions Removal Reduction Adsorption Kinetics
DOI10.1016/j.chemosphere.2016.01.035
Indexed BySCI
Language英语
WOS IDWOS:000371099700027
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/25716
Collection中科院上海应用物理研究所2011-2018年
Corresponding AuthorSheng, GD (reprint author), Shaoxing Univ, Coll Chem & Chem Engn, Hangzhou 312000, Zhejiang, Peoples R China.
Recommended Citation
GB/T 7714
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,2016,148(-):227—232.
APA Sheng, GD,Hu, J,Li, H,Li, JX,Huang, YY,&Sheng, GD .(2016).Enhanced sequestration of Cr(VI) by nanoscale zero-valent iron supported on layered double hydroxide by batch and XAFS study.CHEMOSPHERE,148(-),227—232.
MLA Sheng, GD,et al."Enhanced sequestration of Cr(VI) by nanoscale zero-valent iron supported on layered double hydroxide by batch and XAFS study".CHEMOSPHERE 148.-(2016):227—232.
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