Enhanced sequestration of Cr(VI) by nanoscale zero-valent iron supported on layered double hydroxide by batch and XAFS study

Chemosphere
Guodong ShengYuying Huang

Abstract

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 ...Continue Reading

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Citations

Oct 3, 2018·International Journal of Environmental Research and Public Health·Fayuan WangYuhuan Sun
Jan 24, 2017·Journal of Radioanalytical and Nuclear Chemistry·Katarzyna KiegielStanisław Wołkowicz
Jan 16, 2018·Physical Chemistry Chemical Physics : PCCP·Shuangzhi LiWeikai Liu
Mar 5, 2020·Environmental Science and Pollution Research International·Cheng YuQiaoyun Huang
Sep 25, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jian LiuTianhui Yang
Mar 13, 2021·Journal of Toxicology and Environmental Health. Part B, Critical Reviews·Elida Cristina Monteiro De OliveiraBoscolli Barbosa Pereira
May 16, 2020·Environmental Science & Technology·Qiuyue GeHong Chen

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