Performance and mechanism of Cr(VI) removal by zero-valent iron loaded onto expanded graphite

Journal of Environmental Sciences (China)
Congbin XuAi-Jun Lin

Abstract

Zero-valent iron (ZVI) was loaded on expanded graphite (EG) to produce a composite material (EG-ZVI) for efficient removal of hexavalent chromium (Cr(VI)). EG and EG-ZVI were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy and Brunauer-Emmett-Teller (BET) analysis. EG-ZVI had a high specific surface area and contained sub-micron sized particles of zero-valent iron. Batch experiments were employed to evaluate the Cr(VI) removal performance. The results showed that the Cr(VI) removal rate was 98.80% for EG-ZVI, which was higher than that for both EG (10.00%) and ZVI (29.80%). Furthermore, the removal rate of Cr(VI) by EG-ZVI showed little dependence on solution pH within a pH range of 1-9. Even at pH11, a Cr(VI) removal rate of 62.44% was obtained after reaction for 1hr. EG-ZVI could enhance the removal of Cr(VI) via chemical reduction and physical adsorption, respectively. X-ray photoelectron spectroscopy (XPS) was used to analyze the mechanisms of Cr(VI) removal, which indicated that the ZVI loaded on the surface was oxidized, and the removed Cr(VI) was immobilized via the formation of Cr(III) hydroxide and Cr(III)-Fe(III) hydroxide/oxyhydroxide on the...Continue Reading

Citations

Oct 3, 2018·International Journal of Environmental Research and Public Health·Fayuan WangYuhuan Sun
Jun 6, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Bowen LiuDefeng Xing
Sep 4, 2019·Environmental Science and Pollution Research International·Yuxuan HeYongming Luo
Sep 8, 2019·Environmental Science and Pollution Research International·Shashikanth GajarajZhiqiang Hu
Jan 10, 2020·Environmental Science and Pollution Research International·Luyao QinAijun Lin
Jun 14, 2020·Environmental Science and Pollution Research International·Xiaoning LiHuining Xiao
Jun 30, 2019·Environment International·Hubdar Ali MaitloJae-Woo Park
Aug 18, 2021·Environmental Science and Pollution Research International·Xi ChenXinyang Xu

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