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Research Article

Efficient removal of natural organo-chromium(III) through self-circulating decomplex and immobilization with nanoscale zero-valent iron

Zhicheng Dong1,2,3Yunyun Xu4Can Wu3Jin Chao1,2Chen Tian1,2( )Zhang Lin1,2,4
School of Metallurgy and Environment, Central South University, Changsha 410083, China
Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China
College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China
School of Environment and Energy, The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters (Ministry of Education), South China University of Technology, Guangzhou 510006, China
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Graphical Abstract

This work demonstrates a novel method for natural organo-chromium(III) (NOCr) removal with nano zero-valent iron (nZVI). The removal process included three stages of adsorption, decomplexation, and re-immobilization. nZVI showed a high Cr removing efficiency of 99.4% under ambient conditions, which is expected to improve the efficiency of removing NOCr from the environment.

Abstract

Organo-chromium(III) complex is one of the chromium contaminant species, which would transform to high-toxic Cr(VI) during migrating in the environment. Such natural organo-chromium(III) (NOCr) is difficult to remove by traditional degradation or precipitation methods, due to its high stability and solubility. Herein, we demonstrated a novel NOCr removing method by transforming it to certain structures similar to Cr-Fe minerals in nature, through a self-circulating decomplex and immobilization mechanism with nano zero-valent iron (nZVI). Taking chromium glycinate (Cr-Gly) as a probe, nZVI showed a high Cr removal efficiency of 99.4% under ambient conditions. The removal process included three stages of adsorption, decomplexation, and re-immobilization. Cr-Gly was first adsorbed on the surface of nZVI by chemisorption of the oxide shell. Then, the adsorbed Cr-Gly was decomplexed and oxidized to Cr(VI) by ·OH and 1O2, which were generated from molecular oxygen activated by nZVI. Meanwhile, the released Cr(VI) could be in-situ adsorbed and re-reduced to Cr(III), which was further immobilized in form of Cr-O-Fe complex. As the Cr-O-Fe complexing structure was similar to that of Cr-Fe minerals (such as chromohercynite) in nature, this work explored a novel and efficient NOCr removing method that was potential to weaken chromium pollution in the environment.

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12274_2023_6028_MOESM1_ESM.pdf (2 MB)
Nano Research
Pages 364-371
Cite this article:
Dong Z, Xu Y, Wu C, et al. Efficient removal of natural organo-chromium(III) through self-circulating decomplex and immobilization with nanoscale zero-valent iron. Nano Research, 2024, 17(1): 364-371. https://doi.org/10.1007/s12274-023-6028-9
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Received: 20 May 2023
Revised: 16 July 2023
Accepted: 19 July 2023
Published: 30 August 2023
© Tsinghua University Press 2023
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