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The coordination complex formed by oxalic acid and chromate and the mechanism for enhanced photoreduction of Cr(Ⅵ) under visible-light irradiation

Received Date:2024-01-02 Revised Date:2024-01-26 Accepted Date:2024-02-27

DOI:10.20078/j.eep.20240123

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    Abstract:Oxalic acid, which mainly originates from root exudation and plant residue decomposition, is one of the most widely exis... Open+
    Abstract:

    Oxalic acid, which mainly originates from root exudation and plant residue decomposition, is one of the most widely existiug carboxylic acids, and has a dramatic impact on the reduction of chromate in natural waters. In this study, isothermal titration calorimetry (ITC), theoretical calculations, and electrospray ionization high resolution mass spectrometry (ESI-HRMS) analysis revealed that oxalic acid could complex with chromate to form a Cr(Ⅵ)-oxalate complex via an esterification process at pH≤4. The in situ generated HC2CrO7 complex was a visible-light-active species, and visible light could induce electron transfer from the oxalate unit to the Cr(Ⅵ) within the HC2CrO7 complex via a HOMO-LUMO electronic transition, resulting in Cr(Ⅵ) reduction. Subsequently, we verified the Cr(Ⅵ) reduction intermediates, and the hypotoxic Cr(Ⅲ) species [Cr3+-(C2O2-4)3] 3- was the final product. Finally, the pathway of Cr(Ⅵ) reduction by oxalic acid under visible-light irradiation was proposed. This study will provide a theoretical basis for efficient photoreduction of Cr(Ⅵ) pollution using oxalic acid.

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    Authors:

    • GUAN Yingying1
    • WANG Hao2
    • GE Xiaoming2
    • DENG Likai2
    • DENG Bin2
    • MU Yi1,*
    • ZOU Jianping1,*

    Units

    • 1. Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University
    • 2. Department of Security and Protection, Aecc South Industry Company Limited

    Keywords

    • Oxalic acid
    • Cr
    • Photoreduction
    • Heavy metal

    Citation

    GUAN Yingying, WANG Hao, GE Xiaoming, et al. The coordination complex formed by oxalic acid and chromate and the mechanism for enhanced photoreduction of Cr(Ⅵ) under visible-light irradiation[J]. Energy Environmental Protection, 2024, 38(1): 109-118.

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