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Yuanyuan Hu, Jun Mao, Yichun Xue, Zhanlong Tan, Fei Xue, Yuqian Yang, Lei Wang, Hongxiang Zhu, Hui He. Tailoring a photoreactive biomass-based redox coupled material for interaction enhanced removal of Cr(Ⅵ) and As(Ⅲ). Green Energy&Environment. doi: 10.1016/j.gee.2025.12.007
Citation: Yuanyuan Hu, Jun Mao, Yichun Xue, Zhanlong Tan, Fei Xue, Yuqian Yang, Lei Wang, Hongxiang Zhu, Hui He. Tailoring a photoreactive biomass-based redox coupled material for interaction enhanced removal of Cr(Ⅵ) and As(Ⅲ). Green Energy&Environment. doi: 10.1016/j.gee.2025.12.007
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Tailoring a photoreactive biomass-based redox coupled material for interaction enhanced removal of Cr(Ⅵ) and As(Ⅲ)

doi: 10.1016/j.gee.2025.12.007

  • Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, School of Light Industry and Food Engineering, Guangxi University, Nanning, 530004, China

Funds:

This work was supported by the National Natural Science Foundation of China (22368009, 22368010, 22168008, 22378085), the Guangxi Natural Science Foundation (2024GXNSFDA010053), the Natural Science and Technology Innovation Development Doubling Plan of Guangxi University (2023BZJL026), the Technology Development Project of Guangxi Bossco Environmental Protection Technology Co., Ltd (202100039, 202100041).

  • Received date 27 June 2025, Accepted date 11 December 2025, RevRecd date 23 October 2025, Available online 18 December 2025
    Abstract
  • Reduction and complete removal of chromium (VI) and arsenic (III) are crucial for the purification of heavy metal-contaminated wastewater. Here, a photo-responsive eucalyptus-based adsorption-catalytic material was engineered by anchoring polyethyleneimine, porous carbon, and iron oxide onto eucalyptus. The material featured a high density of amino and Fe(Ⅱ)/Fe(Ⅲ), the ability to generate free radicals and heat upon light irradiation. High toxicity Cr(Ⅵ) and As(Ⅲ) in water were adsorbed onto the material while catalytically converted into less toxic Cr(Ⅲ) and As(Ⅴ) under light conditions. Notably, the valence cycling of Fe(Ⅱ) and Fe(Ⅲ) during the adsorption process played a critical role in facilitating the redox reactions converting Cr(Ⅵ) to Cr(Ⅲ) and As(Ⅲ) to As(Ⅴ). Furthermore, the preferential Cr(Ⅵ) adsorption on the material generated reactive sites for As(Ⅲ) oxidation, accelerating arsenic adsorption. Consequently, the eucalyptus-based adsorption-conversion material was capable of completely removing 100.0 mg·L-1 of Cr(Ⅵ) and As(Ⅲ), achieving over 95% conversion to the less toxic forms. This work elucidated the synergistic mechanisms underlying the adsorption-conversion processes of Cr(Ⅵ) and As(Ⅲ), providing novel insights into the material design of substances with synergistic and competing functionalities.

     

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