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Hierarchical collagen fibers complexed with tannic acid and Fe3+ as a heterogeneous catalyst for enhancing sulfate radical-based advanced oxidation process

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Abstract

Efficient sulfate radical-based advanced oxidation processes (SR-AOPs) are important for treating organic contaminants of industrial wastewater. To achieve this goal, tannic acid (TA)–modified skin collagen fibers (CFs) were prepared for the enhanced immobilization of Fe3+ based on multiple complexation interactions, resulting in a heterogeneous catalyst with more catalytic sites (defined as TA-Fe-CFs) for activating peroxymonosulfate (PMS). During the removal of an organic dye (rhodamine B, RhB) from water, the hierarchical TA-Fe-CFs exhibited excellent adsorption capacity at the early stage before the introduction of PMS, which can be ascribed to the π-π interaction between TA and aromatic RhB. Such improved mass transfer of target contaminants into the catalytic support was proved to be beneficial for improving the utilization efficiency of sulfate radicals in subsequent SR-AOPs. After introducing PMS, the reductive TA moieties of the heterogeneous catalyst were able to accelerate the redox cycle of Fe3+/Fe2+ in Fenton reactions, facilitating the activation of PMS to generate sulfate radicals for the degradation of organic RhB.

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The datasets analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors would also like to thank Dr. Zhonghui Wang for her great help in the using of UV-vis spectrophotometer Hitachi U-3900.

Funding

The research was financially supported by the Key Technology Support Program of Sichuan Province (2021YFG0241); the Opening Project of Key Laboratory of Leather Chemistry and Engineering, Sichuan University, Ministry of Education (SCU2021D005), and the Program of Sichuan University featured research groups in engineering disciplines.

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Gongyan Liu conceived the idea and designed the study. Rui Wang carried out materials preparation and performed the experiments. Rui Wang and Ruiquan Yu analyzed the experiments data. Gongyan Liu and Rui Wang drafted the manuscript. Junchao Wang, Jun Xiang, Chaojian Chen, and Xuepin Liao reviewed and corrected the manuscript. All authors read and approved this manuscript.

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Correspondence to Gongyan Liu.

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The authors declare no competing interests.

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Responsible Editor: Ricardo A. Torres-Palma

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Wang, R., Yu, R., Wang, J. et al. Hierarchical collagen fibers complexed with tannic acid and Fe3+ as a heterogeneous catalyst for enhancing sulfate radical-based advanced oxidation process. Environ Sci Pollut Res 29, 58675–58684 (2022). https://doi.org/10.1007/s11356-022-19907-3

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  • DOI: https://doi.org/10.1007/s11356-022-19907-3

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