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Mechanism of Ag-enhanced CuBi2O4 inactivation of Escherichia coli in a photocatalytic Fenton system

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Abstract

In this work, Ag/CuBi2O4 composite photocatalyst films with excellent photocatalytic sterilization properties were prepared by photodeposition. The photocatalytic activity of silver-modified CuBi2O4 (Ag/CuBi2O4) under the photocatalytic-Fenton coupling system was verified by its inactivation rate of Escherichia coli in seawater. The results showed that the photocatalytic sterilizing performance of CuBi2O4 loaded with Ag in the presence of trace amounts of H2O2 was significantly improved. 15Ag/CuBi2O4 possessed the optimal photocatalytic activity, and its sterilizing rate in 30 min could reach 96.6%. Its sterilization rate in 30 min could reach 96.6%, which is about 70% higher than that of pure CuBi2O4. Meanwhile, the mechanism of the enhanced sterilization performance of Ag/CuBi2O4 in the photocatalytic-Fenton coupled system was investigated. Firstly, according to the electrochemical results, the loading of Ag can significantly improve the charge separation efficiency of CuBi2O4. And promotes the conversion of H2O2 to hydroxyl radicals(·OH); Secondly, the valence band potential of 15Ag/CuBi2O4 is more positive than that of CuBi2O4, which suggests that Ag loading can enhance the oxidation of CuBi2O4 cavities. Comprehensive radical trapping experiments demonstrate that ·OH and holes (h+) are the main active species for inactivating Escherichia coli (E. coli). In this work, effective conversion of H2O2 to ·OH in a wide spectral range was achieved by loading Ag nanoparticles on the surface of CuBi2O4, which provides a new idea for the development of photocatalytic-Fenton coupling technology and ballast water treatment.

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Funding

This work is supported by the National Natural Science Foundation of China (Grant Nos. 52271340, 51879018).

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  1. Key Laboratory of Ship-Machinery Maintenance and Manufacture for Ministry of Transport, Dalian MaritimeUniversity, Dalian, 116026, People’s Republic of China

    Wanchun Wang, Yangxu Chi, Jiahong Sun, Feng Zhou & Su Zhan

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Wang, W., Chi, Y., Sun, J. et al. Mechanism of Ag-enhanced CuBi2O4 inactivation of Escherichia coli in a photocatalytic Fenton system. Reac Kinet Mech Cat 137, 1225–1238 (2024). https://doi.org/10.1007/s11144-024-02569-2

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