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La2Zr2O7/Bi2Sn2O7 heterostructure for photocatalytic degradation of tetracycline with the aid of hydrogen peroxide under visible light irradiation

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Abstract

Photocatalytic degradation technology serves as an environmental-friendly mean for the removal of organic pollutants in wastewater. La2Zr2O7/Bi2Sn2O7 (LZO/BSO, cata) composite photocatalysts have been successfully fabricated through the in-situ growth approach. The phase composition, microstructure and optical property of the materials have been examined. The results indicate that the "cata + H2O2 + vis" hybrid system exhibites the optimal photocatalytic performance in the photocatalytic degradation process of tetracycline (TC). Under this optimal condition, the degradation rate of TC reaches 90% after 70 min of visible light irradiation. And the apparent rate constant of the "cata + H2O2 + vis" system is obviously higher than those of "H2O2 + vis" and "cata + H2O2″ systems. The main active species have been confirmed to include ·O2−, h+ and ·OH in the degradation process of TC by the "cata + H2O2 + vis” system. The enhanced photocatalytic activity is achieved by improving the separation efficiency of charge carriers in heterojunction structure and producing more active species with the assistance of hydrogen peroxide. The effective Z-scheme-type heterojunction photocatalyst proposed in this study has the potential to be applied in the degradation of organic pollutants in wastewater.

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Funding

This work was supported by Key Research and Development Projects of Shaanxi Province (Grant number [2023-YBGY-502] and [2023KXJ-185]), Science and Technology Projects of Beilin District of Xi'an City in Shaanxi Province (Grant number [GX2318]).

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Xi’an University of Architecture and Technology, Xi’an, 710055, China

    Yao Wang, Boyu Pan, Fan Li, Liang Zhang, Kangkang Wang, Bing Xu & Wenxuan Shi

  2. Northwest Institute for Nonferrous Metal Research, Xi’an, 710016, China

    Shengnan Zhang, Lihua Jin & Jianqing Feng

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  1. Yao Wang
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Boyu Pan, Fan Li, Liang Zhang, Kangkang Wang, Bing Xu, Wenxuan Shi, Shengnan Zhang, Lihua Jin and Jianqing Feng. The first draft of the manuscript was written by Yao Wang, Boyu Pan and Fan Li. And all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Wang, Y., Pan, B., Li, F. et al. La2Zr2O7/Bi2Sn2O7 heterostructure for photocatalytic degradation of tetracycline with the aid of hydrogen peroxide under visible light irradiation. J Mater Sci: Mater Electron 35, 1624 (2024). https://doi.org/10.1007/s10854-024-13360-3

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