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Dual Z-scheme Bi3TaO7/Bi2S3/SnS2 photocatalyst with high performance for Cr(VI) reduction and TC degradation under visible light irradiation

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Abstract

Ternary direct dual Z-scheme Bi3TaO7/Bi2S3/SnS2 photocatalyst was successfully prepared by hydrothermal method. The composite photocatalysts exhibited high photocatalytic performance on both Cr(VI) reduction and tetracycline (TC) degradation under the irradiation of visible light. The results manifested that the photogenerated charge transfer efficiency was improved after forming the dual Z-scheme heterojunction. As a result, the composite catalysts exhibited higher photocatalytic degradation efficiency than the corresponding single samples. The apparent rate constant (k) value of the best sample BBS-3 for TC degradation was 0.0403 min−1, which was 40 times, 8 times, and 18 times higher than that of single samples. While the k value of BBS-3 for the Cr(VI) reduction was 0.0249 min−1, it was about 23 times, 7 times, and 18 times that of single catalysts. Recycle experiments indicated that the BBS-3 had good photocatalytic stability. Meanwhile, the possible mechanism on Cr(VI) reduction and TC degradation was proposed based on the experimental results.

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摘要

采用水热法制备了三元直接双Z型Bi3TaO7/Bi2S3/SnS2光催化剂。复合光催化剂在可见光照射下对Cr(VI)的还原和TC的降解均表现出良好的光催化性能。结果表明, 形成双Z型异质结后, 光生电荷转移效率得到了提高。结果表明, 复合催化剂的光催化降解效率高于相应的单一样品。最佳样品BBS-3氧化TC的表观速率常数k值为0.0403 min-1, 比相应的单一样品分别高40倍、8倍和18倍。而BBS-3对Cr(VI)还原的k值为0.0249 min-1, 约为单一催化剂的23倍、7倍和18倍。重复实验表明, BBS-3具有良好的光催化稳定性。同时, 根据实验结果提出了Cr(VI)还原和TC氧化的可能机理。

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51978342), the Open Fund of Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle (No. ES201980195), and a project from the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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  1. Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing, 210044, China

    Jing-Jing Xu, Hao-Yu Gu, Min-Dong Chen, Xue-Ping Li & Hong-Wen Zhao

  2. Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing, 210044, China

    Jing-Jing Xu, Hao-Yu Gu, Min-Dong Chen, Xue-Ping Li & Hong-Wen Zhao

  3. Jiangsu Engineering Technology Research Center of Environmental Cleaning Materials, Nanjing, 210044, China

    Jing-Jing Xu, Hao-Yu Gu, Min-Dong Chen, Xue-Ping Li & Hong-Wen Zhao

  4. School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, 210044, China

    Jing-Jing Xu, Hao-Yu Gu, Min-Dong Chen, Xue-Ping Li & Hong-Wen Zhao

  5. Nanyang Technological University, Singapore, 639798, Singapore

    Hong-Bin Yang

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Xu, JJ., Gu, HY., Chen, MD. et al. Dual Z-scheme Bi3TaO7/Bi2S3/SnS2 photocatalyst with high performance for Cr(VI) reduction and TC degradation under visible light irradiation. Rare Met. 41, 2417–2428 (2022). https://doi.org/10.1007/s12598-022-01988-1

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