Abstract
Photothermal-assisted photocatalytic degradation of antibiotics is a promising way to alleviate pollutant issues in the environment. Herein, a BiVO4 (BVO)-cobalt phthalocyanine (CoPc) S-scheme heterojunction was constructed by coupling the solvothermal method with sonication, which can facilitate photothermal-assisted photocatalytic tetracycline (TC) removal. The BVO-1% CoPc sample exhibited optimal TC removal efficiency, reaching 76% within 10 min; its apparent rate constant was 1.8 times that of pure BVO. Additionally, BVO-1% CoPc exhibited excellent reusability and stability in cycling experiments. Photoluminescence measurements demonstrated that the S-scheme heterojunction structure improved the charge separation efficiency. Infrared thermography images showed that the increased temperatures of the reaction system can be attributed to the photothermal effect of CoPc. The degradation intermediates and possible degradation pathways of TC were analyzed. Based on active species trapping experiments, in situ X-ray photoelectron spectrometry, and band structures, a possible S-scheme photocatalytic charge transfer mechanism for BVO-CoPc was reasonably proposed. This study provides a feasible strategy to construct an S-scheme heterojunction system with photothermal assistance for the practical removal of organic pollutants.
摘要
光热催化降解去除污染物对解决环境问题具有独特的优势. 本 文通过水热法结合超声处理的方法合成了BiVO4/CoPc S型异质结光热 催化材料. 实验结果表明, BVO-1% CoPc在10分钟内对四环素对降解率 可达76%, 相比钒酸铋单质提高了1.8倍. 进一步的红外热成像仪表明酞 菁钴(CoPc)的光热效应可以提高反应体系的温度. 同时, 研究人员还发 现降解后的中间产物毒性显著降低. 光致发光光谱的结果表明, 合成的 复合材料可以增强光生载流子的分离能力. 基于捕获实验、能带结构 和原位XPS等研究结果, 我们提出了光生电荷在合成的催化剂中的S型 传输机制. 本工作为设计和开发用于去除有机污染物的S型光热催化材 料提供了一种可行的策略.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (22172064) and the National Laboratory of Solid State Microstructures, Nanjing University (M34047). Prof. Haifeng Shi is indebted to the financial support from the Qing Lan Project of Jiangsu Province.
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Author contributions Long Z and Shi H designed the experiments; Long Z and Zheng X performed the experiments and characterizations; Long Z and Shi H wrote the paper; Shi H supervised the study. All authors contributed to the general discussion.
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Supplementary information Experimental details and supporting data are available in the online version of the paper.
Ziyang Long is a graduate student at the School of Science, Jiangnan University. His research interest focuses on nanoscale materials and photocatalysis.
Haifeng Shi received his PhD degree in 2009 from Nanjing University. Currently, he is working as a full professor at Jiangnan University. His research mainly focuses on developing photocatalysts for H2 generation, CO2 conversion and decomposing organic pollutants.
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Long, Z., Zheng, X. & Shi, H. Construction of BiVO4/CoPc S-scheme heterojunctions with enhanced photothermal-assisted photocatalytic activity. Sci. China Mater. 67, 550–561 (2024). https://doi.org/10.1007/s40843-023-2773-9
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DOI: https://doi.org/10.1007/s40843-023-2773-9