Abstract
A novel layered hexagonal boron nitride/titanium dioxide (h-BN/TiO2) composite photocatalyst has been constructed by anchoring TiO2 nanoflakes on the surface of h-BN flakes via a solvothermal method. The morphology and dispersion of TiO2 can be tuned by controlling the amount of flake h-BN. Benefiting from the unique hetero-structure, the photocatalytic performance of the obtained composite toward rhodamine B (RhB) degradation is greatly enhanced, among which 12 wt% h-BN/TiO2 composites show 3.5 and 6.9 times higher degradation rate than the synthesized TiO2 and commercial TiO2 (P25), respectively, and an excellent cycling stability has also been obtained. Moreover, the first-principles calculation reveals the synergetic catalytic effect between TiO2 and h-BN flake, which is found to be responsible for the significantly enhanced photocatalytic performance of h-BN/TiO2 composites.
摘要
本文采用溶剂热法将纳米二氧化钛 (TiO2) 片固定在六方氮化硼 (h-BN)片表面, 制备了一种新型层状h-BN/TiO2复合光催化剂. 由于其独特的异质结构, 合成的复合材料对罗丹明B(RhB)降解的 光催化性能得到了提高, 其中12 wt% h-BN/TiO2的降解率分别比合成的 TiO和P25高3.5倍和6.9倍, 同时具有良好的循环稳定性. 此 外, 第一原理计算揭示了TiO2与h-BN片之间的协同催化作用, 发现 h-BN的引入对h-BN/TiO2复合材料的光催化性能有显著提高.
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Acknowledgements
This work was supported by the National Natural Science Foundation for Excellent Young Scholars of China (51522402), the National Postdoctoral Program for Innovative Talents (BX20180034), the Fundamental Research Funds for the Central Universities (FRF-TP-18-045A1), and China Postdoctoral Science Foundation (2018M641192).
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Hou X, Chen J, Liang T and Shi J supervised the experiment. Li Q and Yang T proposed the idea. Li Q designed and performed the experiment and wrote the paper. Fang Z contributed to the DFT calculations. Cui X and Hou X revised the paper. All authors contributed to the general discussion.
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Supporting data are available in the online version of the paper.
Qun Li is currently studying for her PhD degree in the University of Science and Technology Beijing, China. Her research focuses on the preparation of materials, electrochemical and adsorption application
Xinmei Hou received her Bachelor’s and Master’s degree from Zhengzhou University, and got her PhD degree from the University of Science and Technology Beijing in 2009. Now she is a full professor of University of Science and Technology Beijing. Her research interests include the preparation of high performance ceramics, high temperature properties and functional applications in such fields of electrochemistry and environment.
Xiangzhi Cui received her PhD degree in 2009 from Shanghai Institute of Ceramics, Chinese Academy of Sciences, and has been working at the institute since then. Her main research interest includes the structural design and synthesis of mesostructured nanocomposites, and the catalytic performances of the materials for applications in fuel cells and environmental protection.
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Li, Q., Hou, X., Fang, Z. et al. Construction of layered h-BN/TiO2 hetero-structure and probing of the synergetic photocatalytic effect. Sci. China Mater. 63, 276–287 (2020). https://doi.org/10.1007/s40843-019-1180-8
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DOI: https://doi.org/10.1007/s40843-019-1180-8