The development of new composite materials is of great significance to improve the photocatalytic degradation efficiency. In this article, the TiO₂/ZIF-8 composite materials (TZCM) have been designed via the combination of hydrothermal-assisted liquid phase deposition and the simple coprecipitation method. The experimental results indicate that the TiO₂ and ZIF-8 nanoparticles can be tightly bonded together by chemical bonds. Moreover, the TZCM also exhibit a significantly increased specific surface area and a reduced band gap width, which would provide more active sites and realize the visible-light response during the photocatalytic process. The photodegradation rate and the corresponding first-order reaction rate of methylene blue within 24 min by TiO₂/ZIF-8 composite material (e.g., sample TZCM-3) is 93.36% and 0.1376 min⁻¹, which is 31 times and 17 times that of pristine TiO₂ and ZIF-8, respectively. According to the photoelectrochemical experiments, the separation efficiency of photogenerated electrons and holes in TZCM sample during the photocatalytic process could be significantly enhanced.

中文翻译：

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温和条件下增强可见光光催化活性的TiO2/ZIF-8异质结的设计

新型复合材料的开发对于提高光催化降解效率具有重要意义。本文通过水热辅助液相沉积和简单共沉淀法的结合设计了TiO _{2 /ZIF-8复合材料(TZCM)。}实验结果表明TiO ₂和ZIF-8纳米粒子可以通过化学键紧密地结合在一起。此外，TZCM还表现出显着增加的比表面积和减小的带隙宽度，这将提供更多的活性位点并在光催化过程中实现可见光响应。_{TiO 2} /ZIF-8复合材料(如样品TZCM-3)在24 min内对亚甲基蓝的光降解率和相应的一级反应速率分别为93.36%和0.1376 min ^-1，分别是31倍和17倍分别为原始TiO ₂和ZIF-8。根据光电化学实验，光催化过程中TZCM样品中光生电子和空穴的分离效率可以显着提高。