Combining a super photoresponsive BiVO₄ catalyst to the large band gap TiO₂ material seems to be a great interest in order to improve the visible-light-driven photodegradation of hazardous pollutants. BiVO₄/TiO₂ heterojunction composites have been synthesized via a simple one-pot hydrothermal route. Herein, we carefully highlighted the effect of BiVO₄ content on the physicochemical and photocatalytic properties of solids towards the decomposition of methylene blue (MB) under solar light irradiation. The main results revealed that the formation of the heterostructures catalyst by incorporating BiVO₄ into TiO₂ stabilizes the anatase phase of TiO₂ by inhibiting its crystal growth and improves significantly the light absorbance of titanium dioxide. The results showed that the best photocatalytic performance is assigned to the catalyst with 2 wt% BiVO₄ loading which is higher than both pure BiVO₄ and TiO₂. This improvement of photocatalytic activity is related to the synergetic effect between both materials. Furthermore, the constructed junction leads to an increase in the concentration of oxygen defects on the semiconductor surface which could create an acceptor energy level into the valence band of TiO₂. Four cyclic runs for the photocatalytic degradation of MB on BiVO₄/TiO₂ composite revealed its stability and sustainable reusability.

中文翻译：

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表面位点缺陷对BiVO4 / TiO2异质结光催化性能增强亚甲基蓝降解的影响

为了改善可见光驱动的有害污染物的光降解，将超光响应性BiVO ₄催化剂与大带隙TiO ₂材料组合在一起似乎引起了人们的极大兴趣。BiVO ₄ / TiO ₂异质结复合材料是通过简单的一锅水热法合成的。在这里，我们仔细强调了BiVO ₄含量对固体在日光照射下对亚甲基蓝（MB）分解的物理化学和光催化性能的影响。主要研究结果显示，该异质结构的催化剂通过将BiVO形成₄成的TiO ₂稳定TiO 2的锐钛矿相₂通过抑制其晶体生长并显着提高二氧化钛的光吸收率。结果表明，最佳的光催化性能被赋予具有2 wt％BiVO ₄负载的催化剂，该负载比纯BiVO ₄和TiO _2都高。光催化活性的这种改善与两种材料之间的协同作用有关。此外，构造的结导致半导体表面上的氧缺陷浓度增加，这可能在TiO ₂的价带中产生受体能级。在BiVO ₄ / TiO ₂上光催化降解MB的四个循环运行 复合材料显示出其稳定性和可持续的可重复使用性。