Abstract：
In recent years, the removal organic pollutants from wastewater by advanced oxidation processes, especially photocatalysis, has become a meaningful approach due to its eco-friendliness and low cost. Herein, staggered type-II Bi2WO6/WO3 heterojunction photocatalysts were prepared by a facile hydrothermal route and investigated by modern physicochemical methods (X-ray diffraction, scanning electron microscopy, low-temperature nitrogen adsorption-desorption, and diffuse reflectance spectroscopy). The optimized BWOW-5 photocatalyst exhibited a H2O2-assisted photocatalytic methylene blue removal efficiency of 94.1% (k = 0.01414 min-1) within 180 min under optimal reaction conditions, which is much higher than that of unmodified Bi2WO6 and WO3 due to efficient separation of the photogenerated charge carriers. The trapping experiments demonstrated that photogenerated hydroxyl radicals and holes play a key role in the photodegradation reaction. Moreover, the optimized BWOW-5 heterojunction photocatalyst exhibited excellent activity in the H2O2-assisted degradation of other pollutants, namely phenol, isoniazid, levofloxacin, and dibenzothiophene with the removal rate of 63.1, 73.6, 95.0, and 72.4%, respectively. This investigation offers a design strategy for Bi2WO6-based multifunctional photocatalytic composites with improved activity for organic pollutant degradation.
摘要：
近年来,通过高级氧化工艺去除废水中的有机污染物，尤其是光催化,由于其生态友好性和低成本，已成为一种有意义的方法。在这里，交错II型Bi2WO6/WO3异质结光催化剂是通过简单的水热途径制备的，并通过现代物理化学方法进行了研究（X射线衍射，扫描电子显微镜，低温氮气吸附-脱附,和漫反射光谱)。在最佳反应条件下，优化的BWOW-5光催化剂在180min内表现出H2O2辅助的光催化亚甲基蓝去除效率为94.1％（k=0.01414min-1），由于光生电荷载流子的有效分离，其远高于未改性的Bi2WO6和WO3。捕获实验表明，光生羟基自由基和空穴在光降解反应中起关键作用。此外，优化的BWOW-5异质结光催化剂在H2O2辅助降解其他污染物方面表现出优异的活性，即苯酚,异烟肼,左氧氟沙星,和二苯并噻吩的去除率分别为63.1、73.6、95.0和72.4％，分别。这项研究为基于Bi2WO6的多功能光催化复合材料提供了一种设计策略，该复合材料具有改善的有机污染物降解活性。
