Akbarzadeh Rokhsareh, Asadi Anvar, Oviroh Peter Ozaveshe, Jen Tien-Chien
Mechanical Engineering Science Department, Faculty of Engineering and the Built Environment, University of Johannesburg, Johannesburg 2006, South Africa.
Research Center for Environmental Determinants of Health (RCEDH), Health Institute, Kermanshah University of Medical Sciences, Kermanshah 67146, Iran.
Materials (Basel). 2019 Jul 18;12(14):2297. doi: 10.3390/ma12142297.
A novel enhanced visible light absorption BiOCl/AgCl/BiVO heterojunction of photocatalysts could be obtained through a one-pot hydrothermal method used with two different pH solutions. There was a relationship between synthesis pH and the ratio of BiOCl to BiVO in XRD planes and their photocatalytic activity. The visible light photocatalytic performances of photocatalysts were evaluated via degradation of diclofenac (DCFF) as a pharmaceutical model pollutant. Furthermore, kinetic studies showed that DCF degradation followed pseudo-first-order kinetics. The photocatalytic degradation rates of BiOCl/AgCl/BiVO synthesized at pH = 1.2 and pH = 4 for DCF were 72% and 47%, respectively, showing the higher activity of the photocatalyst which was synthesized at a lower pH value. It was concluded that the excellent photocatalytic activity of BiOCl/AgCl/BiVO is due to the enhanced visible light absorption formation of a heterostructure, which increased the lifetime of photo-produced electron-hole pairs by creating a heterojunction. The influence of pH during synthesis on photocatalytic activity in order to create different phases was investigated. This work suggests that the BiOCl/AgCl/BiVO p-n heterojunction is more active when the ratio of BiOCl to BiVO is smaller, and this could be achieved simply by the pH adjustment. This is a promising method of modifying the photocatalyst for the purpose of pollutant degradation under visible light illumination.
通过使用两种不同pH值溶液的一锅水热法，可以制备出一种新型的增强可见光吸收的光催化剂BiOCl/AgCl/BiVO异质结。合成pH值与XRD平面中BiOCl与BiVO的比例及其光催化活性之间存在关联。通过降解作为药物模型污染物的双氯芬酸（DCFF）来评估光催化剂的可见光光催化性能。此外，动力学研究表明DCF降解遵循准一级动力学。在pH = 1.2和pH = 4条件下合成的BiOCl/AgCl/BiVO对DCF的光催化降解率分别为72%和47%，表明在较低pH值下合成的光催化剂具有更高的活性。得出结论，BiOCl/AgCl/BiVO优异的光催化活性归因于异质结构增强了可见光吸收，通过形成异质结增加了光生电子 - 空穴对的寿命。研究了合成过程中pH值对光催化活性的影响，以形成不同的相。这项工作表明，当BiOCl与BiVO的比例较小时，BiOCl/AgCl/BiVO p - n异质结更具活性，并且这可以通过简单地调节pH值来实现。这是一种在可见光照射下用于修饰光催化剂以降解污染物的有前景的方法。
