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首页> 美国卫生研究院文献>Materials >One-Pot Synthesized Visible Light-Driven BiOCl/AgCl/BiVO4 n-p Heterojunction for Photocatalytic Degradation of Pharmaceutical Pollutants
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One-Pot Synthesized Visible Light-Driven BiOCl/AgCl/BiVO4 n-p Heterojunction for Photocatalytic Degradation of Pharmaceutical Pollutants

机译：一锅合成可见光驱动BiOCl / AgCl / BiVO4 n-p异质结对药物污染物的光催化降解

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A novel enhanced visible light absorption BiOCl/AgCl/BiVO4 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 BiVO4 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/BiVO4 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/BiVO4 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/BiVO4 p-n heterojunction is more active when the ratio of BiOCl to BiVO4 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.
机译：通过使用一锅法水热方法与两种不同的pH溶液一起使用，可以获得一种新型的新型增强的可见光吸收BiOCl / AgCl / BiVO4异质结光催化剂。 XRD平面上的合成pH值与BiOCl与BiVO4的比例及其光催化活性之间存在关系。通过双氯芬酸（DCFF）作为药物模型污染物的降解，评估了光催化剂的可见光光催化性能。此外，动力学研究表明DCF降解遵循伪一级动力学。在pH = 1.2和pH = 4时合成的BiOCl / AgCl / BiVO4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较高的活性。结论是，BiOCl / AgCl / BiVO4的出色的光催化活性是由于增强了异质结构的可见光吸收形成，从而通过产生异质结延长了光生电子-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，以产生不同的相。这项工作表明，当BiOCl与BiVO4的比例较小时，BiOCl / AgCl / BiVO4 p-n异质结更具活性，这可以通过调节pH值简单地实现。这是一种有前途的改性光催化剂的方法，目的是在可见光照射下降解污染物。

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