As a new type of organic pollutant, benzotriazole seriously threatens the ecological environment and human health. In recent years, semiconductor photocatalytic technology has been widely used in the field of photocatalytic degradation of organic pollutants, but there are still few studies on the degradation of benzotriazole, and the degradation efficiency needs to be improved. In this paper, PtCl₂ was applied in the field of photocatalysis for the first time, and it was loaded on Ta₂O₅ nanosheets to prepared a novel heterojunction photocatalyst Ta₂O₅/PtCl₂ nanosheets by chemical vapor deposition method. The study found that Ta₂O₅/PtCl₂ nanosheets has excellent visible light absorption capacity due to its local surface plasma resonance (LSPR) effect. Ta₂O₅/PtCl₂ nanosheets achieves the best degradation effect when the mass ratio of Ta₂O₅ and PtCl₂ is 1:1, it can remove about 99% of rhodamine B (5 mg/L) in 30 min and 94% of benzotriazole (10 mg/L) in 120 min, and corresponding apparent first-order kinetic constants are 1.06 * 10⁻¹ (min⁻¹) and 2.11 * 10⁻² (min⁻¹), respectively. Moreover, the photocatalytic degradation results are also supported by the photoelectric performance test. Finally, the electrons transfer process and mechanism of photocatalytic degradation of organic pollutants are also speculated. These studies provide new design ideas for the preparation of new heterojunction photocatalysts, which have broad research and development prospects.

苯并三唑作为一种新型有机污染物，严重威胁着生态环境和人类健康。近年来，半导体光催化技术在有机污染物的光催化降解领域得到广泛应用，但对苯并三唑的降解研究还很少，降解效率有待提高。本文首次将PtCl ₂应用于光催化领域，将其负载在Ta ₂ O ₅纳米片上，采用化学气相沉积法制备了新型异质结光催化剂Ta ₂ O ₅ /PtCl ₂纳米片。研究发现，Ta ₂ O ₅/PtCl ₂纳米片由于其局部表面等离子体共振（LSPR）效应而具有优异的可见光吸收能力。Ta ₂ O ₅ /PtCl ₂纳米片在Ta ₂ O ₅与PtCl ₂的质量比为1:1时降解效果最佳，30 min内可去除约99%的罗丹明B（5 mg/L），94 120 分钟内苯并三唑 (10 mg/L) 的百分比，相应的表观一级动力学常数为 1.06 * 10 ^-1 (min ^-1 ) 和 2.11 * 10 ^-2 (min ^-1）， 分别。此外，光电性能测试也支持光催化降解结果。最后，还推测了光催化降解有机污染物的电子转移过程和机理。这些研究为制备新型异质结光催化剂提供了新的设计思路，具有广阔的研究和发展前景。