Visible light‐excited surface plasmon resonance charge transfer significantly improves the photocatalytic activities of ZnO semiconductor for pollutants degradation,Journal of the Chinese Chemical Society

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Visible light‐excited surface plasmon resonance charge transfer significantly improves the photocatalytic activities of ZnO semiconductor for pollutants degradation
Journal of the Chinese Chemical Society ( IF 1.6 ) Pub Date : 2020-08-13 , DOI: 10.1002/jccs.202000205
Humaira Yasmeen ₁ , Amir Zada ₂ , Sharafat Ali ₃ , Imran Khan ₃ , Wajid Ali ₃ , Waliullah Khan ₂ , Muhammad Khan ₄ , Natasha Anwar ₂ , Asif Ali ₂ , Ali M. Huerta‐Flores ₅ , Fazle Subhan ₂

Affiliation

To effectively address environmental pollution, we synthesized Au‐loaded ZnO nanocomposites and applied for the photocatalytic degradation of 2‐chlorophenol (2‐CP) under visible light irradiation. The as‐prepared nanophotocatalysts delivered much improved photocatalytic degradation activities as compared to the bare ZnO nanoparticles and 32% of the pollutant was degraded with 2AuZnO in 1 hr. These improved photoactivities are attributed to the extended visible light absorption due to the surface plasmon resonance property of the loaded Au nanoparticles. Moreover, Au nanoparticles played important role in charge separation by inducting excited electrons to the conduction band of ZnO photocatalyst and surface catalysis as confirmed from photoluminescence spectra and amount of the generated hydroxyl radicals. The trapping experiments confirmed that positive holes were the major degrading species during the photocatalytic degradation of 2‐CP. This work provides a feasible way to improve the photocatalysis by introducing a proper amount of noble metals over the surface of semiconductor photocatalysts.

中文翻译：

可见光激发的表面等离子体激元共振电荷转移显着改善了ZnO半导体对污染物降解的光催化活性

为了有效解决环境污染，我们合成了Au负载的ZnO纳米复合材料，并在可见光照射下将其用于光催化降解2-氯苯酚（2-CP）。与裸露的ZnO纳米颗粒相比，所制备的纳米光催化剂提供了改善的光催化降解活性，并且1小时内32％的污染物被2AuZnO降解。这些改善的光活性归因于负载的Au纳米颗粒的表面等离振子共振特性，从而扩展了可见光吸收。此外，Au纳米粒子通过将激发的电子诱导到ZnO光催化剂的导带和表面催化中，在电荷分离中起着重要作用，这由光致发光光谱和所产生的羟基自由基的量证实。捕获实验证实，空穴是2-CP光催化降解过程中的主要降解物种。这项工作通过在半导体光催化剂的表面引入适量的贵金属，提供了一种改善光催化作用的可行方法。

更新日期：2020-09-24

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