Lin Shali, Mi Xiaohu, Xi Lei, Li Jinping, Yan Lei, Fu Zhengkun, Zheng Hairong
School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, China.
Nanomaterials (Basel). 2022 Aug 19;12(16):2863. doi: 10.3390/nano12162863.
Oxide-supported Ag nanoparticles have been widely reported as a good approach to improve the stability and reduce the cost of photocatalysts. In this work, a Ag-nanoparticles-doped porous ZnO photocatalyst was prepared by using metal-organic frameworks as a sacrificial precursor and the catalytic activity over 4-nitrophenol was determined. The Ag-nanoparticles-doped porous ZnO heterostructure was evaluated by UV, XRD, and FETEM, and the catalytic rate constant was calculated by the change in absorbance value at 400 nm of 4-nitrophenol. The photocatalyst with a heterogeneous structure is visible, light-responsive, and beneficial to accelerating the catalytic rate. Under visible light irradiation, the heterostructure showed excellent catalytic activity over 4-nitrophenol due to the hot electrons induced by the localized surface plasmon resonance of Ag nanoparticles. Additionally, the catalytic rates of 4 nm/30 nm Ag nanoparticles and porous/nonporous ZnO were compared. We found that the as-prepared Ag-nanoparticles-doped porous ZnO heterostructure catalyst showed enhanced catalytic performance due to the synergetic effect of Ag nanoparticles and porous ZnO. This study provides a novel heterostructure photocatalyst with potential applications in solar energy and pollutant disposal.
氧化物负载的银纳米颗粒作为一种提高光催化剂稳定性和降低成本的良好方法已被广泛报道。在本工作中，以金属有机框架为牺牲前驱体制备了银纳米颗粒掺杂的多孔氧化锌光催化剂，并测定了其对4-硝基苯酚的催化活性。通过紫外光谱、X射线衍射和场发射透射电子显微镜对银纳米颗粒掺杂的多孔氧化锌异质结构进行了评估，并根据4-硝基苯酚在400 nm处吸光度值的变化计算了催化速率常数。具有异质结构的光催化剂具有可见光响应性，有利于加快催化速率。在可见光照射下，由于银纳米颗粒的局域表面等离子体共振诱导的热电子，该异质结构对4-硝基苯酚表现出优异的催化活性。此外，还比较了4 nm/30 nm银纳米颗粒和多孔/无孔氧化锌的催化速率。我们发现，由于银纳米颗粒和多孔氧化锌的协同效应，所制备的银纳米颗粒掺杂的多孔氧化锌异质结构催化剂表现出增强的催化性能。本研究提供了一种新型异质结构光催化剂，在太阳能和污染物处理方面具有潜在应用。
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