Li Yong, Liu Yanfang, Zhang Mingqing, Zhou Qianyu, Li Xin, Chen Tianlu, Wang Shifeng
Department of Physics, and Innovation Center of Materials for Energy and Environment Technologies, College of Science, Tibet University, Lhasa 850000, China.
Institute of Oxygen Supply, Center of Tibetan Studies (Everest Research Institute), Tibet University, Lhasa 850000, China.
Molecules. 2021 Nov 19;26(22):6987. doi: 10.3390/molecules26226987.
Photocatalytic degradation, as an emerging method to control environmental pollution, is considered one of the most promising environmental purification technologies. As Tibet is a region with some of the strongest solar radiation in China and even in the world, it is extremely rich in solar energy resources, which is ideal for applying photocatalytic technology to its ecological environment protection and governance. In this study, NaTiO nanobelts were prepared via a hydrothermal method and converted to TiO∙xHO ion exchange, which was followed by high-temperature calcination to prepare TiO(B) nanobelts ("B" in TiO(B) means "Bronze phase"). A simple in situ method was used to generate AgPO particles on the surface of the TiO nanobelts to construct a AgPO/TiO(B) heterojunction composite photocatalyst. By generating AgPO nanoparticles on the surface of the TiO(B) nanobelts to construct heterojunctions, the light absorption range of the photocatalyst was successfully extended from UV (ultraviolet) to the visible region. Furthermore, the recombination of photogenerated electron-hole pairs in the catalyst was inhibited by the construction of the heterojunctions, thus greatly enhancing its light quantum efficiency. Therefore, the prepared AgPO/TiO(B) heterojunction composite photocatalyst greatly outperformed the TiO(B) nanobelt in terms of photocatalytic degradation.
光催化降解作为一种新兴的环境污染控制方法，被认为是最具前景的环境净化技术之一。由于西藏是中国乃至世界上太阳辐射最强的地区之一，其太阳能资源极为丰富，这为将光催化技术应用于其生态环境保护和治理提供了理想条件。在本研究中，通过水热法制备了NaTiO纳米带，并通过离子交换将其转化为TiO∙xHO，随后进行高温煅烧以制备TiO(B)纳米带（TiO(B)中的“B”表示“青铜相”）。采用一种简单的原位方法在TiO纳米带表面生成AgPO颗粒，以构建AgPO/TiO(B)异质结复合光催化剂。通过在TiO(B)纳米带表面生成AgPO纳米颗粒来构建异质结，成功地将光催化剂的光吸收范围从紫外光扩展到了可见光区域。此外，异质结的构建抑制了催化剂中光生电子-空穴对的复合，从而大大提高了其光量子效率。因此，所制备的AgPO/TiO(B)异质结复合光催化剂在光催化降解方面大大优于TiO(B)纳米带。
