Li Danzhen, Chen Zhixin, Chen Yilin, Li Wenjuan, Huang Hanjie, He Yunhui, Fu Xianzhi
Research Institute of Photocatalysis, State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University, Fuzhou, 350002, PR China.
Environ Sci Technol. 2008 Mar 15;42(6):2130-5. doi: 10.1021/es702465g.
The bifunctional photocatalyst Pt/TiO2-xNx has been successfully prepared by wet impregnation. The properties of Pt/ TiO2-xNx have been investigated by diffuse reflectance spectra, X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, a photoluminescence technique with terephthalic acid, and electric field induced surface photovoltage spectra. The photocatalytic activity of the sample was evaluated by the decomposition of volatile organic pollutants (VOCs) in a H2-O2 atmosphere under visible light irradiation. The results demonstrated that nitrogen-doped and platinum-modified TiO2 in a H2-O2 atmosphere could enormously increase the quantum efficiency of the photocatalytic system with excellent photocatalytic activity and high catalytic stability. The increased quantum efficiency can be explained by enhanced separation efficiency of photogenerated electron-hole pairs, higher interface electron transfer rate, and an increased number of surface hydroxyl radicals in the photocatalytic process. A mechanism was proposed to elucidate the degradation of VOCs over PtTiO(2-x)Nx in a H2-O2 atmosphere under visible light irradiation.
通过湿浸渍法成功制备了双功能光催化剂Pt/TiO2-xNx。利用漫反射光谱、X射线衍射、透射电子显微镜、X射线光电子能谱、对苯二甲酸光致发光技术以及电场诱导表面光电压光谱对Pt/TiO2-xNx的性能进行了研究。通过在可见光照射下H2-O2气氛中挥发性有机污染物（VOCs）的分解来评估样品的光催化活性。结果表明，在H2-O2气氛中氮掺杂和铂改性的TiO2可以极大地提高光催化系统的量子效率，具有优异的光催化活性和高催化稳定性。量子效率的提高可以用光生电子-空穴对的分离效率增强、界面电子转移速率更高以及光催化过程中表面羟基自由基数量增加来解释。提出了一种机制来阐明在可见光照射下H2-O2气氛中PtTiO(2-x)Nx上VOCs的降解过程。
