Kong Lina, Jiang Zhiqiang, Wang Changhua, Wan Fangxu, Li Yingying, Wu Liangzhuan, Zhi Jin-Fang, Zhang Xintong, Chen Shijian, Liu Yichun
†Center for Advanced Optoelectronic Functional Materials Research, and Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, 5268 Renmin Street, Changchun 130024, China.
‡School of Physics, Chongqing University, Shapingba, Chongqing 401331, China.
ACS Appl Mater Interfaces. 2015 Apr 15;7(14):7752-8. doi: 10.1021/acsami.5b00888. Epub 2015 Apr 2.
Doping with impurities as well as introducing oxygen vacancies has been recognized as an important means to enhance photocatalytic activity of TiO2 under visible-light irradiation. Here we report that simple ethanol impregnation followed with mild heat treatment (150-400 °C) can color TiO2 nanoparticles and enhance visible-light photocatalytic activity of the material. The coloration and photocatalytic activity for β-naphthol and rhodamine B (RhB) degradation were observed to be dependent on heat-treatment temperature, and the highest activity as well as the most coloration was obtained at temperatures around 200 to 250 °C. Comprehensive analyses based on X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) investigations as well as first-principle density functional calculation suggest that the simple ethanol impregnation treatment leads to the generation of oxygen vacancy on TiO2 surface which should be responsible for the coloration and enhanced photocatalytic activity.
掺杂杂质以及引入氧空位已被认为是提高TiO₂在可见光照射下光催化活性的重要手段。在此我们报告，简单的乙醇浸渍随后进行温和热处理（150 - 400°C）可以使TiO₂纳米颗粒着色并提高该材料的可见光光催化活性。观察到β - 萘酚和罗丹明B（RhB）降解的着色和光催化活性取决于热处理温度，在200至250°C左右的温度下获得最高活性以及最深颜色。基于X射线光电子能谱（XPS）和电子顺磁共振（EPR）研究以及第一性原理密度泛函计算的综合分析表明，简单的乙醇浸渍处理导致TiO₂表面产生氧空位，这应该是着色和增强光催化活性的原因。
