Ye Nanfei, Wang Jingjing, Yan Xuehua, Sha Dawei, Chen Ming, Zhou Chen, Wang Dongfeng, Yuan Xiaoxue, Cheng Xiaonong, Zu Jiaxing
School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China.
J Nanosci Nanotechnol. 2018 Aug 1;18(8):5485-5492. doi: 10.1166/jnn.2018.15438.
CsxWO3/TiO2 composites with different contents of CsxWO3 were successfully synthesized in this study by a facile hydrothermal process. CsxWO3/TiO2 composites were characterized by XRD, Raman, UV-visible diffuse reflectance spectra (DRS), photoluminescence spectra (PL) and SEM. TiO2 nanoparticles were distributed uniformly on the surface of the CsxWO3 microsphere in the prepared CsxWO3/TiO2 composites, and they formed heterojunctions with CsxWO3. The effect of CsxWO3 on the photoactivities of composites was investigated via DRS and PL. All CsxWO3/TiO2 catalysts showed enhanced photocatalytic activity for degrading rhodamine B under visible light irradiation. The 50% CsxWO3/TiO2 sample showed the best photocatalytic activity and its kinetic constant was 20 times larger than that of TiO2. The possible photocatalytic mechanism is also discussed from the trapping experiments of active species. The improved photocatalytic activity for the CsxWO3/TiO2 catalyst may be attributed to the synergetic effect between CsxWO3 microspheres and TiO2 nanoparticles. This novel photocatalyst can be used to degrade environmental pollutants in the future.
本研究通过简便的水热法成功合成了具有不同CsxWO3含量的CsxWO3/TiO2复合材料。采用X射线衍射（XRD）、拉曼光谱、紫外可见漫反射光谱（DRS）、光致发光光谱（PL）和扫描电子显微镜（SEM）对CsxWO3/TiO2复合材料进行了表征。在制备的CsxWO3/TiO2复合材料中，TiO2纳米颗粒均匀分布在CsxWO3微球表面，并与CsxWO3形成异质结。通过DRS和PL研究了CsxWO3对复合材料光活性的影响。所有CsxWO3/TiO2催化剂在可见光照射下对罗丹明B的降解均表现出增强的光催化活性。50% CsxWO3/TiO2样品表现出最佳的光催化活性，其动力学常数比TiO2大20倍。还从活性物种的捕获实验讨论了可能的光催化机理。CsxWO3/TiO2催化剂光催化活性的提高可能归因于CsxWO3微球与TiO2纳米颗粒之间的协同效应。这种新型光催化剂未来可用于降解环境污染物。
