Nb 掺杂 BiWO₄ 中氧空位调控以增强可见光光催化活性
Oxygen vacancy regulation in Nb-doped BiWO for enhanced visible light photocatalytic activity.
作者信息
Chen Hao, Zhang Changteng, Pang Ya, Shen Qianhong, Yu Yang, Su Yuxuan, Wang Jiabang, Zhang Fang, Yang Hui
机构信息
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University Hangzhou P. R. China 310027
Zhejiang-California International NanoSystems Institute, Zhejiang University Hangzhou P. R. China 310058.
出版信息
RSC Adv. 2019 Jul 22;9(39):22559-22566. doi: 10.1039/c9ra02862e. eCollection 2019 Jul 17.
Novel Nb-doped BiWO nanosheets have been successfully synthesized by a simple hydrothermal method. XRD, Raman spectra, XPS and SEM were adopted to analyze the structure and morphology of the samples, then the structure-dependent optical properties, photoelectric behavior and photocatalytic activities were investigated, and the structure-property relationship was also discussed. The results show that doping Nb can increase the oxygen vacancies in the BiWO lattice and reduce the optical band gap of BiWO. The oxygen vacancies also act as electron traps, which promote the separation of photogenerated carriers. Hence, compared with the pure BiWO, the as-prepared Nb-doped BiWO nanosheets exhibit enhanced visible-light photocatalytic activity for removing contaminants in water such as rhodamine B and tetracycline.
通过一种简单的水热法成功合成了新型铌掺杂的铋钨纳米片。采用X射线衍射（XRD）、拉曼光谱、X射线光电子能谱（XPS）和扫描电子显微镜（SEM）对样品的结构和形貌进行分析，进而研究其结构依赖的光学性质、光电行为和光催化活性，并讨论结构与性能的关系。结果表明，掺杂铌可增加铋钨晶格中的氧空位并减小铋钨的光学带隙。氧空位还作为电子陷阱，促进光生载流子的分离。因此，与纯铋钨相比，所制备的铌掺杂铋钨纳米片对去除水中污染物如罗丹明B和四环素表现出增强的可见光光催化活性。
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