Luan Jingfei, Pan Bingcai, Paz Yaron, Li Yongmei, Wu Xiaoshan, Zou Zhigang
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, People's Republic of China.
Phys Chem Chem Phys. 2009 Aug 7;11(29):6289-98. doi: 10.1039/b815260h. Epub 2009 May 21.
Bi(2)SbVO(7) was prepared by solid-state reaction technique for the first time and the structural and photocatalytic properties of Bi(2)SbVO(7) and Bi(2)GaTaO(7) were investigated. The results showed that Bi(2)SbVO(7) crystallized with the tetragonal crystal system by space group I4/mmm. In addition, the band gaps of Bi(2)SbVO(7) and Bi(2)GaTaO(7) were estimated to be 2.33 and 2.52 eV. The photocatalytic degradation of aqueous methylene blue (MB) dye over Bi(2)SbVO(7) and Bi(2)GaTaO(7) was investigated under visible light irradiation. Bi(2)SbVO(7) showed higher catalytic activity compared with Bi(2)GaTaO(7) for MB photocatalytic degradation under visible light irradiation. The photocatalytic MB degradation followed first-order reaction kinetics, the apparent first-order rate constant k being 0.0262 and 0.0060 min(-1) with Bi(2)SbVO(7) and Bi(2)GaTaO(7), respectively. Complete removal of aqueous MB was realized after visible light irradiation for 210 min with Bi(2)SbVO(7) as a catalyst. The reduction of the total organic carbon (TOC), the formation of inorganic products (SO(4)(2-) and NO(3)(-)) and the evolution of CO(2) revealed complete removal of aqueous MB during the photocatalytic process by this novel photocatalyst.
首次采用固态反应技术制备了Bi(2)SbVO(7)，并对Bi(2)SbVO(7)和Bi(2)GaTaO(7)的结构和光催化性能进行了研究。结果表明，Bi(2)SbVO(7)属于四方晶系，空间群为I4/mmm。此外，Bi(2)SbVO(7)和Bi(2)GaTaO(7)的带隙估计分别为2.33和2.52 eV。研究了在可见光照射下Bi(2)SbVO(7)和Bi(2)GaTaO(7)对水溶液中亚甲基蓝（MB）染料的光催化降解。在可见光照射下，Bi(2)SbVO(7)对MB光催化降解的活性高于Bi(2)GaTaO(7)。光催化MB降解遵循一级反应动力学，以Bi(2)SbVO(7)和Bi(2)GaTaO(7)为催化剂时，表观一级速率常数k分别为0.0262和0.0060 min(-1)。以Bi(2)SbVO(7)为催化剂，可见光照射210 min后，水溶液中的MB实现了完全去除。总有机碳（TOC）的降低、无机产物（SO(4)(2-)和NO(3)(-)）的形成以及CO(2)的释放表明，这种新型光催化剂在光催化过程中实现了水溶液中MB的完全去除。
