State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai, 200050, PR China.
Phys Chem Chem Phys. 2011 Feb 21;13(7):2887-93. doi: 10.1039/c0cp01749c. Epub 2010 Dec 16.
Graphene possesses excellent conductivity, adsorptivity, and controllability. The combination of photocatalysts and graphene will introduce these properties of graphene into photocatalysis. In this paper, graphene oxide-Bi(2)WO(6) composite was firstly prepared via in situ hydrothermal reaction in the presence of graphene oxide, then the graphene oxide was reduced by ethylene glycol and the graphene-Bi(2)WO(6) (G-BWO) composite was formed. The as-prepared graphene-Bi(2)WO(6) photocatalyst shows enhanced photocatalytic activity for the degradation of rhodamine B (RhB) under visible light (λ > 420 nm). The electronic interaction and charge equilibration between graphene and Bi(2)WO(6) lead to the shift of the Fermi level and decrease the conduction band potential, which has an important influence on the photocatalytic process. The enhanced photocatalytic activity could be attributed to the negative shift in the Fermi level of G-BWO and the high migration efficiency of photoinduced electrons, which may suppress the charge recombination effectively.
石墨烯具有优异的导电性、吸附性和可控性。将光催化剂与石墨烯结合，会将石墨烯的这些特性引入到光催化中。本文首先通过在氧化石墨烯存在的条件下进行原位水热反应，制备了氧化石墨烯- Bi(2)WO(6)复合材料，然后通过乙二醇还原氧化石墨烯，形成了石墨烯- Bi(2)WO(6) (G-BWO)复合材料。所制备的石墨烯- Bi(2)WO(6)光催化剂在可见光（λ > 420nm）下对罗丹明 B（RhB）的降解表现出增强的光催化活性。石墨烯和 Bi(2)WO(6)之间的电子相互作用和电荷平衡导致费米能级的移动和导带势的降低，这对光催化过程有重要影响。增强的光催化活性可以归因于 G-BWO 的费米能级的负位移和光生电子的高迁移效率，这可能有效地抑制了电荷复合。
