World Class University (WCU) Program of Chemical Convergence for Energy & Environment (C2E2), School of Chemical and Biological Engineering, College of Engineering, Seoul National University (SNU), Seoul, Republic of Korea.
J Hazard Mater. 2012 Jun 15;219-220:13-8. doi: 10.1016/j.jhazmat.2011.12.033. Epub 2011 Dec 19.
The titanium dioxide (TiO(2)) nanorod-decorated graphene sheets photocatalysts with different TiO(2) nanorods population have been synthesized by a simple non-hydrolytic sol-gel approach. Electron microscopy and X-ray diffraction analysis indicated that the TiO(2) nanorods are well-dispersed and successfully anchored on the graphene sheet surface through the formation of covalent bonds between Ti and C atoms. The photocatalytic activities are evaluated in terms of the efficiencies of photodecomposition and adsorption of methylene blue (MB) in aqueous solution under visible-light irradiation. The as-synthesized TiO(2) nanorod-decorated graphene sheets showed unprecedented photodecomposition efficiency compared to the pristine TiO(2) nanorods and the commercial TiO(2) (P-25, Degussa) under visible-light. It is believed that this predominant photocatalytic activity is due to the synergistic contribution of both a retarded charge recombination rate caused by a high electronic mobility of graphene and an increased surface area originated from nanometer-sized TiO(2) nanorods. Furthermore, photoelectrochemical study is performed to give deep insights into the primary roles of graphene that determines the photocatalytic activity.
通过简单的非水解溶胶-凝胶法合成了具有不同 TiO2 纳米棒密度的 TiO2 纳米棒修饰的石墨烯片光催化剂。电子显微镜和 X 射线衍射分析表明，TiO2 纳米棒通过 Ti 和 C 原子之间的共价键形成，很好地分散并成功地锚定在石墨烯片表面上。通过评价在可见光照射下，水溶液中亚甲基蓝（MB）的光解和吸附效率来评估光催化活性。与原始 TiO2 纳米棒和商业 TiO2（P-25，Degussa）相比，合成的 TiO2 纳米棒修饰的石墨烯片在可见光下表现出前所未有的光解效率。据信，这种主要的光催化活性归因于石墨烯高电子迁移率导致的电荷复合速率的延迟和源自纳米尺寸 TiO2 纳米棒的表面积的增加的协同贡献。此外，还进行了光电化学研究，以深入了解决定光催化活性的石墨烯的主要作用。
