石墨烯薄膜修饰TiO_2纳米管光电极制备及性能  

Preparation and performance of graphene film decorated TiO_2 nano-tubes photoelectrode

作　　者：程修文[1] 刘惠玲[1] 王璞[1] 陈清华[1] 张健[1] 

机构地区：[1]哈尔滨工业大学市政环境工程学院,城市水资源与水环境国家重点实验室,哈尔滨150090

出　　处：《哈尔滨工业大学学报》2014年第6期30-33,共4页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(51178138);国家创新团队资助项目(51121062);城市水资源与水环境国家重点实验室(哈尔滨工业大学)资助项目(2010DX03;QA201416)

摘　　要：为提高TiO2光催化剂的可见光催化活性,采用阳极氧化法制备了高度有序的TiO2纳米管,利用阳极电化学沉积构筑了石墨烯薄膜修饰的TiO2纳米管光电极,并利用扫描电子显微镜、X-射线光电子能谱及紫外-可见漫反射光谱对其表观形貌、组成结构及光吸收性能进行表征.结果表明:石墨烯有效地修饰在TiO2纳米管表面,且以透明薄膜形式存在.此外,石墨烯薄膜修饰显著拓展了TiO2纳米管的可见光响应范围.以甲基蓝为探针分子,考察了阳极沉积电压及沉积时间对所制备石墨烯薄膜/TiO2纳米管光电极光催化性能的影响.结果表明:阳极沉积电压为+0.8V、沉积时间为10min时,制备的石墨烯薄膜/TiO2纳米管光电极对甲基蓝的光催化降解效果最佳.模拟太阳光下光照120 min对甲基蓝的降解率为65.9%,是纯TiO2纳米管光电极的1.35倍.To improve the visible light photocatalytic （PC） activity of TiO2 photocatalyst, the well-aligned TiO2 nano-tubes （TiO2 NTs） were in-situ grown by anodization of Ti foils, and the graphene film was anodic electrodeposited onto the aforementioned TiO2 NTs to constructed graphene film decorated TiO2 NTs （GF/TiO2 NTs） photoelectrode. Apparent morphology, surface composition and light absorption ability of the resulting photoelectrodes were characterized by scanning electron microscopy （ SEM ）, X-ray photoelectron spectroscopy （XPS） and UV-visible light diffuse reflection spectroscopy （UV-vis DRS）. It was found that the graphene were successfully decorated onto the surface of TiO2 NTs electrode, and existed as the transparent film. In addition, the light absorption of GF/TiO2 NTs photoelectrode was greatly red-shifted to visible light region. Furthermore, the methyl blue （MB） was served as the probing molecules, and the effects of deposition voltage and deposition time on the PC performances were mainly investigated. It was found that when the deposition voltage and applied time were ＋0. 8 V and 10 min, respectively, the optimal photodecomposition of MB could be obtained. Under the simulated sunlight irradiation within 120 min, the 65.9% degradation rate of MB could be achieved, which was 1.35 time larger than that of pristine TiO2 NTs photoelectrode.

关 键 词：石墨烯薄膜 TIO2纳米管 光电极 光催化 甲基蓝 

分 类 号：O643[理学—物理化学] O644[理学—化学]