镶嵌Pt的二氧化钛纳米管的合成及其光催化性能研究  

Fabrication and Photocatalytic Activity of Pt-Inserted Titania Nanotubes

作　　者：李海龙[1] 罗武林[1] 田文宇[1] 陈涛[1] 黎春[1] 孙茂[1] 朱地[1] 刘冉冉[1] 赵宇亮[2] 刘春立[1] 

机构地区：[1]北京分子科学国家实验室,北京大学化学与分子工程学院,北京100871 [2]中国科学院高能物理研究所,核分析技术开放重点实验室及国家纳米中心-高能物理研究所纳米生物效应联合实验室,北京100049

出　　处：《光谱学与光谱分析》2009年第6期1623-1626,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(104901802,0471005,10775008);教育部博士点基金项目(20060001032);国防科工委军工遗留专项基金项目(科工计[2007]840);国家大学生创新训练计划项目资助

摘　　要：以金红石相二氧化钛(Ti O2)粉体为原料,采用水热法合成了二氧化钛纳米管(Titania nanotubes,简写为TNTs),然后把H2PtCl6的无水乙醇溶液引入到TNTs中,得到镶嵌Pt的二氧化钛纳米管(Pt/TNTs)。利用透射电镜(TEM)、X射线衍射(XRD)和紫外-可见光谱(UV-Vis)对产物进行了表征,并重点研究了Pt/TNTs的光催化性能。结果表明,有直径约为3 nm的Pt纳米粒子插入到了TNTs中,且Pt粒子以Pt单质的形式存在。Pt/TNTs在可见光区域表现出较强的吸收,并且其起始吸收带边发生明显红移。紫外光催化降解甲基橙实验结果表明,金红石相Ti O2,TNTs和Pt/TNTs对甲基橙溶液的降解率分别达到46.8%,57.2%和84.6%,Pt/TNTs的光催化活性较金红石相二氧化钛粉体和纯TNTs有显著的提高。Titania nanotubes （TNTs） were synthesized by hydrothermal treatment of rutile-phase TiO2 nanoparticals in NaOH solution at 110℃ for 24 hours. After drying in aceton for 36 h, the TNTs were under vacuum drying for 24 h at room temperature. The Pt-inserted titania nanotubes （Pt/TNTs） were obtained by filling H2 PtC16 ethanol solution into the TNTs after vacuum drying. The characterizations of the as-synthesized samples were confirmed by TEM, XRD, and UV-Vis. The photocatalytic activity of the Pt/TNTs was investigated by photo-induced decomposition of methyl orange（MO）under the main 365 nm UV- light. In order to comparison, the photocatalytic activity of both the rutilerphase TiO2 nanoparticles and pure TNTs were also investigated at the same time under the same experimental conditions. The TEM images show that the TNTs are hollow, a few hundred nanometers long, and the inner/outer diameter is about 6/10 nrn. The crystal structure of TNTs is H2Ti2O5 · H2O with a little Na. Both the shape and the crystalline of the TNTs are not changed after the modification. The oval or round Pt^0 nanoparticals, about 3 nm in diameter, are found only in the nanotubes. Pt/TNTs exhibit enhanced absorption at the visible range in the UV-Vis spectra and its start absorption band edge（λ0≈457 nm）is obviously redshifted compared to the rutile-phase TiO2 nanoparticals and pure TNTs. The Pt nanoparticles are found to significantly enhance the photocatalytic activity of TNTs. Pt/TNTs are demonstrated to be highly efficient for the UV-light induced photocatalytic decomposition of MO compared to both the futile-phase TiO2 nanoparticals and pure TNTs. After irradiation for 60 min, the photocatalysis decomposition rate of MO in futile-phase TiO2 nanoparticals, TNTs and Pt/TNTs are 46.8%, 57. 2% and 84.6% respectively.

关 键 词：纳米管 PT 二氧化钛 水热法 光催化 

分 类 号：O644[理学—物理化学]