摘要
以金红石相二氧化钛(TiO2)粉体为原料,采用水热法合成了二氧化钛纳米管(TNTs),在碱性条件下与AgNO3的乙二醇溶液反应,得到表面载Ag的二氧化钛纳米管(Ag/TNTs).利用透射电镜(TEM)、电子衍射能谱(EDS)、X射线衍射(XRD)、X射线光电子能谱(XPS)和紫外-可见光谱(UV-Vis)对产物进行了表征,重点研究了Ag/TNTs对甲基橙(MO)紫外光催化降解性能.结果表明,经Ag表面修饰后,纳米管的晶型结构没有发生明显变化,并且Ag粒子能很好地分散在纳米管的外表面.Ag粒子的直径约为4nm,以单质Ag的形态存在.Ag/TNTs在可见光区域表现出较强的吸收,光催化降解甲基橙实验结果表明,Ag/TNTs的光催化活性较金红石相二氧化钛粉体和纯TNTs有着显著的提高.
Titania nanotubes （TNTs） were synthesized by hydrothermal treatment of mille-phase TiO2 nanoparticles in 10 mol＇L^-1NaOH solution at 110℃ for 24 h. The Ag loaded titania nanotubes （Ag/TNTs） were obtained by chemical deposition method with the TNTs suspending in the AgNO3 solution （pH=8） at 50℃. The characterizations of the assynthesized samples were performed b.y TEM, EDS, XRD, XPS, and UV-Vis spectra. The photocatalyilc performance of the Ag/TNTs was investigated by UV-light induced photocatalytic decomposition of methyl orange（MO）. The results showed that the inner/outer diameters of TNTs were about 6/10 nm and the length was several hundred nanometers. Both the shape and the crystalline of the nanotubes were not changed after the modification. The zero oxidation state Ag quantum dots, about 4 nm in diameter, were well dispersed on the external surface of the nanotubes. Ag/TNTs exhibited enhanced absorption at the visible range in the UV-Vis spectra. The Ag nanoparticles were found to significantly enhance the photocatalyiic activity of TiO2 nanotubes, and the catalyst system was demonstrated to be highly efficient for the UV-light induced photocatalyiic decomposition of MO compared to both mille-phase TiO2 nanoparticles and pure TNTs. After irradiation for 60 min, the decomposition rates of MO solution in mille-phase TiO2 nanoparilcles, TNTs, and Ag/TNTs system were 46.8%, 57.2%, and 92.2%, respectively.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2008年第8期1383-1386,共4页
Acta Physico-Chimica Sinica
基金
国家自然科学基金“十五”重大项目(10490180)
国家自然科学基金(20471005、10775008)
国防科工委军工遗留专项基金(科工计[2007]840)
教育部博士点基金(20060001032)
国家大学生创新训练计划资助
关键词
纳米管
二氧化钛
AG
水热法
光催化
Nanotubes
Titania
Ag
Hydrothermal method
Photocatalysis
