物理化学学报 >> 2008, Vol. 24 >> Issue (08): 1383-1386.doi: 10.3866/PKU.WHXB20080810

研究论文 上一篇    下一篇

载Ag二氧化钛纳米管的制备及其光催化性能

李海龙; 罗武林; 陈涛; 田文宇; 孙茂; 黎春; 朱地; 刘冉冉; 赵宇亮; 刘春立   

  1. 北京大学化学与分子工程学院, 北京分子科学国家实验室, 北京 100871; 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-高能物理所纳米生物效应联合实验室, 北京 100049
  • 收稿日期:2008-03-14 修回日期:2008-04-09 发布日期:2008-08-06
  • 通讯作者: 刘春立 E-mail:liucl@pku.edu.cn

Preparation and Photocatalytic Performance of Titania Nanotubes Loaded with Ag Nanoparticles

LI Hai-Long; LUO Wu-Lin; CHEN Tao; TIAN Wen-Yu; SUN Mao; LI Chun; ZHU Di; LIU Ran-Ran; ZHAO Yu-Liang; LIU Chun-Li   

  1. Beijing National Laboratory for Molecular Science, College of Chemistry &Molecular Engineering, Peking University, Beijing 100871, P. R. China; Laboratory for Bio-Environmental Health Sciences of NanoscaleMaterials and Nanosafety and Key Laboratory of Nuclear Analytical Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2008-03-14 Revised:2008-04-09 Published:2008-08-06
  • Contact: LIU Chun-Li E-mail:liucl@pku.edu.cn

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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4 nm, 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.

关键词: 纳米管, 二氧化钛, Ag, 水热法, 光催化

Abstract: Titania nanotubes (TNTs) were synthesized by hydrothermal treatment of rutile-phase TiO2 nanoparticles in 10 mol·L-1NaOHsolution 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 益. The characterizations of the as-synthesized samples were performed by TEM, EDS, XRD, XPS, and UV-Vis spectra. The photocatalytic 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 quantumdots, about 4 nmin 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 photocatalytic activity of TiO2 nanotubes, and the catalyst system was demonstrated to be highly efficient for the UV-light induced photocatalytic decomposition of MO compared to both rutile-phase TiO2 nanoparticles and pure TNTs. After irradiation for 60 min, the decomposition rates of MO solution in rutile-phase TiO2 nanoparticles, TNTs, and Ag/TNTs systemwere 46.8%, 57.2%, and 92.2%, respectively.

Key words: Nanotubes, Titania, Ag, Hydrothermal method, Photocatalysis

MSC2000: 

  • O644