物理化学学报 >> 2011, Vol. 27 >> Issue (12): 29332933-2938..doi: 10.3866/PKU.WHXB20112933

材料物理化学 上一篇    下一篇

Ag负载TiO2纳米管微波辅助水热法制备及其光催化性能

陈淑海1,2, 徐耀1, 吕宝亮1, 吴东1   

  1. 1. 中国科学院山西煤炭化学研究所, 煤转化国家重点实验室太原 030001;
    2. 中国科学院研究生院, 北京 100049
  • 收稿日期:2011-07-20 修回日期:2011-09-29 发布日期:2011-11-25
  • 通讯作者: 徐耀 E-mail:xuyao@sxicc.ac.cn
  • 基金资助:

    国家自然科学基金(10835008)资助项目

Microwave-Assisted Hydrothermal Synthesis of Ag-Loaded Titania Nanotubes and Their Photocatalytic Performance

CHEN Shu-Hai1,2, XU Yao1, LÜ Bao-Liang1, WU Dong1   

  1. 1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2011-07-20 Revised:2011-09-29 Published:2011-11-25
  • Contact: XU Yao E-mail:xuyao@sxicc.ac.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (10835008).

摘要: 以微波辅助水热法制备了二氧化钛纳米管, 然后通过浸渍法在其表面负载了银纳米颗粒. 所得样品用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、氮吸附、X射线光电子能谱(XPS)、紫外-可见漫反射等测试方法表征. 微波加热处理可以大大缩短反应时间, 产物为无定型纳米管, 经高温焙烧后转变成锐钛矿型二氧化钛. 所得纳米管的外径为7-8 nm, 内径为5-6 nm, 管长约200 nm, 比表面积可达371 m2·g-1. 负载的银分散在纳米管的表面, 对纳米管的结构与晶型没有影响, 但是拓宽了二氧化钛的光吸收范围, 使吸收边红移至可见光区, 并且有效抑制了光生电子空穴的复合. 在可见光降解罗丹明B的实验过程中, 与Ag负载的P25及纯二氧化钛纳米管相比, Ag负载二氧化钛纳米管具有更高的可见光催化活性, 并且当Ag/Ti 物质的量的比为0.5%时, 可见光催化性能最好.

关键词: 二氧化钛纳米管, 微波合成, 银负载, 可见光催化

Abstract: Ag-loaded titania nanotubes were synthesized by a microwave-assisted hydrothermal method and were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption, X-ray photoelectron spectroscopy (XPS), and UV-visible (UV-Vis) diffuse reflectance spectroscopy. The titania nanotubes were found to be in the anatase phase after calcination. The length of the synthesized titania nanotubes was about 200 nm, the average outer diameter was 7-8 nm, the inner diameter was 5-6 nm and the specific surface area was found to be 371 m2·g-1. With Ag loading the silver atoms did not enter the lattices of the nanotubes but dispersed over the nanotube surface. Ag-loading had no effect on the nanostructure and the crystal phase of the TiO2 nanotubes. The Ag-loaded titania nanotubes showed obvious visible light absorption and enhanced visible photocatalytic performance. The photocatalytic activity was evaluated by the photodegradation of a Rhodamine B aqueous solution under visible light. Compared with Ag-loaded P25 and pure titania nanotubes the Ag-loaded titania nanotubes enhanced the photoactivity and reached the maximum activity at a Ag/Ti molar ratio of 0.5%.

Key words: Titania nanotube, Microwave synthesis, Silver loading, Visible photocatalysis

MSC2000: 

  • O643