银负载二氧化钛纳米管阵列的制备及光催化性能

PDF全文下载：20160100032

辰云，闫凤英，陈克正*

(青岛科技大学 材料科学与工程学院，山东 青岛 266042)

摘要：采用电化学阳极氧化法在金属钛表面制得了二氧化钛纳米管阵列（TNTA），通过甲醛还原Ag+的方法，使二氧化钛纳米管表面负载了Ag纳米粒子（Ag/TNTA）。利用扫描电镜(SEM)、X射线衍射仪(XRD)对样品微观结构进行了表征，并利用双光束紫外可见分光光度计检测了样品对臧红T降解的催化性能。结果表明：得到的TNTA管壁平整，管径为85~120 nm，管状结构的排列高度有序，Ag在TNTA上的负载量随着在银氨溶液和甲醛溶液中的浸泡次数而增加，其中交替浸泡3次的Ag/TNTA对臧红T的降解效果最佳，交替浸泡5次和7次时，由于负载过多的Ag纳米粒子不利于光生电子空穴对的分离，催化作用反而下降。与TNTA对臧红T的降解作用相比，Ag/TNTA复合结构的降解作用明显增强，说明Ag/TNTA复合结构的光催化性能较好。

关键词： TiO2纳米管阵列；Ag/TNTA复合结构；光催化性能

 中图分类号： O 614                          文献标志码：A

Preparation of Silver Loaded Titania Nanotube Arrays and Their Photocatalytic Performance

 LI Chenyun, YAN Fengying, CHEN Kezheng

 (College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)

 Abstract: In this paper, the titania nanotube arrays were prepared via an electrochemical anodic oxidation method. Using formaldehyde as a reducing agent, silver ions were turned into Ag nanoparticles, and then loaded on the surface of titanium dioxide nanotubes. Scanning electron microscope (SEM) and Xray diffraction (XRD) were used to characterize the microstructure of the asprepared samples. The photodegradation effect of safranine T by the samples was tested by a double beam UV visible spectrophotometer. The results show that the pipe walls of the regular nanotubes are very smooth and the diameters of which are about 85—120 nm. The capacity of Ag on TNTA increased with the soaking times in silverammonia solution and formaldehyde solution. The obtained Ag/TNTA alternatively immersed 3 times has the best degradation efficiency of safranine T. The degradation efficiency decreased for the Ag/TNTA soaked 5 or 7 times due to inhibitation of the separation of photo generated electrons and holes which result from too much Ag nanoparticles loaded. For the degradation of safranine T，Ag/TNTA is more obvious than TNTA，suggesting that Ag/TNTA composite has better photocatalytic performance.

Key words: titania nanotube arrays; Ag/TNTA composite; photocatalytic performance

收稿日期： 20141021

基金项目： 国家自然科学基金项目（51072087）.

 作者简介： 李辰云(1988—)，女，硕士研究生.   *通信联系人.

文章编号： 16726987（2016）01003205； DOI： 10.16351/j.16726987.2016.01.007