Ag/TiO2纳米管的制备及其光催化性能

Preparation of Ag/TiO2 Nanotube and Its Photocatalytic Performance

摘要:

对纯钛片进行阳极氧化，得到长度约2 μm的TiO2纳米管，在AgNO3溶液中TiO2纳米管在紫外光照射下，成功的将Ag+离子还原为Ag单质，并沉积在TiO2纳米管表面；用XRD, SEM 和XPS对制备的样品进行表征，结果显示：Ag微粒(10~120 nm)是以单质的形式，不均匀的分布在TiO2纳米管表面，并具有很好的化学稳定性；Ag/TiO2纳米管光电催化效率随Ag量的增加而增加，但超过最佳值后降解效率就会下降；实验显示Ag含量为1.15% 的Ag/TiO2纳米管降解效率最高，紫外光照射3 h后，初始浓度为10×10-6mol/L的亚甲基蓝溶液降解率达到100%，比未掺杂Ag的TiO2纳米管降解效率提高了22.98%

Abstract:

Ag nanoparticles were deposited photocatalytically on the TiO2 nanotube surface prepared by anodizing in an electrolyte of AgNO3 and characterized by XRD, SEM and X-ray Photoelectron Spectroscopy (XPS). The results show that the Ag particles (from 10 ~120 nm in size) are deposited on the TiO2 nanotube surface un-uniformly as Ag0 and Ag particles, showing a good chemical stability. The photo-degradation rate of mathylene blue solution increases as the content of Ag loaded on nanotube surface increase. If the content is greater then the most optimally content, the photo-degradation rate will decrease. It is shown that the photo-degradation rate is the highest when the content of Ag is about 1.15%. The Ag loaded nanotubes have much higher photo-degradation rate of about 22.98% than un-loaded nanotubes. The degradation rate is about 100% after UV irradiation of mathylene blue solution of 10×10-6mol/L for 3 h