焙烧温度对TiO2纳米管结构及吸附性能的影响

EFFECTS OF CALCINATION TEMPERATURES ON THE STRUCTURE AND ADSORPTION BEHAVIOR OF TITANIA NANOTUBE

采用水热法在不同焙烧温度下制备了具有不同特性的TiO2纳米管(TNT).用X射线衍射(XRD)、高分辨透射电镜(HRTEM)和BET比表面积对其结构和形貌进行表征.以亚甲基蓝(MB)为模型反应物,考察了不同焙烧温度下的TiO2纳米管在不同环境温度下对MB的吸附行为.结果表明:随着焙烧温度的升高,TiO2纳米管中锐钛矿的含量增加、比表面积减小;MB在TiO2纳米管上的吸附量随着纳米管焙烧温度的升高显著降低;环境温度对MB在TiO纳米管上的吸附随着TiO纳米管焙烧温度的不同而有差异.

In this study, titania nanotube （abbreviated as TNT） was prepared via a hydrothermal method and TNTs with different properties were obtained after calcined at different temperatures. XRD, HRTEM and BET specific surface area were used to characterize the structure and morphology of TNTs. Methylene blue （ abbreviated as MB） aqueous solution was selected as a probe to evaluate the adsorption activity of TNTs and the adsorption behaviors of MB on TNTs under different environmental temperatures were investigated. The results showed that with the increase of calcination temperature the anatase content in TNT increased and BET specific surface area decreased. The maximum adsorption amount of MB on TNTs was closely related to the calcination temperature, TNT calcinated at high temperature exhibited a poor adsorption capacity. The influence of adsorptive temperatures on the adsorption behavior varied with the properties of TNTs.