Abstract:

TiO₂ with high activity (001) crystal surface was prepared by ultrasonic assisted sol-gel method with HF as crystal surface control agent. The results of XRD, TEM and N₂-BET showed that the prepared products were mainly anatase TiO₂. The addition of HF could effectively increase the proportion of (001) crystal surface, and the ultrasonic assistance could significantly reduce the particle size of TiO₂ and increase the specific surface area. When the HF addition amount was 1 mL, the ultrasonic power was 180 W, and the calcination temperature was 600℃, the prepared TiO₂ had the best photocatalytic performance for RhB. The ultrasonic assisted and the addition of HF could greatly improve the catalytic rate of the photocatalyst. The degradation efficiency was the best when TiO₂ dosage was 250 mg/L and RhB concentration was 0.5×10^-5 mol/L.

Key words: ultrasound-assisted, high-energy crystal surface, TiO₂, photocatalytic activity

摘要：

以HF为晶面控制剂，通过超声辅助-溶胶凝胶法制备暴露高活性（001）晶面的TiO₂。XRD、TEM、N₂-BET表征结果表明，制备得到的产物主要为锐钛矿TiO₂，HF的添加可以有效提高（001）晶面占比，超声辅助可以明显减小TiO₂粒径，增大比表面积。当HF添加量为1.0 mL，超声功率为180 W，煅烧温度为600℃时，制备的TiO₂对RhB的光催化降解性能最佳。超声辅助和HF的添加可使光催化剂的催化速率显著提高。当TiO₂投加量为250 mg/L，RhB初始浓度为0.5×10^-5 mol/L时，降解效果最佳。

关键词: 超声辅助, 高能晶面, TiO₂, 光催化活性

CLC Number: 

• X703