Sonodegradation and photodegradation of methyl orange by InVO<sub>4sub>/TiO<sub>2sub> nanojunction composites under ultrasonic and visible light irradiation
- 作者：YuLin Min<sup>asup><sup> ; sup><sup>bsup><sup> ; sup><sup>ahaqmylin@yahoo.comsup> ; Kan Zhang<sup>csup><sup> ; sup><sup>Zhangkan112255@hotmail.comsup> ; YouCun Chen<sup>asup><sup> ; sup><sup>bsup> ; YuanGuang Zhang<sup>asup><sup> ; sup><sup>bsup>
- 关键词：InVO4/TiO2 nanojunction composites ; Sonocatalytic activity ; Photocatalytic activity ; Charge transfer
- 刊名：Ultrasonics Sonochemistry
- 出版年：2012
- 期刊代码：81_13504177
- 类别：ph
- 出版时间：July, 2012
- 卷：19
- 期：4
- 页码：883-889
- 文件大小：1193 K
摘要
The InVO<sub>4sub>/TiO<sub>2sub> nanojunction composites with different weight ratio of 1:10, 1:25, 1:50 and 1:100 were successfully constructed using an ion impregnate method, followed by calcining temperature 400 掳C for 2 h in Ar. The sono- and photo-catalytic activities of the InVO<sub>4sub>/TiO<sub>2sub> nanojunction composites were evaluated through the degradation of methyl orange (MO) in aqueous solution under ultrasonic and visible light irradiation, respectively. The experimental results determined that the (1:50) InVO<sub>4sub>/TiO<sub>2sub> nanojunction composite has exhibited the highest sonocatalytic activity. It can be ascribed to vectorial charge transfer at the co-excited InVO<sub>4sub>/TiO<sub>2sub> interface under ultrasonic irradiation, results in the complete separation of electrons and holes. Interestingly, the (1:25) InVO<sub>4sub>/TiO<sub>2sub> nanojunction composite displayed superior photocatalytic activity for MO degradation under visible light, indicating that InVO<sub>4sub> as a narrow band gap sensitizer can expand photocatalytic activity of TiO<sub>2sub> to visible region, and the charge transfer can be formed from high energy level of InVO<sub>4sub> conduction band to the low energy level of TiO<sub>2sub> conduction band in a present of excited InVO<sub>4sub> alone under visible light irradiation. The sono- and photo-catalytic activities of the InVO<sub>4sub>/TiO<sub>2sub> nanojunction composites were found to be dependent significantly on different InVO<sub>4sub> contents, which can be explained by the influence of charge transfer on the basis of the work functions of different catalysis mechanism.