Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5146400 | International Journal of Hydrogen Energy | 2017 | 13 Pages |
Abstract
By using TiO2 and Ta2O5 colloids, a stable and efficient visible-light driven photocatalyst, Er3+:Y3Al5O12/TiO2Ta2O5/MoO2 composite membrane, was successfully prepared via sol-gel dip coating method at room temperature. The XRD, FTIR, SEM, TEM and EDX results confirm that approximately spherical Er3+:Y3Al5O12 nanoparticles were embedded in TiO2Ta2O5 matrix. UV-vis absorption and PL spectra of Er3+:Y3Al5O12 were also determined to confirm the visible absorption and ultraviolet emission. The photocatalytic hydrogen generation was carried out by using methanol as sacrificial reagent in aqueous solution under visible-light irradiation. Furthermore, some main influence factors such as heat-treated temperature, heat-treated time and molar ratio of TiO2 and Ta2O5 on visible-light photocatalytic hydrogen generation activity of Er3+:Y3Al5O12/TiO2Ta2O5/MoO2 composite membrane were studied in detail. The experimental results showed that the photocatalytic hydrogen generation activity of Er3+:Y3Al5O12/TiO2Ta2O5/MoO2 composite membrane heat-treated at 550 °C for 3.0 h was highest when the molar ratio of TiO2 and Ta2O5 was adopted as 1.00:0.50. And that a high level photocatalytic activity can be still maintained after four cycles. In addition, a possible mechanism for the visible-light photocatalytic hydrogen generation of the Er3+:Y3Al5O12/TiO2Ta2O5/MoO2 membrane was proposed based on PL spectra.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Ying Zhou, Shengnan Wei, Siyi Li, Xudong Liu, Xiaoqing Shu, Xu Zhang, Cheng Zhao, Zepeng Qu, Dawei Fang, Zhaohong Zhang, Jun Wang,