Coupling of W-Doped SnO2 and TiO2 for Efficient Visible-Light Photocatalysis

Bulletin of the Korean chemical society

Wan In Lee¹  Young Sik Choi¹  Sher Bahadur Rawal¹  Devi Prashad Ojha¹ 

关键词: Tungsten-doped tin oxide;    Heterojunction;    WxSn1-xO2/TiO2;    Visible-light;    Photocatalyst;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

Five mol % tungsten-doped tin oxide (W0.05Sn0.95O2, TTO5) was prepared by co-precipitation of SnCl4·5H2O and WCl4, followed by calcination at 1000 oC. The as-prepared TTO5 was in the pure cassiterite phase with a particle size of ~50 nm and optical bandgap of 2.51 eV. Herein it was applied for the formation of TTO5/TiO2 heterojunctions by covering the TTO5 surface with TiO2 by sol-gel method. Under visible-light irradiation (λ ≥ 420 nm), TTO5/TiO2 showed a significantly high photocatalytic activity in removing gaseous 2-propanol (IP) and evolving CO2. It is deduced that its high visible-light activity is caused by inter-semiconductor holetransfer between the valence band (VB) of TTO5 and TiO2, since the TTO5 nanoparticle (NP) exhibits the absorption edge at ~450 nm and its VB level is located more positive side than that of TiO2. The evidence for the hole-transport mechanism between TTO5 and TiO2 was also investigated by monitoring the holescavenging reaction with 1,4-terephthalic acid (TA).

【 授权许可】

Unknown