Effect of Oxygen Vacancies on Photocatalytic Efficiency of TiO2 Nanotubes Aggregation

Bulletin of the Korean chemical society

Lei Qiao¹  Lu Lu¹  Peng Xiao¹  Feila Liu¹  Huichao He¹  Yunhuai Zhang¹ 

关键词: Aggregation of TiO2 nanotubes;    Annealing treatment;    Oxygen vacancies;    Photocatalysis;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

Aggregation of titania nanotubes (TNTs) fabricated by hydrothermal method were calcined in air and dry nitrogen; Changes in morphology and crystallinity of the nanotubes were studied by means of TEM, EDX, and XPS. EDX patterns and XPS spectra proved that there were a certain densities of oxygen vacancies in TNTs annealed in N2. The photocatalysis experiments revealed TNTs/N2 possesses significantly higher photocatalytic efficiency than TNTs annealed in dry air to degrade methylene blue. The correlation between oxygen vacancies and photocatalytic property may be attributed to: 1) oxygen vacancies might have affected results on water molecules adsorption and increase of the hydroxyl concentration; and 2) oxygen vacancies resulted in some changes in electronic structure of TNTs/N2 aggregation and Fermi level extends into the conducting band.

【 授权许可】

Unknown