INFLUENCE OF ANNEALING TEMPERATURE OF TiO2 NANOTUBES VIA HYDROTHERMAL METHOD ON Ti FOIL FOR PHOTOCATALYTIC DEGRADATION

[摘要] Using Ti foil as titanium source, TiO2 nanotubes were prepared via a one-step hydrothermal method with heat temperature of 140°C for 6 h in 10 M NaOH solution. The samples calcined at different temperatures were characterized by XRD, SEM, EDX and TEM. As TiO2 nanotubes calcined at 650°C, anatase phase started to transform to rutile phase. Meanwhile the structure of TiO2 nanotubes began to be destroyed and the length was shortened. At a calcination temperature of 750°C, the tubular structure is completely disappeared, instead of rod-shaped nanoparticles. Due to the anatase phase composition and the preservation of nanotubes structure, TiO2 calcined at 450°C exhibited the best photocatalytic activity evaluated by degradation of MB solution.

[学科分类] 生物技术

[关键词] TiO2 nanotubes;Hydrothermal;Calcination temperature;Photocatalytic;degradation