Abstract: One-dimensional TiO₂ nanotubes were prepared by hydrothermal method, and also applied to the photocatalytic degradation of gaseous benzene. The effects of the dosage of TiO₂, the area of TiO₂ and the initial concentration of benzene on the photocatalytic performance were discussed, and the degradation kinetics were investigated. The results show that when the catalyst dosage is 0.5 g, the area is 180 cm², and the initial concentration of benzene is 480 mg/m³, the removal rate of benzene is up to 66%. Moreover, with the increase of catalyst dosage and area, the degradation rate of gaseous benzene increases, but the effect is gradually weakened. However, the initial concentration of gaseous benzene has a great influence on the photocatalytic degradation rate, and the process is in accord with the pseudo-first order kinetics law, which can be described by the L-H dynamic model, the kinetic equation of photocatalysis is established as r=0.003 8C_t/(1+0.587C_t).

Key words: one-dimensional structure, TiO₂ nanotube, hydrothermal method, photocatalysis, gaseous benzene, kinetic