Photocatalytic Degradation of Methyl Blue Dye by Pure and Platinum Doped Titanium Dioxide Nanotube Photocatalysts

摘要

Photocatalytic degradation of commercial methyl blue dye (MB) was investigated using Titanium Nanotubes (TNT) and Pt modified TNT (Pt-TNT) photocatalyst under 365 nm UV lamp irradiation. The effect of initial MB concentration, reaction temperature, catalyst loading, solution pH value and Pt loading were studied and the optimized values were obtained. Moreover, the photodegradation performance and kinetics of MB dye onto TNT and Pt-TNT were also examined with the aid of model analysis by kinetic data. The results showed that the performance of photocatalysts for treating MB was well under acid conditions. The time of complete decolorization and mineralization increased with an increase in the initial MB concentration. The decolorization and mineralization efficiency decreased with increasing initial MB concentration. The degradation efficiency could reach 100% under acid conditions at any initial MB concentration at reaction time is 70 min. In addition, experimental decolorization kinetics data followed the pseudo-first-order reaction model.