Photocatalytic Degradation of Crystal Violet (C.I. Basic Violet 3) on Nano TiO2 Containing Anatase and Rutile Phases (3:1)

Abstract

The photocatalytic oxidation of crystal violet, a triphenyl methane dye in aqueous solutions was investigated with nanoanatase TiO2 containing Anatase and rutile phases in the ratio of 3:1, under UV light by using a 125 W high pressure mercury vapor lamp as the source. The dye degradation using Ag+ doped TiO2 and nanoanatase TiO2 was compared. An optimum catalyst dose of 1 g/L was used. It was found that nanoanatase TiO2 had a higher efficiency than the Ag+ doped Titanium di Oxide. Nanoanatase TiO2 was found to be easy to separate from the treated effluent by simple centrifuging. The degradation of the dye of initial concentration: 5�10-5 mol/L, using nanoanatase TiO2 was greater than 99.5% on UV illumination for 45 minutes and that with Ag+ doped Titanium di Oxide as catalyst, was found to be 75% for 45 minutes of illumination. The effects of various parameters such as pH; initial dye concentration and catalyst dose on the reaction rate were studied. The kinetics of degradation fit well to Langmuir-Hinshelwood rate law..