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Photocatalytic decolorization and mineralization of Reactive Red 120 (RR120) has been studied in the presence of Degussa P25 TiO 2 . Photocatalytic decolorization studies were performed in a shallow pond slurry reactor under UV radiation (&gt;300 nm). Studies related to adsorption equilibrium of dye, the influence of pH, catalyst load, dye concentration and, area to volume ratio (A/V) of reactor on decolorization kinetics were performed. Mineralization studies were performed at optimized conditions of pH. The maximum adsorption (49 mg/g) of dye occured at pH 3. Adsorption studies revealed that impurities present in dye also get adsorbed over catalyst surface. This was indicated by the larger decrease in total organic carbon than that suggested by the reduction in color of the dye, during dye adsorption on the photocatalyst. Percentage decolorization in 30 minutes decreased from 75% at the A/V ratio of 0.20108 cm 2 /ml to 48% at the A/V ratio of 0.10054 cm 2 /ml. Mineralization studies based upon Total Organic Carbon (TOC) indicate the formation of strongly complex compounds. Slow reduction in TOC implies that toxicity of effluent may persist even after complete decolorization.

TiO 2 -assisted Photocatalytic Degradation of Diazo Dye Reactive Red 120: Decolorization Kinetics andMineralization Investigations