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Abstract

PHOTOCATALYTIC TREATMENT OF TEXTILE INDUSTRY EFFLUENT HAVING DYES USING SOME COMPOSITE SEMICONDUCTORS

Sukumal Jain and Shiv Singh Dulawat*

Abstract

In this research, the photocatalytic degradation of textile wastewater from Bhilwara textile industry in Rajasthan, India, using composite TiO2 and ZnO with different ratio as photocatalysts was investigated. The experiments were carried out at 36oC in a stirrer bath reactor by using Ultra-Violet photo oxidation process. The effect of pH, time, amount of catalyst and ratio of composite TiO2 and ZnO was investigated and the optimized conditions for maximum amount of degradation were determined. The progress of reaction was observed spectrophotometrically. Titanium dioxide and zinc oxide proved to be very effective catalysts in photocatalytic degradation of real textile industrial water. The maximum decolorization achieved was 88 by using composite TiO2 and ZnO 1gm/l with (90:10) ratio at 36oC and pH of 8.5, within 180 minutes of irradiations. The results indicate that for real textile wastewater, composite TiO2 and ZnO (90:10) ratio is comparatively more effective than only TiO2 or only ZnO. This study proves that real textile wastewater reacts differently to catalysts than aqueous solution of azo-dyes, which is associated with surface steps and sensitization of the reaction rate by presence of other contaminants in real textile wastewater.

Keywords: Photocatalytic degradation, Wastewater treatment, Ultra Violet light, Textile industry, Titanium dioxide, Zinc oxide.


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