Photocatalytic bleaching of malachite green and brilliant green dyes using ZnS-CdS as semiconductor: A comparative study

ZnS-CdS catalysed photocatalytic bleaching of malachite green and brilliant green dyes has been investigated. The effect of various parameters, such as the pH, concentration of dyes, effect of amount of semiconductor and effect of light intensity etc. were observed and discussed. The progress of the photochemical oxidation was monitored spectrophotometrically. The optimum reaction conditions were experimentally determined. The photochemical oxidation of dyes follows pseudo – first kinetics. The final products of degradation were characterized and a tentative mechanism was proposed for the photochemical oxidation of dyes

Author(s): Jayant Gandhi, Rajesh Dangi, Jagdish Chandra Sharma, Nikhil Verma and Shipra Bhardwaj

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