Malachite green dye degradation using ZnCl2 activated Ricinus communis stem by sunlight irradiation

Abstract

The degradation capacity of Malachite Green is tested with ZRCS using Sunlight irradiation by batch mode experiments such as the effect of pH, the effect of contact time, the effect of adsorbent dosage and initial dye concentration. The result indicates that the maximum degradation of Malachite Green is obtained as 85.30% at pH 6 in 90 minutes. The optimum conditions for the degradation of Malachite Green dye are 40ppm initial dye concentration and optimum dose of the carbon is 0.2g. The isotherms and isotherm constants are described by using Langmuir and Freundlich isotherm models for the degradation of Malachite Green using ZRCS. The Langmuir and Freundlich Models are very well fitted with the equilibrium data. The value of qe is 16.6mg/g for Malachite Green on ZRCS. From the value of qe, it is fitted well with a pseudo first order kinetics. ZRCS could be used as an effective adsorbent in cationic dye degradation.