Light Induced Kinetic Studies of Oxidative Degradation of Malachite Green

Abstract

Oxidative degradation of malachite green was performed in presence of Fe(III) + H₂O₂ mixture in dark and in light. The UV radiation completely mineralized the dye molecules where the degradation rate was decreased in the order of UV > visible > dark. Malachite green molecules showed optimum colour in the pH range of 3.8-5.9. The effective Fenton activity was noticed at [H₂O₂]/[Fe(III)] ratio of 7.01. The degradation rate was positively influenced by the temperature where the activation energy degradation was estimated as 16.83 kJ mol^-1. A maximum 86 % degradation was achieved at 45 ºC.