Photooxidative degradation of Malachite Green(MG)by UV/H_2O_2:Influence of operational parameters and kinetic modeling

摘要

The decolorization of Malachite Oxalate Green(MG),a dye containing three groups of aryls was investigated using UV radiation in the presence of H_2O_2 in a batch photoreactor at different hght intensities.H_2O_2 and UV-light showed negligible effect when they were used independently.Removal efficiency of MG was sensitive to the operational parameters such as initial concentrations of H_2O_2,MG and hght intensity.The semi-logarithmic graphs of the concentrations of MG versus time were linear,suggesting pseudo-first order reaction(kappa_(optimum)=1.006 min~(-1)).A simple kinetic model is proposed which confirms pseudo-first order reaction.