Influence Factors and Kinetics on Crystal Violet Degradation by Fenton and Optimization Parameters using Response Surface Methodology

摘要

This work investigated influence factors and kinetics on crystal degradation violet dye by Fenton. For FeSO4 dose, fitted the date of crystal violet concentration and time, it conformed to first-order kinetic. At 0.1ml H2O2, decolorization rate was 98.2% and it increased to 98.7% when H2O2 was raised to 0.2ml at 15 min. However, H2O2 doses higher than 0.4ml, no obvious increased in the removal was observed. An important pH effect was found, reaching its degradation at pH 2.0 with decolorization rate of 97% at 30min. However, when pH was 4 and 6, the removal was only 79% and 72% at 40min. The Box-Behnken Response Surface Methodology was utilized for mathematical modeling for decolorization rate as a response by Fenton. The determinate coefficient of model was 0.9851. The optimum operating conditions were that FeSO4 dose was 4.55ml, H2O2 dose was 0.20ml and reaction time was 15min. Under such conditions, the error of the model predicted and experimental values was 1.85%.