Degradation of Crystal Violet Dye by Fenton and Photo-Fenton Oxidation Processes

摘要

The oxidative degradation of CV dye in aqueous media has been evaluated using Fenton (Fe2+/H2O2) and photo-Fenton (Fe2+/H2O2/UV) processes. Various operational parameters like H2O2 dosages, Fe2+ dosages and [CV](0) were optimized of both Fenton and photo-Fenton processes for the removal of CV dye from aqueous media. Kinetic results indicated that photo-Fenton process (k(obs) = 0.0097 min(-1), t(1/2) = 71.45 min) is more effective than Fenton process (k(obs) = 0.0074 min(-1), t(1/2) = 93.66 min). Second order rate constant of (OH)-O-center dot radical with CV dye was calculated to be 3.96 x 10(9) M(-1)s(-1). De-methylated organic intermediates of CV dye detected by LC-MS and some other intermediates like CH3COO-, HCOO-, NH4+ and Cl- were identified by ion-chromatography.