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

Abstract

Abstract 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 radical with CV dye was calculated to be 3.96×109 M−1s−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.