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

The oxidative degradation of CV dye in aqueous media has been evaluated using Fenton (Fe 2+ /H 2 O 2 ) and photo-Fenton (Fe 2+ /H 2 O 2 /UV) processes. Various operational parameters like H 2 O 2 dosages, Fe 2+ 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 3.96×10 9 M −1 s −1 . De-methylated organic intermediates of CV dye detected by LC-MS and some other intermediates like CH 3 COO − , HCOO − , NH 4 + and Cl − were identified by ion-chromatography.