Chemical oxidation of methylene blue using a Fenton-like reaction.
Oxidation by Fenton-like reactions is proven and economically feasible process for destruction of a variety of hazardous pollutants in wastewater. We report herein the oxidation of methylene blue, a basic dye of thiazine series using a Fenton-like reaction at normal laboratory temperature and at atmospheric pressure. The effects of different parameters like the initial concentrations of dye, Fe2+, and H2O2, pH of the solution, reaction temperature, and added electrolytes on the oxidation of the dye present in dilute aqueous solution in the concentration range (3.13-9.39)x10(-5)mol dm(-3) (10-30 mg l(-1)) have been assessed. The results indicate that the dye can be most effectively oxidized in aqueous solution at dye:Fe(2+):H2O2 molar ratio of 1:1.15:14.1. More than 98% removal of the dye could be achieved in 1h in the pH range 2.2-2.6 at 299 K which corresponds to about 81% reduction of the initial COD. The results will be useful for designing the treatment systems of various dye-containing wastewaters.
Dutta
K
K
Department of Chemistry, Jadavpur University, 700 032, Calcutta, India.
Mukhopadhyay
S
S
Bhattacharjee
S
S
Chaudhuri
B
B
D004791:Enzyme Inhibitors / Q000737:chemistry*; D006861:Hydrogen Peroxide; D007501:Iron; D008751:Methylene Blue / Q000737:chemistry*; D010084:Oxidation-Reduction; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical
D004791:Enzyme Inhibitors; C045076:Fenton's reagent; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide; D007501:Iron; D008751:Methylene Blue