title: Decolorization and degradation of H-acid and other dyes using ferrous-hydrogen peroxide system.
abstract: In this study, advanced oxidation process utilizing Fenton's reaction was investigated for the decolorization and degradation of two commercial dyes viz., Red M5B, Blue MR and H-acid, a dye intermediate used in chemical industries for the synthesis of direct, reactive and azo dyes. Effect of Fe2 +, H2O2, pH, and contact time on the degradation of the dyes was studied. Maximum color and COD removal was obtained for Red MSB, H-acid and Blue MR at 10-25 mg/l of Fe2+ dose and 400-500 mg/l of H2O2 dose at pH 3.0. The initial oxidation reaction was found to fit into first order rate kinetics and the rate of oxidation of H-acid was higher than the other dyes. Release of chloride and sulfate from the Fenton's treated Red M5B dye and sulfate from H-acid and Blue MR indicates that the dye degradation proceeds through cleavage of the substituent group.
authors.affiliation: National Environmental Engineering Research Institute (NEERI), CSIR Complex, Chennai 600113, India. kanchana74in@yahoo.co.in
authors.forename: K
authors.initials: K
authors.lastname: Swaminathan
authors.forename: S
authors.initials: S
authors.lastname: Sandhya
authors.forename: A
authors.initials: A
authors.lastname: Carmalin Sophia
authors.forename: K
authors.initials: K
authors.lastname: Pachhade
authors.forename: Y V
authors.initials: YV
authors.lastname: Subrahmanyam
mesh_terms: D004396:Coloring Agents / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry*; D009282:Naphthalenesulfonates / Q000737:chemistry*; D010084:Oxidation-Reduction; D013056:Spectrophotometry, Ultraviolet; D013783:Textile Industry; D013997:Time Factors
chemical_list: D004396:Coloring Agents; C045076:Fenton's reagent; D005296:Ferrous Compounds; D007220:Industrial Waste; D009282:Naphthalenesulfonates; C020748:ferrous sulfate; C450879:1-naphthol-8-amino-3,6-disulfonic acid; D006861:Hydrogen Peroxide; D007501:Iron