Catalytic Role of Micelles on Decolorization of Mixed Azo Dyes Effluents (MDE) Through Fenton Advanced Oxidation Process (AOP)

Abstract Surfactants are substances that have the ability to self-assemble and, based on their structural characteristics and electric charge, can engage with other materials (substrates) as either monomers or micelles. These interactions, which may either accelerate or impede reaction rates, are examined through the use of pseudo-phase, cooperativity, and stoichiometric (classical) models. The results of the study designate that elevated concentrations of surfactants exceeding the CMC may obstruct the decolorization process due to micelle coagulation, which traps the dye molecules within tiny space by close contacts increase the collusions thus enhance the decolorization rate of MDE. Moreover, survey of the catalytic effects of surfactant micelles in aqueous-Fenton-Micellar environments, with three distinct types of surfactants (Cationic-Cetyltrimethylammonium Bromide (CTAB), Anionic-Sodium Dodecyl Sulfate (SDS), and Nonionic-Alkylphenyl Polyethylene Glycol(TX-100)), have shown catalytic role on the decolorization rate of MDE, provoked by the concentrations of both Fenton reagents and surfactants. The surfactants have been ruled to influence the catalytic efficiency regarding the decolorization rates of dyeing effluents, with the order being: Aqueous (71.23%) < [CTAB] (75.36%) < [SDS] (80.07%) < [TX-100] (82.11%) at the same reaction conditions.