Application of charged micelle generators on the oxidation of metabisulphite ion by molybdenum-oxime complex: Piszkiewicz kinetic model

The chemical characteristics of sulfur oxyanions as antioxidants is an interesting course worth probing, and understanding their mechanistic pathway is key. Hence, the application of charged micelle generators on the oxidation of the metabisulphite ion by the molybdenum-oxime complex (MOC) is suggested. Piszkiewicz's model is checked, and its dynamics are explored to offer explanations on the implication of the surfactants' involvement in the redox behavior of metabisulphite with the MOC. The reaction reveals a strong dependence of reaction rate on the positively charged micelles of cetyltrimethylammonium bromide (CTAB) compared to the negatively charged micelles of sodium dodecyl sulfate (SDS) due to the high cooperativity order exhibited by the CTAB with the substrates, which are supported by a remarkable binding constant that exists between them within the Palisade-Stern layer region of the micelle. The inhibitory results exerted by SDS on the reaction rate infers a probable repulsion between it and the reactant at the head polar layer of the micelle. The influence of cationic (NH₄⁺) and anionic (HCOO⁻) counter-ions on the oxidation rate supplements the role of the surfactant's interaction with the redox partners at the slow phase. The contribution of ion concentration to the oxidation rate depicts a reaction proceeding through a positive Brønsted salt effect, and the variation in the oxidation-environment polarity strengthened the outcome of the varied ion concentration on the oxidation rate, which is clarified better by Piszkiewicz’s model. Sulfur oxyanion radical was imperative in the reduction route of the coordinated MOC by the metabisulphite ion.