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A Kinetic Study of the Reaction of Colloidal Manganese Dioxide with Perchloric Acid in Neutral Aqueous Solution

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A dark brown colloidal MnO2 has been prepared by the reduction of KMnO4 by formic acid in neutral aqueous solution at 25 °C. The colloid was characterized using spectrophotometric and coagulation methods. Colloidal MnO2 was found to react spectrophotometrically with HClO4 in neutral aqueous solution at 25 °C. Attempts were made for kinetic analysis of the concentration-time profiles of MnO2 species. The decay profiles of MnO2 appear essentially exponential in nature. Addition of KI salt in the product mixture indicates that the end product contained Mn-species in the oxidation states higher than +2. The average oxidation state of the Mn-species during the reaction determined iodimetrically suggests the formation of intermediate Mn-species with oxidation state higher than +2. The rate of decay of the average oxidation state was slower than the rate of decay of MnO2. This is attributed to secondary reactions leading to formation of the final product species Mn2+. The reaction followed neither first order nor second order kinetics. A mechanism for the reaction is proposed.
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Keywords: AVERAGE OXIDATION STATE; COLLOIDAL MNO2; KINETIC; MOLAR EXTINCTION COEFFICIENT; PERCHLORIC ACID

Document Type: Research Article

Publication date: 01 March 2013

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  • Journal of Colloid Science and Biotechnology is an international multidisciplinary peer- reviewed journal covering all aspects of colloid science including colloids preparation, characterization, structure-property relationships, spectroscopy, chemical and physical properties and applications of colloids in biotechnology, medicine and pharmaceuticals. This journal deals with interdisciplinary research areas of chemistry, physics, biology, materials science, polymer science, nanotechnology covering all topics related to colloids such as latexes, emulsions, suspensions, micellar systems, gels, composites, hybrids, surfactants, aerosols, foams, minerals, soft matter, microfluidics, encapsulation processes of active molecules, biomolecules, surfacial and interfacial processes, catalysis, electrochemistry, theoretical aspects, computer simulations and colloids in biotechnology and medicine.
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