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Abstract

Introduction:In the geochemistry of the ocean, MnO 2 is a significant phase. It has a significant role in the formation of hydrous iron oxide and manganese nodules. Materials and Methods: The UV-Vis spectrum at 390 nm was used to characterize water soluble colloidal MnO 2 . Non-ionic surfactant such as Tween 80 used for this investigation. Results and Discussion: The kinetics of the oxidation of citric acid by water soluble colloidal MnO 2 in the presence of Tween-80 surfactant have been reported for the 1 st time. There is no effect of ionic surfactants CTAB and SDS. The reaction proceeds through the adsorption of lactic acid on the surface of the colloidal particles. Conclusion: The non-ionic surfactant Tween-80 showed a catalytic effect up to certain concentrations thereafter an inhibitory effect follows. Non-ionic surfactant Tween-80 by bringing the reactants close and closer due to multiple hydrogen bonding. In doing so rate increased.