Abstract
Kinetics of the redox reaction between colloidal MnO2 and glycolic acid have been studied spectrophotometrically by monitoring the decay in the absorbance of colloidal MnO2 in absence and presence of surfactants. Anionic sodium dodecyl sulfate has no effect, non-ionic Triton X-100 catalyzed the reaction and experiments were not possible in presence of cationic cetyltrimethylammonium bromide due to the precipitation of MnO2.The reaction followed the same type of kinetic behavior, i.e., fractional-, first- and fractional-order dependencies, respectively, in [glycolic acid], [MnO2] and [H+ ] in both the media. Effects of gum arabic and manganese(II) have also been studied and discussed. Mechanisms in accordance with the experimental data are proposed for the reaction.
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Kabir-ud-Din, Iqubal, S.M.S. & Khan, Z. Effect of ionic and non-ionic surfactants on the reduction of water soluble colloidal MnO2 by glycolic acid. Colloid Polym Sci 284, 276–283 (2005). https://doi.org/10.1007/s00396-005-1373-7
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DOI: https://doi.org/10.1007/s00396-005-1373-7