Oxidation of an organic dye catalyzed by MnOₓ nanoparticles
2012
(Matthias),
We present a study on the catalytic oxidation of the organic dye morin by hydrogen peroxide in the presence of manganese oxide nanoparticles in aqueous solution. The ultrathin manganese oxide nanoparticles consist of c*-disordered potassium birnessite and are immobilized on spherical polyelectrolyte brushes. The catalytic activity of these composite particles was investigated using the oxidation of morin by hydrogen peroxide as a model reaction. The oxidative degradation of morin was followed by UV/vis spectroscopy leading to an apparent rate constant kₐₚₚ. We propose a modeling of the results in terms of a Langmuir–Hinshelwood model. kₐₚₚ can be related to the kinetic constant k and to the apparent adsorption constants of H₂O₂ and morin. Based on this model, the dependence of kₐₚₚ on temperature can be traced back to the activation energy of the rate constant k and the adsorption enthalpies of both educts on the surface of the nanoparticles.
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