Degradation of Methylene Blue Using Hydrothermally Synthesized α-Manganese Oxide Nanostructures as a Heterogeneous Fenton Catalyst

Figure 7

Probable adsorption-oxidation-desorption mechanism for the degradation of MB by H₂O₂ over MnNSs: (a) H₂O adsorption on MnNSs surface; (b) H₂O₂ adsorption and desorption of H₂O; (c) H₂O₂ decomposition to free radicals and their adsorption on the MnNSs surface; and (d) oxidative degradation of MB by the free radical species followed by the desorption of the degraded products off the surface of the catalyst.