Influence of the surface hydroxyl groups of MnO x /SBA-15 on heterogeneous catalytic ozonation of oxalic acid.

Highlights: [•] Surface reaction plays the major role in O3/MnO x /SBA-15 for the removal of oxalic acid. [•] MnO x /SBA-15 benefits adsorption of oxalic acid and initiation of hydroxyl radicals. [•] Protonated surface hydroxyl groups are claimed to be the main active centers. [•] Multivalent MnO x with higher oxidation states contribute to electron transfer. [•] A possible mechanism of catalytic ozonation is proposed. [ABSTRACT FROM AUTHOR]