Size-Tailored Porous Spheres of Manganese Oxides for\nCatalytic Oxidation via Peroxymonosulfate Activation

Abstract

Highly\nporous and monodisperse manganese oxides with different\nparticle sizes were synthesized via a one-pot hydration and annealing\nprocess. Their catalytic performances were evaluated by the activation\nof peroxymonosulfate (PMS) to degrade phenol in aqueous solutions.\nThe effects of sphere size (200–500 nm), calcination temperature\n(200–1000 °C), catalytic stability (leaching problem and\nreusability), reaction kinetics, and reaction temperature (25–45\n°C) on the degradation efficiencies as well as the degradation\nmechanism were comprehensively studied. The small sized catalyst displayed\nthe best efficiency in decomposition of phenol, and the annealing\ntreatments would significantly improve the catalytic stability.