Surface lattice oxygen mobility inspired peroxymonosulfate activation over Mn2O3 exposing different crystal faces toward bisphenol A degradation

The rod-like, spherical, flake-like and granular Mn2O3 microcrystals exposing different crystal faces were prepared and used for peroxymonosulfate (PMS) activation to degrade bisphenol A (BPA). Granular Mn2O3-P exposing (2 1 1) and (2 2 2) crystal faces displayed the superior degradation efficiency toward BPA than the other three samples. DFT results pointed out that the migration energy barriers of lattice oxygen on crystal faces (2 2 2) and (2 1 1) were lower than that of face (4 0 0). Moreover, the adsorption energies of PMS molecules on faces (2 2 2) and (2 1 1) were more negative. The high lattice oxygen migration of faces (2 1 1) and (2 2 2) and MnⅣ-MnIII/Ⅱ conversion were contributory to the generation of oxygen vacancies to adsorb PMS and O2, leading to the production of more active species (SO4•-, •OH and 1O2) in the catalytic process. This work contributes an excellent catalyst with efficient catalytic performance and cycle stability for water pollution treatment.