Lattice oxygen activation of MnO by CeO for the improved degradation of bisphenol A in the peroxymonosulfate-based oxidation.

The structure of MnO was modified by constructing the composites CeO/ MnO via a facile hydrothermal method. The catalytic performance of optimal composite (Mn-Ce10) in peroxymonosulfate (PMS) activation for the degradation of bisphenol A (BPA) is approximately three times higher than that of MnO alone. The average valence of manganese in CeO/MnO is lowered compared to MnO, which induces the generation of more free radicals, such as OH and SO. In addition, the composite exhibits a higher concentration of oxygen vacancies than MnO, facilitating bondingwith PMS to produce more singlet oxygen (O). Moreover, the incorporation of CeO activates the lattice oxygen of MnO, improving its oxidative ability. Consequently, approximately 48% of BPA decomposition in 10min is attributed to direct oxidation in the Mn-Ce10/PMS system, whereas only 36% occurs in 30min for the MnO/PMS system. Simulation results confirm weakened Mn-O covalency and elongated Mn-O bonds due to the activation of lattice oxygen in CeO/MnO, demonstrating that PMS tends to be adsorbed on the composite rather than on MnO. This work establishes a relationship between lattice oxygen and the degradation pathway, offering a novel approach for the targeted regulation of catalytic oxidation.