Oxygen-deficient LaMnO3+δ tuned by electrochemical methods for peroxymonosulfate activation towards organics removal

This study aimed to construct a perovskite LaMnO 3+δ (LMO) with abundant oxygen vacancies (OVs) by an electrochemical approach at different potentials and figure out the role of OVs in peroxymonosulfate (PMS) activation. All modified samples achieved superior PMS activation activity than LMO (0.49 min −1 ) towards Rhodamine B (RhB) removal, LMO + 2 with more OVs showed the best performance (1.21 min −1 ). OVs regulated the Mn 3+ /Mn 4+ redox cycle and increased active sites, triggering RhB oxidation in LMO + 2/PMS system via a 1 O 2 -dominated nonradical pathway. These results suggest that perovskites efficiently enriched OVs through an electrochemical strategy and regulated activating PMS towards 1 O 2 -dominated oxidation.