Encapsulate SrCoO3 perovskite crystal within molybdenum disulfide layer as core-shell structure to enhance electron transfer for peroxymonosulfate activation.

[Display omitted] • Stable encapsulated SC@MoS 2 crystal was facilely fabricated by hydrothermal method. • MoS 2 coating facilitated electron transfer and rapidly activated PMS to generate reactive oxygen species. • Oxygen defects and transition metals act as active sites for the activation of PMS. • Feasibility of SC@MoS 2 /PMS system was proved by organic pollutants degradation and reusability. Perovskite oxides and molybdenum sulfide (MoS 2) are both promising catalysts for advanced oxidation processes in environmental pollutant degradation. Herein, a core-shell structure of MoS 2 encapsulating Sr-Co perovskite microcrystalline (SC@MoS 2) was used to activate peroxymonosulfate (PMS) for degradation of organics. Levofloxacin (LVF) degradation by SC@MoS 2 /PMS system was improved obviously, and 0.2-SC@MoS 2 exhibited the optimized activation for PMS with best LVF degradation performance (97%) within 15 min. In the 0.2-SC@MoS 2 /PMS system, the dosage of catalyst was the key determinant of LVF degradation. Simultaneously, 0.2-SC@MoS 2 achieved outstanding reusability and good degradation capacity of different contaminants. The encapsulation of molybdenum disulfide layer facilitated electron transfer between PMS and core-shell structure. According to the EPR analysis and quenching experiments, both radicals (SO 4 − and OH), and nonradical (1O 2) were involved in the degradation of LVF. Under visible light irradiation, O 2 − participated in the reaction and enhanced LVF degradation efficiency, because the valence band and conduction band of components are different. Furthermore, the density functional theory (DFT) calculation, intermediates determination and Toxicity Estimation Software Tool (T.E.S.T) analysis provided meaningful support in the degradation pathways and ecological risks of LVF residues. [ABSTRACT FROM AUTHOR]