Introduction of ZIF-67 shell in NiCo2O4 nanocage to enhance peroxymonosulfate activation based on nonradical pathway for effective removal of organic contaminant

•A newly-designed NiCo2O4@ZIF-67 core–shell nanocage was elaborately prepared.•Introduction of ZIF-67 film enhanced water stability and anti-interference of NiCo2O4.•NiCo2O4@ZIF-67-mediated the electron transfer between TC and PMS played a major role.•The utilization efficiency of PMS was improved after the introduction of ZIF-67.•Proposed NiCo2O4@ZIF-67/PMS oxidation system had excellent application potential.