Interfacial engineering regulating electronic structure of homologous S-scheme Co3O4@C-TiO2 heterojunction for enhanced Fenton-like reaction activity

MOF-on-MOF (ZIF-67@MIL-125) derived S-scheme Co3O4@C-TiO2 (Co@Ti) homologous heterojunction is fabricated with a precisely regulated d-band center by constructing tight interface to enhance the Fenton-like activity. The regulation of d-band center of Co@Ti enhances the peroxymonosulfate (PMS) adsorption and the electron transfer rate, boosting the chloroquine phosphate (CQ) degradation rate constant by more than 20 times. Moreover, the self-made reactor adopting Co@Ti/graphite felt (GF) as immoblized catalyst accomplished long-term and continuous 100.0 % CQ degradation efficiency in the simulated pulluted aqueous solution formulated from tap water up to 168.0 h. For the first time, the newly-developed feature-based molecular networking (FBMN) technique is applied to analyze the intermediate products of CQ, which improved the efficiency and accuracy in analyzing intermediate products of various micropollutants. This work provides valuable guidance to regulate electronic structure of the catalyst by constructing MOF-on-MOF derived homologous heterojunctions with tight interface for enhanced Fenton-like ability toward water purification.