In-situ growth of C-F@CCS@ZIF8/67-1/1 photocatalysts with internal electric field and interfacial enhancement on cobalt-copper foam surface for simultaneous removal of ciprofloxacin and Cr(VI)

ZIF8/67-1/1 and CuCo2S4 were grown on the surface of cobalt-copper foam by in-situ growth method, and p-n heterostructures were formed by induction of internal electric field. The DFT calculation reveals that the energy levels near the Fermi level are gradually distributed continuously after ZIF8/67-1/1 and CuCo2S4 recombination, which accelerates electron conduction. Furthermore, the electron orbitals in the composite structure are real-located and the electrical conductivity of the interface is improved. This strong interfacial enhancement pro-motes the transfer of photoexcited electrons and promotes the photoinduced separation of electron-hole pairs. Thanks to the surface oxygen vacancy and unique structure, C-F@CCS@ZIF8/67-1/1 composites can simulta-neously achieve 97.2% ciprofloxacin (CIP) degradation and 96.5% Cr(VI) reduction. This catalyst does not require any recycling process and remains structurally stable during use with only a minimal amount of metal leaching. This work also reveals the mechanism of heterojunction formation between metal-organic frameworks and sulfides, broadening their application potential.