ZIF-67 derived magnetic Bi12O17Cl2/Y-TCPP/Co-NC double Z-scheme heterojunction enhanced photocatalytic performance for antibiotic degradation

In this work, Co-NC was obtained by pyrolysis of ZIF-67, coordination compound of meso-tetra (4-carboxyphenyl) porphyrin (TCPP) with Yttrium ion (Y-TCPP) was prepared by hydrothermal method, and Bi12O17Cl2/ Y-TCPP/Co-NC double Z-scheme heterojunction photocatalyst was synthesized by in-situ precipitation method. The photodegradation rate of levofloxacin (LVX) hydrochloride was as high as 98.01 % within 120 min. The amount of catalyst, the pH and concentration of the initial LVX solution were screened, and the optimal reaction conditions were obtained. Compared with the monomer catalyst, the reason for the increase in activity can be attributed to the carbon skeleton structure of Co-NC that can improve the electron transport efficiency and the broadened light absorption range of the electron transition of Y-TCPP; An organic-inorganic dispersed double Zscheme heterojunction was innovatively constructed, and the performance of the composite was improved by the band gap matching between the monomers and the synergistic effect of multiple components. At the same time, the excellent magnetic properties of the sample reduce the loss of the catalyst and improve the reuse efficiency. Finally, the photocatalytic mechanism of dispersed organic-inorganic double Z-scheme heterojunction was verified by various characterization methods and free radical capture experiments.