A Novel Z-scheme Photocatalyst Porous g-C3N4 Nanosheet/Ag3PO4 Decorated with N-doped CDs for High Efficiency Removal of Antibiotic.
A number of porous g-C3N4 nanosheet/Ag3PO4/NCDs (PCNNS/AP/NCDs) with a little amount of Ag3PO4 were synthesized via an in-situ sedimentation-calcination method. Moreover, the PCNNS/AP/NCDs photocatalyst exhibited excellent photocatalytic performance for the photocatalytic degradation of tetracycline (TC) under visible light irradiation with the removal rate of 90.5% in 40 min. The study of reaction kinetics of as-prepared samples was in accordance with the pseudo-second-order kinetics with correlation coefficient (R2) greater than 0.9776. Meanwhile, the photocatalyst was capable to degrade ciprofloxacin (CIP), and made a good performance even under actual water condition with natural sunlight irradiation, indicating that the photocatalyst has a wide application in practical situations. In addition, the photocatalytic performance, the XRD and FTIR spectra had shown no obvious changes even after four photocatalytic degradation cycles, which revealed the high stability of the PCNNS/AP/NCDs photocatalyst. Furthermore, the possible degradation pathways of TC and the possible Z-scheme mechanism was proposed with the ·O2− and h+ as the main active species contributed to photocatalytic degradation. The results provide novel insight into the fabrication of Z-scheme PCNNS/AP/NCDs and introduce Z-scheme PCNNS/AP/NCDs as an efficient visible-light-responsive photocatalyst for use in practical applications.