Tetracycline(4) [HRP]

A Z-scheme of 2D/2D BiOCl/g-C3N4 nanosheet-like composite was prepared by hydrothermal method. The properties of prepared samples were well tested by XRD, FT-IR, PL, EIS, SEM equipped with EDS, XPS, UV-Vis DRS analysis. After the BiOCl nanosheets anchored on g-C3N4 nanosheets, the BiOCl/g-C3N4-3 composite exhibited a remarkable photocatalytic efficiency and antimicrobial activity for tetracycline (TC). About 97.1% of TC degraded within 60 min and the TOC removal rate of TC reached to 76.3% in 180 min. Moreover, the E.coli reduction of antimicrobial activity reached to 96.5% after 40 min illumination. Those excellent photocatalytic efficiency of BiOCl/g-C3N4-3 composite was contribution of the rapid charge transfer in Z-scheme system. Finally, 4 cycles of photocatalytic experiments revealed an excellent stability and reusability of BiOCl/g-C3N4-3 composite.

The embedding of highly dispersed metal species can effectively enhance the photocatalysis of polymeric carbon nitride. In this work, we chose phosphomolybdic acid as a Mo-containing heteropoly acid precursor and dicyandiamine as a carbon and nitrogen source and prepared Mo-embedded polymeric carbon nitride by a one-step thermal polycondensation method. The Mo species was highly uniformly dispersed in the matrix of polymeric carbon nitride in a hexavalent state. Mo-embedded polymeric carbon nitride achieved the low recombination of photogenerated carriers, the fast photogenerated electron transfer and the large specific surface area. Meanwhile, the embedding of Mo reduced the bandgap of polymeric carbon nitride and increased its valence band position, thereby improving the visible light absorption and oxidation ability. These merits together afforded the high activity of Mo-embedded polymeric carbon nitride in visible light-induced photodegradation of rhodamine B and tetracycline hydrochloride.