Structure Characterization and Antibacterial Performance of AgCl-Curcumin-g-C₃N₄

In order to solve the low performance of killing pathogenic microorganisms for carbon nitride with few surface active sites, AgCl-curcumin-g-C₃N₄ compound fungicides were prepared by pyrolysis using curcumin, silver nitrate and urea as raw materials. The antibacterial activity of AgCl-Cur-g-C₃N₄ with different curcumin loads was compared and the encapsulation efficiency of curcumin was investigated in this study. The physical properties and structural changes of the AgCl-Cur-g-C₃N₄ were analyzed and its cytotoxicity was also investigated. The catalytic bactericidal performance against Escherichia coli and Staphylococcus aureus was investigated by plate colony counting method and bacteriostatic zone method. The results showed that when the loading amount of curcumin was 0.005 g, the composite fungicide AgCl-Cur-g-C₃N₄ had the best antibacterial effect, and the encapsulation rate of curcumin reached 85.7%±0.3%. Curcumin and AgCl were uniformly dispersed in the layer structure of g-C₃N₄, and silver existed in the state of silver ion. Compared with AgCl-g-C₃N₄, under the synergistic action of curcumin and AgCl, the removal rate of Escherichia coli and Staphylococcus aureus reached 100% after exposure to natural light for 1.0 h. The compound fungicides had the excellent bactericidal performance and the lower cytotoxicity. The compound bactericide not only had good bactericidal performance, but also was a green functional material. As a new bactericidal material with broad spectrum bactericidal effect, it was expected to be used in the field of food hygiene.