Due to modernization and the scarcity of fossil fuel resources, energy demand is continuously increasing. In this regard, it is essential and necessary to create a renewable energy source that can meet future energy demands. Recently, the production of H₂ by water splitting and removing pollutants from the water has been essential for issues of energy and environmental demands. Herein, g-C₃N₄ and Ag-g-C₃N₄ composite structures have been successfully fabricated by the ultrasonication method. The physio/photochemical properties of prepared g-C₃N₄ and Ag-g-C₃N₄ were examined with different analytical techniques such as FTIR, XRD, UV-DRS, SEM, TEM, PL, and XPS analyses. The silver quantum dots (QDS) anchored to g-C₃N₄ structures performed the profound photocatalytic activities of H₂ production, dye degradation, and antimicrobial activity under visible-light irradiation. The Ag/g-C₃N₄ composite with an Ag loading of 0.02 mole has an optimum photoactivity at 335.40 μmol g^-1 h^-1, which is superior to other Ag loading g-C₃N₄ composites. The synthesized Ag/g-C₃N₄ nanoparticles showed potential microbial inhibition activity during the preliminary screening, and the inhibition zones were comparable to the commercial antibiotic chloramphenicol. The loading of Ag into g-C₃N₄ paves the suppression, recombination and transfer of photo-generated electron-hole pairs, leading to the enhancement of hydrogen production, the diminishment of pollutants in water under visible light irradiation, and antimicrobial activity against multidrug-resistant pathogens.

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