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Au-Ag/g-C₃N₄ nanohybrids <b>2</b>–<b>3</b> were synthesized by the one-pot self-reduction of the organometallic precursor [Au₂Ag₂(C₆F₅)₄(OEt₂)₂]_n in the presence of graphitic carbon nitride (g-C₃N₄), leading to two populations of alloyed Au-Ag nanoparticles (NPs) of different size and composition on the surface of g-C₃N₄, i.e., Ag-enriched Au-Ag NPs of smaller size and Au-enriched Au-Ag NPs of larger size. The combination of these two types of plasmonic NPs with g-C₃N₄ semiconductor displays enhanced photocatalytic properties towards the degradation of ibuprofen under visible light by the increased charge carrier separation provided by the inclusion of the plasmonic NPs on g-C₃N₄.