Green Synthesis of Au-NPs on g-C(3)N(4) Hybrid Nanomaterials Based on Supramolecular Pillar[6]arene and Its Applications for Catalysis

[Image: see text] Gold nanoparticles (Au NPs) are installed in situ on the surfaces of graphitic carbon nitride (g-C(3)N(4)) based on supramolecular hydroxylatopillar[6]arene (P6). The Au NPs can be obtained via the redox reaction between HAuCl(4) and P6 without any NH(2)–NH(2), NaBH(4), and other reductants, where AuCl(4)(–) is reduced to Au(0) by the −OH groups in the presence of OH(–), and the −OH groups are oxidized into −COOH. First, P6 is loaded onto the surface of g-C(3)N(4) via π–π interaction between P6 and g-C(3)N(4), which offers a stabilized and reduced site for in situ anchoring of Au NPs. The hybrid nanomaterial Au-NPs@P6@g-C(3)N(4) exhibits higher catalytic capability than the Pd/C catalyst in 4-nitrophenol (4-NP) reduction and methylene blue degradation, which opens a new avenue for designing more efficient hybrid nanomaterials for application in catalysis, sensing, and other fields.