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Fe3O4 magnetic nanoparticles (MNPs) were modified with (3‐aminopropyl)triethoxysilane through silanization. An atom transfer radical polymerization‐initiating site immobilized onto amine‐functionalized Fe3O4 MNPs. The surface‐initiated atom transfer radical polymerization of 4‐vinylpyridine was then performed in the presence of Fe3O4–SiO2–Br nanoparticles, which led to the formation of Fe3O4–SiO2–P4VP [P4VP=poly(4‐vinylpyridine)] hybrid microgels cross‐linked with Fe3O4 MNPs. Our approach uses polymer microgels as templates for the synthesis of nickel nanoparticles (NiNPs). The tunable properties of synthesized NiNPs@Fe3O4–SiO2–P4VP pH‐sensitive microgels were used in the catalytic reduction of aliphatic and aromatic nitriles. Moreover, the catalytic activity of metal nanocomposites that can be modulated by the volume transition of microgel structures with changing pH has been evaluated. TEM, X‐ray photoelectron spectroscopy, thermogravimetric analysis, atomic absorption spectroscopy, XRD, UV/Vis spectroscopy, and FTIR spectroscopy were used to characterize the resultant catalyst.

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In this study, we report the synthesis and impressive performance of Fe(III)tetra(4sulfonatophenyl) porphyrins (FeTSPP) supported on S and N co-doped graphene quantum dots (S, N: GQDs) as efficient, recyclable, and noble metal free heterogeneous photocatalyst for the selective aerobic oxidation of alcohols to the corresponding carbonyl compounds. It was found that FeTSPP@S, N: GQDs photocatalyst represents a novel chemical function for efficient visible light catalyzed aerobic alcohol oxidation with good conversions and selectivity in water as a green solvent at room temperature. We envision that FeTSPP@S, N: GQDs provide a promising candidate for the development of highly efficient, recyclable, and industrially applicable photocatalyst in fine chemical production with high activity.