Synthesis of novel ultrasmall Au-loaded magnetic SiO2/carbon yolk-shell ellipsoids as highly reactive and recoverable nanocatalysts

摘要: Abstract A facile synthetic strategy was developed for novel Au-loaded magnetic SiO2/carbon yolk-shell ellipsoids (Fe@SiO2-Au@H-C) composing of Fe@SiO2 yolks, mesoporous carbon shells and numerous sub-3 nm Au nanoparticles (NPs). The SiO2/polymer resin double-shell structures (Fe2O3@SiO2@RF) were prepared by the one-pot extended Stober method, followed carbonization-hydrothermal etching to attain hierarchical architectures (Fe2O3@SiO2@H-C) with shells. H2 annealing reduction based on unique deposition-precipitation method mediated Au(en)2Cl3 compounds post conducted accomplish both in-situ encapsulation ultrasmall NPs integration inner entrapped Fe cores strong magnetism. Hybrid formation hollow amorphous yolk discernable in morphologies Fe@SiO2-Au@H-C ellipsoids, embedded displayed excellent dispersibility enhanced thermal stability due protection ethylenediamine stabilizer. With merits configural advantages synergy dual movable Au-embedded yolk/shell structures, as nanocatalysts shown outstanding activity reusability toward 4-nitrophenol organic dyes, appeared highly recoverable well-preserved initial during recycling processes.