In situ preparation of uniform Ag NPs onto multifunctional Fe3O4@SN/HPW@CG towards efficient reduction of 4-nitrophenol

摘要: Novel protocol towards multifunctional magnetic organic–inorganic core–shell nanostructured catalysts of Fe3O4@SN/HPW@CG–Ag with tailored properties are presented in this work. Such nanocomposites congregate the and functions a single component into whole. For instance, Fe3O4 cores protected by amino-functionalized SiO2 shell endowed composites superparamagnetism (28.6 emu g−1) thereby facilitate process separation recovery. Phosphotungstic acid, as bridging agent, provided strong interaction for anchoring glutaraldehyde cross-linked chitosan onto surface Fe3O4@SN. More interestingly, could simultaneously behave stabilizer reductant situ synthesis “green” Ag NPs without addition any other reducing agent or organic solvent, compounds catalytic performance. Further size, loading thickness layer were all controllable. Meaningfully, as-synthesized catalyst exhibited an exceptional performance reduction 4-nitrophenol presence sodium borohydride (the reaction was accomplished within 7 min) be reused at least 10 times good stability means convenient separation. Thence, design philosophy robust Ag-based nanocatalysts may pave way systems long-term stability.