Abstract
This article displays synthesis of gold nanoparticles (Au NPs) decorated on sodium alginate (Alg) covered magnetite (Fe3O4@Alg-AuNPs) nanocomposite. Sodium alginate shell as a natural anionic polysaccharide on Fe3O4 microparticles core acted as a stabilizing agent for immobilization of Au NPs. Its catalytic performance was tested in the reduction of 4-nitrophenol to 4-aminophenol. The structural features of the synthesized nanocatalyst were investigated by Fourier-transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), Transmission electron microscopy (TEM), Energy Dispersive X-Ray Analysis (EDX), and Vibrating-sample magnetometer (VSM) studies. The catalytic activity of the material in the reduction process was quantitatively monitored using Ultraviolet–visible (UV–Vis) spectroscopy and it resulted excellent yields (99%) at short reaction time (1.5–4 min) in aqueous media at room temperature using very low catalyst load (1–3 mg). The kinetics study was also performed which afforded a good rate constant. Additionally, the catalyst showed high reproducibility as was easily retrievable and recoverable without noticeable loss in its catalytic activity.
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