RADIATION SYNTHESIS AND CHARACTERIZATION OF CHITOSAN STABILIZED GOLD NANOPARTICLES AND CATALYTIC ACTIVITY STUDY
Keywords:gold nanoparticles, chitosan, irradiation, reduction, 4–nitrophenol.
In this paper, gold nanoparticles (AuNPs) were synthesized in a single and efficient procedure by e–beam and γ–irradiation using chitosan as a stabilizing agent. The investigations on synthesis of AuNPs under ionizing radiation by studying the influence of initial conditions of the preparation of Au(III)–chitosan solutions prior to irradiation on the nucleation process and on the morphological characteristic of the formed nanoparticles. The results of UV–vis absorption spectroscopy, transmission electron microscopy indicated that spherical well–dispersed gold nanoparticles ranging from 5 to 10 nm were elaborated, depending on the irradiation dose, the dose rate and the [GLA]/[Au(III)] ratio (GLA: glucosamine units). Furthermore, we also reported the application of the synthesized gold nanoparticles as catalyst in the reduction of 4–nitrophenol (4–NP) to 4–aminophenol (4–AP) by excess sodium borohydride.
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