Green synthesis of gold nanoparticles using Chrysophyllum cainito (Star apple) leaf extract: An effective homogeneous catalyst for reduction reaction
Keywords:
metal nanoparticles, green synthesis, Leaf extract of Chrysophyllum cainito, polyphenols, catalysisAbstract
The leaf extract of Chrysophyllum cainito has been exploited to synthesize stabilized colloidal gold nanoparticles (AuNPs) via an ecofriendly method. On addition of Au (III) salt to the aqueous leaf extract of Chrysophyllum cainito, the colorless solution turned reddish almost instantly which indicated the excellent efficacy of the leaf extract as reducing agent to reduce Au (III) to Au (0). The intensity of the red color was enhanced with time and this red color colloidal solution of AuNPs was stable for several months which confirmed the excellent efficacy of the leaf extract of Chrysophyllum caimito as stabilizing agent. The formation of stabilized AuNPs have been confirmed by UV-visible spectroscopy, high resolution transmission electron microscopy (HRTEM), dynamic light scattering (DLS) studies, and X-ray diffraction studies. The synthesized AuNPs have been utilized as efficient catalyst for reduction reaction of 3-nitrophenol and 4-nitrophenol with sodium borohydride.
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