Metal nanoparticles of Ag, Au, Pt, and Pd were prepared in aqueous solutions via a rapid microwave-assisted green method using beet juice, an abundant sugar-rich agricultural product, which served as both a reducing and a capping reagent. The Ag nanoparticles with capping prepared using beet juice exhibit higher catalytic activity and durability than those prepared using NaBH4 for the transformation of 4-nitrophenol to 4-aminophenol.
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