Biofabrication, characterization, and possible bio-reduction mechanism of platinum nanoparticles mediated by agro-industrial waste and their catalytic activity

• Pt-NPs are biofabricated using agro-industrial waste Punica granatum's peel.
• Pt-NPs are characterized by UV, DLS, TEM, XRD, EDX and FTIR.
• Spherical, crystalline Pt-NPs are synthesized within size range of 16–23 nm.
• 3-Nitrophenol is reduced by NaBH4 using colloidal Pt-NPs as catalyst.

The present study showed biofabrication of platinum nanoparticles (Pt-NPs) using agro-industrial waste Punica granatum's peel extract. Appearance of the broad spectrum from visible to the ultraviolet region, confirmed the biofabrication of Pt-NPs. Pt-NPs were spherical, within size range of 16–23 nm. XRD suggested the fabrication of crystalline Pt-NPs with (111) plane in predominant orientation. The negative ζ potential value of colloidal Pt-NPs revealed high stability. FTIR confirmed the role of hydroxyl and carbonyl groups of polyphenolic compounds of peel extract for biofabrication. The reduction of anthropogenic pollutant, 3-nitrophenol, by NaBH4 using colloidal Pt-NPs established it as an efficient “green catalyst.”

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