Biogenic synthesis, characterization, antimicrobial, antioxidant, and catalytic applications of synthesized platinum nanoparticles (PtNPs) from Polygonum salicifolium leaves

Abstract The aqueous extract of P. salicifolium leaves was employed in the green synthesis of platinum nanoparticles (PS-PtNPs) by an immediate, one step, cost-effective procedure in the current investigation. PS-PtNPs were characterized via several techniques including UV-Visible spectroscopy, Fourier Transform Infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), High-resolution Transmission electron microscope (HRTEM), Selected Area Electron Diffraction (SAED), Energy Dispersive X-ray spectroscopy (EDX), EDX elemental mapping, and X-ray Photoelectron Spectroscopy (XPS) and Zeta potential. The produced PS-PtNPs were dark brown in color with almost spherical shape in the size range from 1-3 nm. The plasmon peak at 295 nm clarified the biogenic synthesis of PS-PtNPs utilizing P. salicifolium aqueous extract. Moreover, the synthesized PS-PtNPs possessed high stability due to its zeta potential of – 25.9 mV that confirmed by its stability for more than three months. PS-PtNPs were verified to be a superb catalyst as they were able to catalytically degrade MB with different concentrations up to 100 mg/L immediately. PS-PtNPs exhibited a high antibacterial efficacy against gram-negative bacteria. Furthermore, PS-PtNPs were proved to be a powerful antioxidant and also a promising antidiabetic agent. The obtained results offer a promising route of the biogenic synthesis of PtNPs using the aqueous extract of P. salicifolium.