Highly dispersed PVP-supported Ira??Ni bimetallic nanoparticles as high performance catalyst for degradation of metanil yellow

摘要

Bimetallic nanoparticles, a new class of materials for catalysis, were intensively investigated. Highly dispersed Ira??Ni bimetallic nanoparticles with varying mole fractions were synthesized by modified polyol reduction method from the solution of iridium trichloride and nickel chloride in ethylene glycol, which acts as both solvent and reducing agent. The particles were characterized for their size, morphology and composition using various techniques like UVa??Vis, Fourier transform infrared (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM) and X-ray photo electron spectroscopic (XPS) techniques. The synthesized nanoparticles were in pseudo-spherical morphology and utilized as catalyst for the degradation of dyes. The feasibility of degradation of an azo dye i.e., metanil yellow (MY) in aqueous alkaline medium by hexacynoferrate (III) ions using Ira??Ni bimetals as catalyst, prepared in different molar ratios, was investigated. Results show that Ira??Ni (2:1) bimetals have good catalytic activity and degradation as compared to Ira??Ni (1:2) due to their small size and high stability for the oxidation of MY.