Kinetics study of a palladium–nickel colloidal nanocatalyst synthesized by a wet-chemical method for reduction of nitrophenol, nitroaniline, and 4-nitrobenzo-15-crown compounds

Abstract

Bimetallic, palladium-nickel (Pd-Ni) stable colloidal nanocatalyst was synthesized by wetchemical reduction technique using AOT as surfactant and hydrazine hydrate as a reducing agent.The particle size of colloidal nanocatalyst was controlled by varying precursor concentration, reducing agent, and surfactant concentration. The particle size and morphology of colloidal catalyst were investigated by dynamic light scattering (DLS) and transmission electron microscopy (TEM), respectively. TEM images shows the actual particle size of Pd-Ni nanocatalysts were in the range of 10-28 nm at 10 mM concentration of AOT and hydrazine hydrate. The activity of colloidal catalyst (bimetallic) was evaluated for reduction of nitro aromatic compounds which includes 4-NP, 3-NP, 2-NP, 4-nitrobenzo-15-crown and 4-NA. The rate constant of Pd-Ni colloidal nanocatalyst indicate that activity of bimetallic catalyst was higher than the monometallic catalyst for various nitro compounds. The rate constant of 4-nitrophenol was found to be ~61 × 10 2 min 1 at room temperature.

Hydrothermal Synthesis of Multifunctional Bimetallic Ag-CuO Nanohybrids and Their Antimicrobial, Antibiofilm and Antiproliferative Potential

“…Furthermore, the physicochemical features of the bimetallic nanoparticles have been shown to be significantly distinct from those of the individual metal particles [ 23 ]. For instance, the bimetallic platinum-palladium [ 24 ], gold-palladium [ 25 ], silver-nickel [ 26 ], palladium-silver [ 27 ] and platinum-nickel [ 28 ] NPs have shown enhanced catalytic, electronic, reducing and oxidation properties, respectively. The novelty of the bimetallic NPs’ characteristics and properties rely on the synergy between the two participating metals [ 29 ].…”