▎ 摘　　要

Graphene oxide (GO) supported mono (GO/Ru, GO/Ag and GO/Pd) and bimetallic (GO/Ru-Ag and GO/Ru-Pd) nanocomposites (NCs) were prepared via a simple chemical reduction method. The newly designed GO-supported mono and bimetallic NCs were characterized using various techniques, such as Fourier transform-infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDAX) and high resolution transmission electron microscopy (HR-TEM). Furthermore, the GO-supported mono and bimetallic NCs were utilized for the reduction of two organic dyes, crystal violet (CV) and malachite green (MG), using NaBH4 in an aqueous medium at 25 degrees C. The catalytic reaction followed pseudo-first-order reaction kinetics, as monitored using UV-visible spectroscopy. In addition to this, the antibacterial activity of these prepared mono and bimetallic NCs was studied against two Gram (+ve), Staphylococcus aureus (S. aureus) and Bacillus subtilis (B. subtilis), and two Gram (-ve) bacteria, Salmonella typhi (S. typhi) and Escherichia coli (E. coli). The bimetallic NCs exhibited excellent catalytic and antibacterial activity as compared to the monometallic NCs.