▎ 摘　　要

Graphene oxide templated cobalt (GO-Co) and graphene oxide templated silver (GO-Ag) nanocomposites were synthesized and used as catalysts in the reduction of 4-Nitrophenol (4-NP), 2-Nitrophenol (2-NP) and 2-Nitroaniline (2-NA). Almost evenly distributed nanoparticles of Ag and Co were obtained on GO sheets and the diameters of most of the particles were in the range of 5-15 nm. The maximum apparent reduction rate (k (app)) for 4-NP was found to be 0.58 min(-1) and 0.67min(-1) with corresponding activation energies of 28.79 and 16.54 kJ mol(-1) in the presence of GO-Ag and GO-Co catalysts, respectively. The k (app) for GO-Co cataly-zed reduction of 2-NP and 2-NA were found as 0.10 and 0.06 min(-1), respectively. Catalytic activity of GO-Ag was decreased by 25% in the fifth cycle while that of GO-Co was decreased to 47% in the fourth cycle for the reduction of 4-NP. Overall, GO-Ag showed superior catalytic behaviour as compared to GO-Co.