ندا سیدی

In this research, a novel approach has been investigated for the fabrication of functionalized two-dimensional graphene oxide and promoted with phosphotungstic acid. First, PVP units with medium molecular weight were placed between graphene sheets for preparation of twodimensional graphene oxide and then the surface of 2D-graphene oxide modified with (3-chloropropyl)triethoxysilane and metformin respectively. Finally, prepared support prompted with phosphotungstic acid which has the role of theactive sites. This catalyst was characterized by transmission electron microscopy (TEM), X-ray powder diffraction (XRD), Scanning electron microscopy (SEM) and Fourier transforms infrared spectroscopy (FT-IR). 2D-GO-CPTESMet/H3PW12O40 have been used for the catalytic reduction of methyl orange (MO) and methylene blue (MB) in the presence of NaBH4 as a reducing reagent. The progress of the reaction was monitor by UV–Vis spectrophotometry at different times. The obtained kinetic data for the reduction of MO and MB were fitted to first-order rate equations and the calculated rate constants for the reduction of MO and MB were as follows 0.020 and 0.102 s -1 , respectively. The catalytic activity over 2D-GO-CPTES-Met/H 3PW 12O40 recycled catalyst remained at a satisfactory state after at least 10 runs