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Abstract
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In this study, graphene oxide was modified during consecutive functionalization steps with 1,4-diphenylamine, cyanuric chloride, and ethylenediamine. Then, star-shaped CuO nanoparticles were synthesized on
modified graphene oxide using the seed-mediated growth method in which
nucleation, growth stages, and reduction of graphene oxide to graphene
occurred simultaneously. After ensuring successful synthesis of CuO
nanoparticles and to facilitate recycling, a magnetization process was utilized
by adding iron oxide nanoparticles. This nanocomposite was characterized by
transmission electron microscopy, X-ray powder diffraction, scanning electron
microscopy, and Fourier transform infrared spectroscopy. The prepared heterogeneous catalyst was investigated for the reduction of organic dyes in the
presence of NaBH4 as a reducing reagent. The kinetic data obtained for the
reduction of methyl orange (MO), methylene blue (MB), 4-nitrophenol (4-NP),
and rhodamine 6G (Rh6G) were fitted to first-order rate equations, and the calculated rate constants for the reduction of MO, MB, 4-NP and Rh6G were as
follows: −0.091, −0.071, −0.045, and 0.040, respectively. As star-shaped CuO
nanoparticles showed a higher antibacterial effect compared to sphericalshaped CuO nanoparticles, the antibacterial activity of star-shaped CuO
nanoparticles immobilized on magnetic functionalized graphene was evaluated against Gram-positive and Gram-negative bacteria through an agar well
diffusion assay and demonstrated more antibacterial activity against gram-positive bacteria.
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