Abstract
Herein, we have reported a facile and green synthesis approach of Ag NP decorated reduced graphene oxide (RGO) through an in situ self-assembly method in the presence of l-methionine (l-Met) as reducing and stabilizing agent. The electronic properties, crystal structure, and morphology of the as-synthesized RGO–Ag nanocomposite were investigated by UV-Visible (UV-Vis) spectroscopy, Fourier transform-infrared (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) techniques. UV-Vis and FTIR show the effective reduction of GO and the formation of Ag NPs using l-Met. FESEM, TEM, and XRD analysis show the successful impregnation of Ag NPs into RGO with a 23 nm average crystallite size. The RGO–Ag nanocomposite with NaBH4 shows a fast-catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AMP). The enhanced catalytic activity of RGO–Ag nanocomposites can be attributed to the synergistic effect of improved adsorption capacity and the absence of agglomeration of Ag nanoparticles. Moreover, RGO–Ag showed strong antibacterial activity against B. subtilis and E. coli.
Highlights
graphene oxide (GO) was synthesised using as it is shown in S1.† The synthesis of reduced graphene oxide (RGO)–Ag nanocomposite was followed in situ reduction of AgNO3 using L-Met as a reducing agent and RGO as a platform to deposit Ag NPs
The catalytic activity of the synthesized RGO–Ag nanocomposites was investigated by performing a model reduction reaction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AMP) in the presence of sodium borohydride (NaBH4)
When a colloidal solution of GO is added to Agaq+ solutions, an electrostatic attraction leads to the self-assembly of cationic Agaq+ colloids on the anionic GO surface, and resultant composites precipitated from solution
Summary
The graphene–Ag nanocomposites have been exploited for multifunctional applications, including catalysis,[24] sensor,[25] imaging,[26,27] and energy storage.[28] in order to explore the potential application, it is of prime importance to the synthesis of these nanocomposite materials through a facile, large-scale production with quality and environmentally friendly approaches. The chemicals are highly noxious in nature, which is harmful to both the environment and humans. It needs to search for an alternative environmentally friendly reagent. We report a simultaneous reduction of GO and Ag+ using L-methionine (L-Met) in an in situ approach for the preparation of RGO–Ag nanocomposite. The study investigates the potential of L-Met for reduction of GO and Ag+. The prepared RGO–Ag nanocomposites were used as a catalyst for the reduction of 4-nitrophenol [4-NP] to 4-aminophenol [4AMP]. The antibacterial activities of RGO–Ag nanocomposite were investigated against B. subtilis and E. coli
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