Abstract
In this study, PPy@Ag/rGO nanocomposites were successfully synthesized via the one-pot hydrothermal method using graphene oxide, pyrrole monomer and silver nitrate. The structures and morphologies of as-obtained PPy@Ag/rGO ternary nanocomposites were systematically investigated by scanning electron microscopy (SEM) and transmission electron microscope (TEM). It was found that the PPy@Ag NPs were well distributed on the reduction graphene oxide nanoflakes. The minimum inhibitory concentration (MIC) demonstrated that the PPy@Ag/rGO had enhanced antimicrobial efficiency with Gram-negative (Escherichia coli) bacteria compared with that at the same concentration of silver. From liquid antibacterial cycle experiments, the addition of polypyrrole contributes to the stability of nanosilver and reducing the loss of nanosilver. After several cycles, the antibacterial rate of PPy@Ag/rGO nanomaterials can still be maintained above 90%. In addition, the photocatalytic degradation of tetracycline (TC) under visible light displayed that the composite had good photocatalytic activity and catalytic stability.
Highlights
Nano silver and silver compounds have potential antibacterial activity against a far-ranging of microorganisms
The angles of diffraction peaks of Ag/Reduced graphene oxide (rGO) and PPy@Ag/rGO nanocomposites are at 2θ = 37.9 ̊, 44.1 ̊, 64.3 ̊ and 77.3 ̊ assigned to Bragg's reflections from the (111), (200), (220) and (311) planes of nano silver, which is in agreement (JCPDS No 00-001-1164) [44]
The diffraction peaks of graphene oxide (GO) in the nanocomposites PPy@Ag/rGO and Ag/rGO are weakened or almost disappeared, owing to the GO layer is ultrasonically stripped and hydrothermally reduced [43]. It proves that the PPy@Ag/rGO, PPy/rGO and Ag/rGO nanocomposites have been successfully prepared
Summary
Nano silver and silver compounds have potential antibacterial activity against a far-ranging of microorganisms. Reduced graphene oxide (rGO) is acknowledged as a single layer of carbon atoms that forms a serried honeycomb structure with oxhydryl and epoxy functional groups on two approachable sides and carboxyl groups on the brinks [14,15,16] These functional groups can better support other materials such as nanometals on the surface of rGO. In 2010, the research first reported the antibacterial activity of graphene oxide (GO) and rGO, where graphene-based nanomaterials have been shown to be effective in choking back the propagation of E.coli [17]. RGO has inimitable characteristics, including comparatively large specific surface area, lower cytotoxicity and favourable water stability [23, 24] It can be used as a plain stage for growth of metal nanoparticles. We further studied the antibacterial effect of PPy on the liquid antibacterial cycle experiment
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