Facile preparation of silver/reduced graphene oxide/chitosan colloid and application of the nanocomposite in antibacterial and catalytic activity

Abstract

Reduced graphene oxide (RGO) decorated with silver nanoparticles (AgNPs) was synthesized by a facile solution‐based approach in chitosan (CS) solution. The morphology and elemental composition of as‐prepared Ag/RGO/CS colloid were characterized by SEM and energy dispersive X‐ray spectroscopy, respectively. TEM images show that most of the AgNPs are uniformly dispersed in the CS matrix while the other nanoparticles are decorated on the RGO nanosheets. XRD indicates that the interlayer distance of RGO is between 0.34 and 1.87 nm while the diameter of face‐centered cubic AgNPs is no more than 30 nm. Fourier transform infrared spectroscopy of the Ag/RGO/CS colloid confirms the formation of AgNPs and RGO. X‐ray photoelectron spectroscopy proves that both the Ag − O bond and the C − N bond exist in the nanocomposite. Antimicrobial assays were performed using the most common species of Gram bacteria. The inhibitory effect indicates that the incorporation of AgNPs and RGO significantly improves the antimicrobial activity of CS colloid. In addition, the nanocomposite colloid exhibits significant catalytic activity toward the reduction of 4‐nitrophenol by NaBH4. © 2018 Society of Chemical Industry

A Novel Enzyme Biosensor Based on Ag/Reduced Graphene Oxide/Chitosan Membrane with Potentiometer for Pesticide Detection

“…Figure 2(c), SEM-mapping, illustrates that the formed membrane has a gap between particles with a high density, indicating a large surface area of the membrane formed. Based on the morphology of the synthesized membrane, the research reported by An et al, (2018) indicates that the morphology of Ag/rGO/CS colloids is very dense and has a large surface area. The large surface area and contact area of the synthesized membrane affect the bonding power between the matrix and filler and cause an increase in the contact between the transducer and the enzyme as a biological element, resulting in effective adsorption of the target molecule.…”

Biogenic Synthesis of Chitosan/Silver Nanocomposite by Escherichia coli D8 (MF062579) and its Antibacterial Activity

“…AgNPs are tightly connected to the CS OH groups, forming a network of polymeric chains that reduces NP aggregation and boosts stability (Kumar, 2000). Due to CS's antibacterial capabilities, the combination with AgNPs increased its effectiveness (An et al, 2018). In this study, silver nitrate was biologically reduced with E. coli D8 cell-free supernatant to biosynthesize AgNPs, which were then alternatively integrated into a chitosan matrix.…”

Untitled

“…The major phenolic compounds of licorice include glycosides of liquiritigenin (4,7-dihydroxyflavanone) and isoliquiritigenin (2,4,4-trihydroxychalcone) (Bethapudi et al, 2022). Licorice extract has been investigated as a substitute to bismuth that is normally used in quadruple therapy (Li et al, 2018). Bismuth protects against acid and pepsin secretions by covering the location of the lesion and promoting mucous secretion (Sreeja et al, 2020).…”