Fabrication of silver nanoparticles doped in the zeolite framework and antibacterial activity

Abstract

Using the chemical reduction method, silver nanoparticles (Ag NPs) were effectively synthesized into the zeolite framework in the absence of any heat treatment. Zeolite, silver nitrate, and sodium borohydride were used as an inorganic solid support, a silver precursor, and a chemical reduction agent, respectively. Silver ions were introduced into the porous zeolite lattice by an ion-exchange path. After the reduction process, Ag NPs formed in the zeolite framework, with a mean diameter of about 2.12–3.11 nm. The most favorable experimental condition for the synthesis of Ag/zeolite nanocomposites (NCs) is described in terms of the initial concentration of AgNO 3 . The Ag/zeolite NCs were characterized by ultraviolet-visible spectroscopy, powder X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy dispersive X-ray fluorescence, and Fourier transform infrared. The results show that Ag NPs form a spherical shape with uniform homogeneity in the particle size. The antibacterial activity of Ag NPs in zeolites was investigated against Gram-negative bacteria (ie, Escherichia coli and Shigella dysentriae ) and Gram-positive bacteria (ie, Staphylococcus aureus and methicillin-resistant Staphylococcus aureus ) by disk diffusion method using Mueller–Hinton agar at different sizes of Ag NPs. All of the synthesized Ag/zeolite NCs were found to have antibacterial activity. These results show that Ag NPs in the zeolite framework can be useful in different biological research and biomedical applications.

Biosynthesis characterization of silver nanoparticles using Cassia roxburghii DC. aqueous extract, and coated on cotton cloth for effective antibacterial activity

“…32 This could be the reason why they showed high antibacterial activity. 33,34 antimicrobial activity of agNPs loaded on cotton fabrics and SeM studies…”

Matrix effect of montmorillonite and MCM-41 matrices on the antibacterial activity of Ag2CO3 nanoparticles

“…The results are comparable to other reports. Some studies demonstrated that Ag + in Mt (Shameli et al, 2011b), Ag nanoparticles in zeolite (Shameli et al, 2011a) and Ag/AgCl nanoparticles (Gopinath et al, 2013) inhibited antibacterial activity similar to Ag 2 CO 3 -MCM-41. However, Ag nanoparticles in bentonite matrix (Gopinath et al, 2013) showed low inhibition like the Ag 2 CO 3 -Mt in this study (Table 2).…”

Silver nanoparticles embedded in zeolite membranes: release of silver ions and mechanism of antibacterial action

“…Recently, there has also been a report of AgNP in zeolite powders and their activity towards Gram-positive and Gramnegative bacteria. 11 In this study, we investigated the antibacterial capacity of AgNP embedded in zeolite membranes (AgNP-ZM) and found that their bactericidal properties stem from the gradual release of Ag + into the media. From a materials perspective, zeolite membranes are more attractive as supports than powders, since macroscopic membranes can be grown on ceramics, metals, and polymeric and cellulose supports, 12 thus allowing for diverse applications, including use in the hospital setting.…”