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Article Dans Une Revue Nanoscale Année : 2014

Silver confined within zeolite EMT nanoparticles: preparation and antibacterial properties

Résumé

The preparation of pure zeolite nanocrystals (EMT-type framework) and their silver ion-exchanged (Ag+-EMT) and reduced silver (Ag0-EMT) forms is reported. The template-free zeolite nanocrystals are stabilized in water suspensions and used directly for silver ion-exchange and subsequent chemical reduction under microwave irradiation. The high porosity, low Si/Al ratio, high concentration of sodium and ultrasmall crystal size of the EMT-type zeolite permitted the introduction of a high amount of silver using short ion-exchange times in the range of 2–6 h. The killing efficacy of pure EMT, Ag+-EMT and Ag0-EMT against Escherichia coli was studied semi-quantitatively. The antibacterial activity increased with increasing Ag content for both types of samples (Ag+-EMT and Ag0-EMT). The Ag0-EMT samples show slightly enhanced antimicrobial efficacy compared to that of Ag+-EMT, however, the differences are not substantial and the preparation of Ag nanoparticles is not viable considering the complexity of preparation steps.

Domaines

Chimie

Dates et versions

hal-01840261 , version 1 (16-07-2018)

Identifiants

Citer

Biao Dong, S Belkhair, Moussa Zaarour, L Fisher, V Verran, et al.. Silver confined within zeolite EMT nanoparticles: preparation and antibacterial properties. Nanoscale, 2014, 6 (18), pp.10859. ⟨10.1039/C4NR03169E⟩. ⟨hal-01840261⟩
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