Catalytic Reduction And Antibacterial Activity Of Mcm-41 Modified By Silver Nanoparticles

Résumé: In this work, the silica material was prepared by hydrothermal route using CTA+ as structuring agent. The uncalcined material was modified by silver nitrates solution giving the material Ag@MCM-41 and then by a chemical reduction treatment using NaBH4 leading to the formation of material AgNPs@MCM-41. The obtained samples were tested via the catalytic reduction of methylene blue (MB) dye in the presence of NaBH4 and also against different bacteria as an antibacterial agent. The physico-chemical properties of the different samples were evaluated by different analytical techniques such as XRD, FTIR, XPS and UV-vis DR. The obtained results clearly show that the silver nanoparticles AgNPs were well formed on the surface of the MCM-41 after the chemical treatment. The selected catalyst AgNPs@MCM-41 displayed significant catalytic activity with a full reduction time of 7 min and the rate constant kapp equal to 0.292 min− 1. Additionally, the uncalcined MCM-41 (parent material) shows good antibacterial activity against the pathogenic bacteria due to the presence of ammonium groups belonging to the CTAB surfactant molecules. Ag@MCM-41 and AgNPs@MCM-41 samples have also revealed a better efficiency at inhibiting the pathogenic bacteria and this, is due to the presence of both inorganic and organic antibacterial agents in MCM-41 silica materi

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