Antibacterial Activity And Catalytic Reduction Of 4-nitrophenol And Methylene Blue On Mcm-41 Modified By Cunps

Résumé: This paper focuses on the modification of mesoporous silica MCM-41 by different aminosilanes in order to stabilize metallic copper nanoparticles. The obtained samples were examined towards the reduction of 4-nitrophenol (4-NP) and methylene blue (MB dye) in two different systems. Different analysis techniques were used in order to determine the properties of the obtained materials. The results showed that the dispersion of CuNPs on the surface of NH2-MCM-41 leads to remarkable catalytic properties. The sample functionalized by triamine and doped by CuNPs (Cu@MCM-3) was selected as the best catalyst towards the reduction of 4-NP and MB dye. In the simple system the rate constants for the reduction of 4-NP and MB were kapp = 0.026 and 0.021 s−1, respectively. In the binary system containing a mixture of pollutants (4-NP/MB dye), the catalyst Cu@MCM-3 was more selective towards the MB dye. The catalyst Cu@MCM-3 was used in three successive cycles during the reduction of MB dye. The results showed that this material was stable and efficient with a slight increase in reaction time. These solids also have been employed as antibacterial agents via Staphylococcus aureus ATCC. All the solids have shown interesting antibacterial activity via S. aureus ATCC, but the Cu@MCM-1 was selected as the best material in terms of efficacy.

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