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Catalytic reduction of organic pollutants, antibacterial and antifungal activities of AgNPs@CuO nanoparticles-loaded mesoporous silica. | LitMetric

AI Article Synopsis

  • The mesoporous silica MCM-41 was synthesized and modified with silver and copper for use as antibacterial/antifungal agents and catalysts to reduce various dyes like Methylene Blue and Congo Red.
  • The catalysts were thoroughly characterized, revealing that calcination led to well-distributed copper oxide and silver nanoparticles, which significantly influenced their catalytic activity and efficiency in dye reduction.
  • The Ag-Cu-MCM(0.05) catalyst exhibited the highest activity, especially in single-dye systems, and showed improved selectivity for Methylene Blue in binary systems, while uncalcined materials demonstrated superior antibacterial and antifungal properties due to the synergy between copper and silver species.

Article Abstract

In this work, the mesoporous silica MCM-41 was prepared by a hydrothermal method and then modified using silver and copper. The obtained samples were used as antibacterial/antifungal agents and as catalysts for the reduction of the following dyes: Methylene Blue (MB), Congo Red (CR), Methyl Orange (MO), and Orange G (OG). Several parameters affecting the reduction of dyes were investigated and discussed such as the catalyst nature, the initial concentration of the dye, the dye nature, the selectivity of the catalyst in a binary system as well as the catalyst reuse. The catalysts were characterized using XRD, nitrogen sorption measurements, XRF, FTIR, XPS, SEM/EDS, and TEM. XRD, XPS, and TEM analysis clearly showed that the calcination of copper- and silver-modified silica leads to the formation of well-dispersed CuO and AgNPs having sizes between 5 and 10 nm. As determined by XRF analysis, the content of silver nanoparticles was higher compared to CuO in all samples. It has been shown that the dye reduction is influenced by the size and the content of nanoparticles as well as by their dispersions. The catalytic activity was shown to be the highest for the Ag-Cu-MCM(0.05) catalyst with a rate constant of 0.114, 0.102, 0.093, and 0.056 s for MO, MB, CR, and OG dyes in the single-dye system, respectively. In the binary system containing MB/OG or MB/MO, the catalyst Ag-Cu-MCM(0.05) was more selective toward the MB dye. The reuse of the catalyst for three consecutive cycles showed higher MB conversion in a single system with an increase in reaction time. For antifungal and antibacterial properties, the application of calcined and uncalcined materials toward six different strains showed good results, but uncalcined materials showed the best results due to the synergistic effect between CuO and unreduced species Ag which are considered responsible for the antibacterial and antifungal action.

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Source
http://dx.doi.org/10.1007/s11356-022-24317-6DOI Listing

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