Zeolite omega-confined silver nanoparticles AgNPs for antibacterial activities and catalytic reduction of organic contaminants

Document Type

Article

Source of Publication

Journal of Water Process Engineering

Publication Date

2-1-2025

Abstract

Dyes have a significant impact on the environment, particularly in industrial sectors such as textile and food. One of the fastest reactions to reduce the toxicity of these pollutants is the reduction of dyes. This research employed a straightforward and efficient approach to confine omega zeolites with various concentrations of silver nanoparticles AgNPs (1, 2, 3, and 4 %). The resulting solids were used as catalysts to reduce methylene blue (MB), orange G (OG), methyl orange (MO) and 4-nitrophenol (4-NP) in a simple and binary system. It was found that AgNPs can be obtained at ultrafine sizes between 2 and 6 nm, with a high level of dispersibility on the zeolite surface. Both systems showed that the catalyst with a high AgNPs content was the most effective and selective with MB dye. The rate constant Kapp values (for a simple system) varied in the following sequence: 0.590 s−1, 0.0086 s−1, 0.0046 s−1, and 0.003 s−1 for the pollutants (MB), (MO), (OG), (4-NP), respectively. In binary systems containing 4-NP/MB, MO/MB, and OG/MB, the zeolite confined with 4 % AgNPs. Reusing the catalyst ZO(4 %) in several cycles showed good results in terms of conversion and stability. AgNPs-confined zeolite omega showed the most marked antibacterial effects, with inhibition zones of 36 mm and 31 mm achieved for Escherichia coli E.c and Pseudomonas aeruginosa P.a, respectively. These values were higher than those found with the antibiotic gentamicin.

ISSN

2214-7144

Publisher

Elsevier BV

Volume

70

Disciplines

Life Sciences

Keywords

AgNPs loading, Antimicrobial activity, Dyes reduction, Surface modification, Zeolites omega

Scopus ID

85214708706

Indexed in Scopus

yes

Open Access

no

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