Silver Nanoparticles Incorporated on Natural Clay as an Inhibitor against the New ISO SS Bacteria Isolated from Sewage Sludge, Involved in Malachite Green Dye Oxidation.
Diana-Carmen MirilaRaducanu DumitraGeorgescu Ana-MariaAna-Maria RosuCiubotariu Vlad AndreiZichil ValentinIleana Denisa NistorPublished in: Molecules (Basel, Switzerland) (2022)
A facile, ecofriendly, and cost-effective method was developed to prepare a microporous material based on natural chemically modified bentonite with silver ions (BN-Ag 0 ). This material presents a good catalytic activity against Malachite Green (MG) dye and bacteriostatic activity against a newly isolated bacterium from sewage sludge named hereafter " ISO SS " and Escherichia coli ( E. coli ). BN-Ag 0 was characterized by the following methods: energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), Fourier-transform infrared (FTIR) spectroscopy, temperature programmed desorption (TPD) and X-ray Diffraction (XRD). The new bacterium ISO SS , was isolated using the technique of isolating a pure culture of anaerobically stabilized sludge. A mandatory characterization of ISO SS isolated strains from anaerobic stabilized sludge was performed in the process of identifying bacterial species. The cationic clay-based nanomaterial showed appreciable antibacterial activity against ISO SS , a Gram-negative bacterium. It also showed good activity against E. coli bacteria. As a catalyst in the catalytic ozonation of MG dye, BN-Ag 0 significantly improves the oxidation time of the dye, due to its good adsorption and catalytic properties. The catalytic and antibacterial activities of the natural bentonite (BN) and of BN-Ag 0 were examined using performant characterization techniques. The lifetime of the BN-Ag 0 catalyst was also evaluated. Results obtained are expected to provide valuable findings for the preparation of a good microporous material with multiple functionalities.
Keyphrases
- sewage sludge
- visible light
- electron microscopy
- highly efficient
- silver nanoparticles
- escherichia coli
- anaerobic digestion
- high resolution
- heavy metals
- gram negative
- quantum dots
- municipal solid waste
- multidrug resistant
- microbial community
- wastewater treatment
- crystal structure
- aqueous solution
- risk assessment
- hydrogen peroxide
- mass spectrometry
- magnetic resonance imaging
- computed tomography
- ionic liquid
- biofilm formation
- gold nanoparticles
- nitric oxide
- liquid chromatography