1. Ag-Decorated Iron Oxides-Silica Magnetic Nanocomposites with Antimicrobial and Photocatalytic Activity.
- Author
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Muşat, Viorica, Crintea, Lenuța, Anghel, Elena-Maria, Stănică, Nicolae, Atkinson, Irina, Culiţă, Daniela Cristina, Baroiu, Liliana, Țigău, Nicolae, Cantaragiu Ceoromila, Alina, Botezatu, Andreea-Veronica, and Carp, Oana
- Subjects
PHOTOCATALYSTS ,IRON oxide nanoparticles ,ANTI-infective agents ,HYBRID materials ,NANOCOMPOSITE materials ,TRANSCRANIAL magnetic stimulation ,IRON oxides ,FERRIC oxide - Abstract
Nanotechnology offers unlimited possibilities for creating effective hybrid materials, which combine functional performance in environment depollution and antimicrobial defense with a lack of toxicity, biocompatibility, biodegradability, and natural availability. This paper presents the silver effect on photocatalytic and antibacterial activities of double-coated iron oxide nanoparticles (NPs), Fe
3 O4 @SiO2 /ZnO-Ag. The structural, morphological, and textural information of the, core–shell iron oxides-based superparamagnetic nanoparticles (IOMNPs) decorated with 5% Ag by ultrasound-assisted synthesis were evaluated by scanning electron microscopy with energy dispersive spectroscopy (SEM-EDX), X-ray diffraction, Raman spectroscopy, and Brunauer–Emmett–Teller physisorption measurements. Although two synthesis temperatures of 95 and 80 °C were used for the co-precipitated iron oxide cores, the XRD patterns revealed the formation of a single magnetite, Fe3 O4 , phase. The sorption–photocatalytic activities under dark and UV irradiation encountered a maximum removal efficiency of the MB (90.47%) for the Fe3 O4 @SiO2 /ZnO-Ag sample with iron oxide core obtained at 80 °C. The rate constant for the second-order kinetics was 0.0711 min−1 for 2 h, and the correlation coefficient R2 closed to unity. Two samples with Ag-decorated hybrid SiO2 /ZnO shell and hierarchically interconnected porous structure with large surface area (328.8 and 342.5 m2 g−1 ) exhibited the best disk diffusion antimicrobial activity against four microorganisms, especially gram-positive Staphylococcus aureus. [ABSTRACT FROM AUTHOR]- Published
- 2022
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