Abstract
Magnetic nanoparticles have emerged as a promising tool for wastewater treatment due to their unique properties. In this regard, Co0.33Mg0.33Ni0.33SmxFe2-xO4 (0.00 \(\le\) x \(\le\) 0.08) nanoparticles were prepared to examine their magnetic separation efficiency (MSE), photocatalytic, antibacterial, and antibiofilm performances. Pure nanoparticles, having the highest saturation magnetization (Ms = 31.87 emu/g), exhibit the highest MSE, where 95.6% of nanoparticles were separated after 20 min of applying a magnetic field of 150 mT. The catalytic performance of the prepared samples is examined by the photodegradation of rhodamine B (RhB) dye exposed to direct sunlight radiation. Improved photocatalytic activity is exhibited by Co0.33Mg0.33Ni0.33Sm0.04Fe1.96O4 nanoparticles, labeled as Sm0.04, where the rate of the degradation reaction is enhanced by 4.1 times compared to pure nanoparticles. Rising the pH and reaction temperature improves the rate of the photodegradation reaction of RhB. The incorporation of 15 wt% reduced graphene oxide (rGO) with Sm0.04 enhanced the rate of the reaction by 1.7 and 2.4 times compared with pure Sm0.04 sample and rGO, respectively. The antibacterial and antibiofilm activities against Escherichia coli, Leclercia adecarboxylata, Staphylococcus aureus, and Enterococcus faecium are assessed by the minimum inhibitory concentration (MIC) and the minimum bactericidal concentration (MBC) broth microdilution, the agar well diffusion, the time-kill assays, the biofilm formation, and destruction assays. The bacteria used in these assessments are isolated from wastewater. The nanoparticles exhibit a bacteriostatic activity, with a better effect against the Gram-positive isolates. Co0.33Mg0.33Ni0.33SmxFe2O4 (x = 0.00) nanoparticles have the best effect. The effect is exerted after 2–3 h of incubation. Gram-positive biofilms are more sensitive to nanoparticles.
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All authors contributed to the study conception and design. Conceptualization: Daoud Naoufal, Mahmoud I. Khalil, and Ramadan Awad; data curation: Amani Aridi, Mariam Rabaa, and Malak Mezher; formal analysis, investigation, and methodology: Amani Aridi, Mariam Rabaa, Malak Mezher, Daoud Naoufal, Mahmoud I. Khalil, and Ramadan Awad; resources: Daoud Naoufal, Mahmoud I. Khalil, and Ramadan Awad; software: Amani Aridi and Malak Mezher; supervision: Daoud Naoufal, Mahmoud I. Khalil, and Ramadan Awad; writing—original draft, Amani Aridi, Mariam Rabaa, and Malak Mezher; writing—review and editing: Amani Aridi, Mariam Rabaa, Malak Mezher, Daoud Naoufal, Mahmoud I. Khalil, and Ramadan Awad. All authors have read and agreed to the published version of the manuscript.
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Aridi, A., Rabaa, M., Mezher, M. et al. Magnetic separation, sunlight-driven photocatalytic activity, and antibacterial studies of Sm-doped Co0.33Mg0.33Ni0.33Fe2O4 nanoparticles. Environ Sci Pollut Res (2024). https://doi.org/10.1007/s11356-024-33641-y
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DOI: https://doi.org/10.1007/s11356-024-33641-y