Influence of Lanthanum Doping on the Photocatalytic and Antibacterial Capacities of Mg0.33Ni0.33Co0.33Fe2O4 Nanoparticles

Abstract

The increase in environmental pollution, especially water pollution, has intensified the requirement for new strategies for the treatment of water sources. Furthermore, the improved properties of nano-ferrites permit their usage in wastewater treatment. In this regard, novel Mg0.33Ni0.33Co0.33LaxFe2−xO4 nanoparticles (NPs), where 0.00≤x≤0.08, were synthesized to test their photocatalytic, antibacterial and antibiofilm activities. The structural and optical properties of the prepared NPs were investigated by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), UV-Vis spectroscopy and photoluminescence (PL) analysis. As La content increases, the bandgap energy increases, whereas the particle size decreases. The photocatalytic activity of the prepared NPs is evaluated by the degradation of methylene blue (MB) dye under sunlight irradiation. Superior activity is exhibited by Mg0.33Ni0.33Co0.33La0.01Fe1.99O4 NPs. The influence of catalyst dosage, pH, temperature and addition of graphene (Gr) on the photodegradation reaction was studied. Increasing the pH and temperature improved the rate of the photodegradation reaction. The antibacterial and antibiofilm activities of the NPs were assessed against Escherichia coli, Leclercia adecarboxylata, Staphylococcus aureus and Enterococcus faecium. Mg0.33Ni0.33Co0.33Fe2O4 NPs inhibited bacterial growth. They had bacteriostatic activity on all isolates, with a greater effect on Gram-positive bacteria. All tested nano-ferrites had significant antibiofilm activities against some biofilms.

Structural, Magnetic, and Mössbauer Investigation of Mg-Ni-Co ferrites doped by Sm3+ sions

“…This suggests that Sm 3+ ions with a higher ionic radius (0.96 Å) were effectively substituted in the Fe 3+ sites of a lower ionic radius (0.645 Å), following Vegard's law [48]. Similar findings were obtained for Mg-Ni-Co ferrites doped with La 3+ , and Gd 3+ ions, respectively [49,50]. In addition to the spinel ferrites of Ni-Mg-Co, Mg-Cd-Cu, and Ni-Cu-Zn doped with Y 3+ , La 3+ , and Dy 3+ ions, respectively [7,51,52].…”

In situ fabrication of lanthanum-doped nickel oxide nanostructures using sol–gel for the degradation of rhodamine B

“…14 The physical and optical characteristics of doped nanostructures are considerably inuenced by their shape and crystalline structure, which are mainly controlled by the synthesis processes. 14 Consequently, a thorough examination of various synthesis processes for La-NiO nanostructures, such as sol-gel, 15 hydrothermal, 15 and co-precipitation, 16 is essential. 17 Each approach offers distinct control over the qualities of the resulting material and may be used for a variety of applications.…”