Spectroscopic and magnetic properties of Co0.15Al0.25-xNi0.6+xFe2O4nanocomposites aided by silica for prohibiting pathogenic bacteria during sewage handling

Abstract

CoAlNiFe2O4 nanomagnetic are an important class of nanocomposite oxides that possess high surface area, excellent magnetic features, tunablesize and shape, surface active sites, and the facility with which they can be functionalized. Therefore, Opto-magnetic Co0.15Al0.25-xNi0.6+xFe2O4 (x = 0.0, 0.3, 0.11, 0.25) nanocomposites aided by silica were prepared via citrate/ethylene glycol sol–gel processes and calcined at 650 °C.Concurrently, the increase of Ni+ nanoparticles on the structural, morphological, optical, and magnetic features of the Co0.15Al0.25-xNi0.6+xFe2O4/SiO2 porous magnetic nanocomposites is examined by the XRD, SEM, and FT-IR spectroscopy. Indirect energy gap value, refractive index, optical dielectric constant, and optical electronegativity were estimated. The Coercivities for the magnetic nanocomposites within ∼ 250–350 Oe and saturation of ∼ 30–35 emu/g can be adjusted using the appropriate Ni amount. The obtained results support the nanocomposites in applications for high-performance optoelectronic and opto-magnetic devices. The highest inhibition zone of all tested bacteria for CANFSO was doped with 0.25 Ni NPs; the diameters of the inhibition zone for E.coli O157, Salmonella typhimurium, Staphylococcus aureus, and Bacillus subtilis were 31, 34, 29, and 27 mm around the discs and 34, 36, 31, and 29 mm around the wells, respectively. The effective dosage (300 ppm) of each nanocomposite was injected to disinfect sewage during different retention times (0–60 min). The results confirmed that CANFS-0.25Ni could completely eliminate all bacterial pathogens in the sewage sample.