CoFeO@HaP as Magnetic Heterostructures for Sustainable Wastewater Treatment.

The aim of this study was to synthesize a CoFeO@HaP nanocomposite (HaP-Hydroxyapatite) through the coprecipitation method in aqueous solution, with the purpose of using it in adsorption processes for the removal of Congo Red dye from aqueous solutions. Fourier Transform Infrared Spectroscopy (FT-IR) was used to characterize the synthesized material, identifying absorption bands specific to the functional groups of cobalt ferrite (Fe-O and Co-O at 603 and 472 cm) and hydroxyapatite PO at 1035, 962, 603 and 565 cm. Powder X-ray diffraction confirmed the cubic spinel structure of cobalt ferrite (S.