Study on photocatalytic properties of magnetically separated defective TNTs nanocomposites

In order to take advantage of the magnetic response properties of Fe 3 O 4 and the excellent photocatalytic activity of P 25 , water-soluble divalent iron salts and trivalent iron salts were used as raw materials; Fe 3 O 4 nanoparticles were grown in situ on TiO 2 nanotubes (TNTs) under alkaline hydrothermal conditions to synthesize magnetically separable defect TNTs nanocomposites. The composites were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and other test methods. The morphology, crystal structure and saturation magnetization of the composites were analyzed. The adsorption and photocatalytic properties of magnetic Fe 3 O 4 /TNTs nanocomposites were evaluated by simulating the photocatalytic adsorption and degradation of tetracycline hydrochloride (TC) by magnetic Fe 3 O 4 /TNTs nanocomposites under sunlight. The results show that the magnetic separation of Fe 3 O 4 /TNTs nanocomposites has good magnetism, and the saturation magnetization is 22.60 emu/g, which can realize the separation and recovery of the composites. The removal rate of tetracycline hydrochloride by magnetic Fe 3 O 4 /TNTs nanocomposite was 90.96 % when the illumination was 90 mins. The prepared magnetically separable defect TNTs nanocomposites have excellent adsorption properties, photocatalytic activity and magnetism, photocatalytic activity and magnetic properties, and can be separated and recovered by external magnetic field.