Preparation method of magnetic-doped titanium dioxide nanotube

The invention discloses a preparation method of a magnetic-doped titanium dioxide nanotube, comprising the following steps: firstly, in glycol electrolyte of ammonium fluoride, taking a ferro-titanium alloy foil as a positive pole and a Pt sheet as a negative pole, and then obtaining a highly-ordered Fe ion-doped TiO2 nanotube by an anodic oxidation method; secondly, placing the Fe ion-doped TiO2nanotube into a reaction kettle containing NaOH concentrated solution for heating treatment so that Fe2O3 in the nanotube is transformed into Fe3O4 with strong magnetic property to obtain the magnetic-doped TiO2 nanotube; and finally, roasting the magnetic-doped TiO2 nanotube and cooling in a medium to obtain the anatase magnetic-doped TiO2 nanotube. By adopting the preparation method, the highly-ordered doped Fe2O3 in the nanotube is transformed into the Fe3O4 with strong magnetic property, thus improving the electronic transmission capability on the surface of the nanotube, and effectively promoting application of TiO2 to the fields of a solar cell, photocatalysis and the like.