One-step preparation method for iron-and-fluorine-codoped titanium dioxide nanosheet

The invention relates to a one-step preparation method for an iron-and-fluorine-codoped titanium dioxide nanosheet. The preparation method comprises the following steps: dissolving ferric trifluoridein a hydrofluoric acid solution, then adding a certain amount of tetrabutyl titanate solution, allowing tetrabutyl titanate to be hydrolyzed into titanium dioxide under the condition of a high temperature of 200 DEG C and subjecting titanium dioxide to dissolving and re-growing, wherein doping of ferric ions and fluorine ions is completed in the process of growing and the titanium dioxide nanosheet is formed; and washing the titanium dioxide nanosheet with absolute ethyl alcohol and carrying out drying so as to obtain the gray iron-and-fluorine-codoped titanium dioxide nanosheet. According tothe invention, the mass of added ferric trifluoride can be adjusted so as to prepare titanium dioxide nanosheets doped by different iron elements. The one-step preparation method provided by the invention is simple in operatio