The intrinsic properties of titanium dioxide could be modified by fluorine doping into crystal lattice, including the photocurrent charge carrier immigration property, the specific surface area, the channel structure, the surface acidity, and others. These changes could influence the recombination of photoinduced electron-hole pairs and the absorption of the parent compound, and thus greatly improve the photocatalysis activity of titanium dioxide, especiallly, under irradiation of ultraviolet light. Although fluorine doping of titanium dioxide was prepared in the laboratory scale, some factors may influence the nano-particle's crystal structure and surface properties, such as the preparation method, the annealing temperature, the precursors, the stoichiometric equivalent, etc. Under these influences, the nanometer photocatalyzer may show different photocatalysis activities, which would be embodied in the rutile phase transformation, the formation of Ti3+, the increase of quantum yield, the change of absorbability (such as surface polarity), and so forth. Thus the photocatalysis efficiency depends strongly on the methods of fluorine doping , the dosage level and the light source. This paper presents a general review of preparation and photocatalysis activity of fluorine doped titanium dioxide with respect to catalyst preparation; phase transformation process and the mineralization of parent compounds.
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