Titanium dioxide/silicon dioxide nanometer composite material and preparation method and application thereof

The invention discloses a titanium dioxide/silicon dioxide nanometer composite material and a preparation method and application thereof. The preparation method comprises the following steps: a, preparing nanometer silica sol by adopting a sol method; b, mixing the nanometer silica sol, hexadecyl trimethyl ammonium bromide and tetrabutyl titanate in the presence of solvents, carrying out contact reaction, so as to prepare a faint yellow precipitate; c, mixing and refluxing the faint yellow precipitate, hydrochloric acid and acetone, so as to prepare white powder; and d, heating the white powder to the temperature of 350-650 DEG C at a temperature rise rate of 1-10 DEG C per minute, carrying out heat treatment for 0.5-24 hours, so as to prepare the titanium dioxide/silicon dioxide nanometer composite material. The nanometer composite material has the functions of nanometer titania, the production cost can be reduced, and the utilization rate is increased, so that the nanometer composite material can be widely applied to photocatalytic degradation organic dyestuffs. Meanwhile, the preparation method is simple in process, and raw materials are readily available.