Tin-niobium co-doped titanium dioxide photocatalyst and preparation method and application thereof

The invention discloses a preparation method of a tin-niobium co-doped titanium dioxide photocatalyst. The preparation method comprises the following steps: uniformly mixing and stirring weighed tetrabutyl titanate, tin chloride pentahydrate and niobium chloride pentahydrate in a beaker to obtain a solution A, adding a certain amount of glacial acetic acid into the solution A, and uniformly stirring and mixing to obtain a solution B; and transferring the solution B into a hydrothermal reaction kettle, carrying out hydrothermal reaction at 220 DEG C for 12 hours, cooling the reaction kettle toroom temperature after the reaction is finished, and finally centrifuging, washing and drying to obtain the tin-niobium co-doped titanium dioxide photocatalyst. The method for preparing the SnNb/TiO2photocatalyst is simple, mild in reaction condition and suitable for large-scale synthesis; the catalyst material is used for photocatalytic degradation of low-concentration VOCs gas-toluene, acetoneand mixtures thereof, the c