Supported nano TiO2 catalyst and preparation method thereof

The invention discloses a supported nano TiO2 catalyst and a preparation method of the supported nano TiO2 catalyst. The preparation method comprises the following steps: firstly carrying out certain pretreatment on bacterial cellulose prepared by a dynamic fermentation method, by utilizing rich polyhydroxyl groups and a directionally-distributed water molecule layer on the surface of the bacterial cellulose, enabling the titanium dioxide precursor comprising chlorate, sulfate and organic complex and the like to be directionally hydrolyzed on the surface of the bacterial cellulose by a hydrothermal method, and finally preparing the supported nano TiO2 catalyst by dewatering. The supported nano TiO2 catalyst prepared by the invention has the advantages that the preparation process is simple, the cost is low, the reaction condition is mild, the shape of a product is controllable and the specific surface area is large and the like, and can be widely applied in the fields such as photocatalysis, optical devices and proton exchange membrane fuel cells.