Hollow tin dioxide@ titanium dioxide/graphene aerogel composite material and preparation method thereof

The invention relates to a hollow SnO2@TiO2/graphene aerogel composite material and a preparation method thereof; the preparation method comprises the following steps of (1) firstly, preparing size-adjustable SiO2 spheres, and taking the SiO2 spheres with the appropriate sizes as a hard template, and hydrothermal treatment is carried out by taking Na2SnO3.3H2O as the raw material to obtain a SiO2@SnO2 composite material with adjustable size and shell thickness, and SiO2 is etched in an NaOH solution to obtain hollow SnO2 spheres; (2) tetrabutyl titanate which is used as a titanium source, andSnO2 hollow spheres are subjected to a sol-gel reaction to prepare hollow SnO2@TiO2 spheres; and (3) hydrothermal treatment and freeze drying are carried out to obtain the SnO2@TiO2/graphene aerogelcomposite material. The preparation process is easy to operate, and the reaction conditions are mild, and the prepared aerogel composite material can play the characteristics of all components in theaerogel composite material,