Nano titanium dioxide-biochar composite material as well as preparation method and application thereof

According to the nanometer titanium dioxide-biochar composite material and the preparation method and application thereof, the nanometer titanium dioxide and biomass are subjected to synchronous pyrolysis to obtain the nanometer titanium dioxide-biochar composite material, nanometer titanium dioxide particles are loaded on the surface of biochar, agglomeration of the nanometer titanium dioxide in the using process is avoided, and the utilization rate of the nanometer titanium dioxide is increased. Effective adsorption points of the nano titanium dioxide on pollutants (As) are reduced, so that the adsorption effect of the nano titanium dioxide is not influenced. Moreover, the existence of nano titanium dioxide effectively changes the electrical characteristics of the surface of the biochar, increases the specific surface area of the biochar, and increases the number of active functional groups on the surface of the biochar, so that the removal efficiency of the composite material on pollutants is integrally im