Monolithic nitrogen-doped carbon catalytic material with multistage porous structure as well as preparation method and application of monolithic nitrogen-doped carbon catalytic material

The invention discloses an integral catalytic material with a self-supporting multistage porous structure, a 3D printing preparation method and application thereof, and belongs to the technical field of adsorption catalytic materials. A nitrogen-doped carbon hydrogel precursor is used as an ink main body for 3D printing, a multi-stage porous structure model suitable for flowing type wastewater continuous treatment is designed by utilizing three-dimensional modeling software, and then the 3D printing integral nitrogen-doped carbon aerogel is prepared through a 3D printing technology of direct ink writing. The material has a self-supporting millimeter-micron-nanometer multi-stage porous structure, the specific surface area and the utilization efficiency of active sites can be improved, the mass transfer process is optimized, and circulation of water and adsorption of organic pollutants and bacteria are facilitated. The monolithic aerogel not only has good continuous adsorption and catalysis performance on sewag