In situ growth of Ni/N co-doped carbon nanotubes in biochar to improve CO2 capture capacity

Carbon aerogel is limited in its application in CO 2 capture due to its poor surface properties. Heteroatom doping is conducive to the adsorption of CO 2 by biochar. Therefore, by in-situ synthesis of nitrogen-doped carbon nanotubes on BC, Ni/N co-doped cellulose carbon aerogel was synthesized, and the results showed excellent adsorption capacity and reversible adsorption/desorption properties. The synthesis of nitrogen-doped carbon nanotubes made the material realize N doping and provided more adsorption sites for CO 2 adsorption. When Ni is dispersed in the material, it not only increases the carbon dioxide adsorption sites but also enhances the thermal stability and cycling performance of the composite material. Meanwhile, the coordination effect between nickel and nitrogen further enhances the capture capacity of carbon dioxide. Ultimately, the adsorption capacity of the modified biochar reached 4.89 mmol/g, and it also has good recycling performance. The unique co-doping design strategy reduces the dependence of traditional carbon materials on surface area when adsorbing CO 2 , providing a new direction for the modification of carbon materials.