The invention discloses a method for preparing
nitrogen-
doped carbon adsorbents for adsorbing CO2. The method is characterized by including treating fast-growing poplar
bark,
nitrogen-containing compounds and pure water under high-temperature and high-pressure hydrothermal conditions and then carrying out centrifuging and separating to obtain dark brown
solid products; washing the dark brown
solid products by the aid of
distilled water and absolute ethyl
alcohol by several times until filtrate is clear;
drying the filtrate at the temperatures of 80 DEG C and then carrying out calcining at the high temperatures under the protection of
nitrogen to obtain the nitrogen-
doped carbon adsorbents with developed micropore structures. The fast-growing poplar
bark is used as a
raw material, the nitrogen-containing compounds are used as nitrogen sources, and the pure water is used as a
solvent. The method has the main advantages that the nitrogen-
doped carbon adsorbents are high in gaseous CO2 adsorption capacity; the
bark which is
forestry waste is used as the
raw material, is
environmentally friendly, is low in cost and is easily available, the water is used as the
solvent, the nitrogen-containing compounds are used as the nitrogen sources, calcining is carried out at the high temperatures under the protection of
inert gas, accordingly, the nitrogen-doped carbon adsorbents with large specific surface areas and the developed micropore structures can be obtained, and the method is favorable for CO2 gas adsorption effects; hydrothermal preparation conditions,
doping ratios of the nitrogen sources and high-temperature
carbonization parameters can be regulated and controlled, accordingly, the surface functional
group composition and the pore size distribution of the prepared nitrogen-doped carbon adsorbents can be controlled, and the nitrogen-doped carbon adsorbents with the excellent adsorption performance can be obtained;
hydrothermal reaction operation procedures are simple, the method is low in cost, the micropore structures are developed and are controllable, and excellent adsorption effects can be realized.