Study on the properties of carbon-based materials adsorbing carbon dioxide
In order to verify the feasibility of coal-based carbon materials as CO2 adsorbent,the adsorption properties of coal-based carbon materials with different surface structures were studied.Taking Lignite as the raw material,CO2 adsorbent was prepared by using steam activation method.The pore and surface structure of the coal-based carbon materials were characterized by nitrogen adsorption-desorption,fully automatic specific surface area and porosity analyzer(BET)and the scanning electron microscopy(SEM).The effect of activation time,amount of adsorbent and pressure on the CO2 adsorption were investigated.And the saturated adsorbent was also regenerated to study its adsorption stability.The results shows that the specific surface area and pore size increased significantly with the increase of activation time.The best adsorptive effect was reached when the activation time is 30 min,the amount of adsorbent is 5 g,and the adsorbent pressure is 0.5 MPa,under which the saturated adsorption capacity is the highest,reaching is 30.11 mL/g.And under the optimal conditions the saturated adsorbent can still reach 29.05 mL/g after being recycled regeneration for 4 times.Coal-based carbon materials can be used for CO2 adsorption,and the research results can provide data support for the modification of coal-based carbon materials,which provide a new idea for the high-value utilization of coal resources.
adsorption and ion exchangecarbon-based materialssteam activationCO2 adsorptionregeneration
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