Preparation And Application Of Nitrogen-Containing Porous Carbon Materials Based On Conductive Polymers

Significant emission of greenhouse gases has caused global warming,thus leading to severe weather events such as tsunamis,drought,and floods.Carbon dioxide is a main greenhouse gas,and the increase of carbon dioxide concentration in the atmosphere is powerfully influencing the global climate.In recent years,how to find an effective way to capture carbon dioxide is the issue that researchers urge to resolve.Furthermore,carbon dioxide as an impurity gas largely reduces the combustion heat of natural gas and destroys gas pipelines such as corroding and clogging pipes.Therefore,how to effectively capture and separate carbon dioxide from natural gas has become an extremely important issue.The absorption of carbon dioxide through liquid amines and ammonia is the most common method of carbon dioxide capture technology.However,due to intensive energy consuming and the corrosivity in the regeneration process,the development of new materials for carbon dioxide selective adsorption and capture is very urgent.In this paper,the conductive polymers were used as carbon and nitrogen sources,including polypyrrole sphere,polypyrrole wire,polypyrrole ribbon and polyaniline.The porous carbon materials were prepared by physical activation method.The effect of material morphology and activation time on the activation and CO2 uptake was further studied.X-Ray diffraction（XRD）,scanning electron microscopy（SEM）,Raman spectroscopy（RAMAN）,transmission electron microscopy（TEM）,X-ray photoelectron spectroscopy（XPS）and elemental analysis（EA）were used to investigated the morphology and surface chemical properties of the prepared carbon materials.The porosity of the materials was measured by nitrogen adsorption anddesorption tests.The adsorption properties of the materials,such as carbon dioxide and methane,were also tested.In this paper,carbon materials were prepared by physical activation using polypyrrole as the carbon source and nitrogen source.The effect of polypyrrole morphology and activation time on the yield,specific surface area and the adsorption capacity of carbon dioxide were studied.The yield decreased,the specific surface area increased,and the adsorption amount of carbon dioxide increased with the prolongation of the activation time.The maximum specific surface area of polypyrrole sphere,polypyrrole wire,polypyrrole ribbon were 561 m²g^-1,960 m²g^-1,1830 m²g^-1,respectively;and the adsorption capacity of carbon dioxide reached 7.3 wt%,8.5 wt %,11.1 wt % respectively at 273 K and 1.0 bar.Compared with polypyrrole sphere and polypyrrole wire,polypyrrole ribbon was more easily activated and the amount of carbon dioxide adsorbed is higher.Finally,polyaniline was chosen as the carbon source and nitrogen source.The effect of activation time on yield,specific surface area and carbon dioxide adsorption capacity was studied.The maximum specific surface area of polyaniline was 2900 m²g^-1,and the adsorption capacity of carbon dioxide could reach to 22.7 wt% at 273 K and 1.0 bar,and the methane adsorption capacity could to 3.3 wt% at 273 K and 1.0 bar.In this paper,the physical activation of conductive polymers with different morphologies and types were studied.The prepared porous carbon materials have high specific surface area and excellent gas adsorption properties,which have potential value in the field of gas adsorption storage and energy.This paper also provides a new approach for the preparation of porous carbon materials.