摘要
To optimize the CO_(2) adsorption performance of carbon materials,this study proposed a preparation method for biomass-based porous carbon through hydrothermal carbonization coupled with nitrogen source optimization and K_(2)CO_(3) activation.The effects of different nitrogen sources(urea,piperazine,melamine,and polyaniline)and activation temperatures on the physicochemical features and CO_(2) adsorption characteristics of the porous carbons were systematically investigated.The results indicated that different nitrogen sources showed varying impacts on the CO_(2) uptake of porous carbons,and not all nitrogen sources enhanced the adsorption performance.The urea and piperazine doped porous carbons exhibited relatively low nitrogen contents and specific surface areas.Whereas the melamine doped carbons showed higher nitrogen contents and specific surface areas,but lacked narrow micropores,limiting their CO_(2) adsorption performance.In contrast,PAC-700,prepared using polyaniline as nitrogen source,featured a well-developed pore structure,abundant narrow micropores and pyrrolic-N groups,endowing it with enhanced CO_(2) adsorption capability.At 0℃/1 bar and 25℃/1 bar,the CO_(2) uptake of PAC-700 reached 6.85 and 4.64 mmol/g,respectively.Additionally,PAC-700 maintained a CO_(2) uptake retention ratio of 99%after 5 adsorption-desorption cycles and exhibited good CO_(2)/N_(2) selectivity of 22.4−51.6.These findings highlighted the advantageous CO_(2) adsorption performance of PAC-700,indicating its substantial application potential in the domain of carbon capture.
本工作开发了一种采用水热氮化耦合K_(2)CO_(3)活化制备杨木屑基多孔炭材料的方法,旨在提升其CO_(2)吸附性能。研究了氮源种类(聚苯胺、尿素、三聚氰胺、哌嗪)和活化温度对多孔炭材料理化特性及CO_(2)吸附性能的影响。结果表明,不同氮源对多孔炭的CO_(2)吸附能力影响有显著差异,并非所有氮源均能有效提升吸附性能。以哌嗪和尿素为氮源所制备的多孔炭,其氮含量和比表面积均较低,而以三聚氰胺为氮源制备的多孔炭,氮含量和比表面积则较高,但其孔结构中窄微孔较少,不利于CO_(2)吸附性能的提升。相比之下,以聚苯胺为氮源制备的多孔炭(PAC-700)具有发达的孔隙结构、丰富的窄微孔和吡咯氮基团,展现出良好的CO_(2)吸附能力。在吸附条件为0、25℃/1 bar时,PAC-700的CO_(2)吸附量分别达到6.85和4.64 mmol/g。此外,PAC-700表现出良好的吸附稳定性,经历五次吸附-解吸循环后CO_(2)吸附量保持率高达99%,且CO_(2)/N_(2)选择性较好。这表明,该多孔炭在碳捕集领域具有良好的应用潜力。
出处
《燃料化学学报(中英文)》
北大核心
2025年第8期1191-1202,共12页
Journal of Fuel Chemistry and Technology
基金
supported by the National Key R&D Program(2022YFC3902403)
Fundamental Research Funds for the Central Universities(2024JC001,2019JG002)
Technology Innovation Special Fund of Jiangsu Province for Carbon Dioxide Emission Peaking and Carbon Neutrality(BE2022307)。
