固胺负载SBA-15的石墨烯改性及其CO2吸附性能

为了提高固胺负载SBA-15的CO₂吸附性能及稳定性，推进其在燃烧后CO₂捕集中的实际应用，采用湿法浸渍制备新型石墨烯掺杂超支链聚合物(HBP)负载SBA-15(G/SBA-15/HBP)固胺负载吸附剂用于CO₂捕集.通过SEM、TEM、N2吸附、XRD、FTIR对吸附剂的微观结构和化学组成进行表征，研究分析HBP负载量、吸附温度和脱附温度对CO₂吸附性能的影响并优化反应条件，探讨石墨烯改性前、后吸附剂的热稳定性和循环性能.结果表明，当HBP负载量达到50%时，G/SBA-15/HBP的CO₂吸附量为1.50 mmol/g，相较传统SBA-15/HBP提升了51.51%.石墨烯掺杂能减少颗粒团聚，有利于气体扩散；增加载体12%比表面积及31%孔隙容积，有利于负载HBP的均匀分散，暴露更多的吸附位点.石墨烯掺杂提升了固胺负载吸附剂的热稳定性，提高了吸附剂的使用寿命及循环稳定性.

Graphene modification in amine-functionalized SBA-15 and its CO2 adsorption capacity

The amine-functionalized sorbent, graphene/SBA-15/hyperbranched polymer (G/SBA-15/HBP), was prepared by wet impregnation method for CO₂ capture, to improve the adsorption capacity and stability of amine-functionalized SBA-15 and promote its practical application for post-combustion CO₂ capture. The microstructure and chemical composition of adsorbents were characterized by SEM, TEM, N₂ adsorption, XRD and FTIR. The effects of HBP mass fraction, adsorption temperature and desorption temperature on CO₂ adsorption performance were analyzed, and the reaction conditions were optimized. The thermal stability and cycle performance of the adsorbents before and after graphene modification were investigated. With the HBP mass fraction of 50%, the CO₂ adsorption capacity of G/SBA-15/HBP was 1.50 mmol/g, increasing by 51.51% as compared to that of conventional SBA-15/HBP. Graphene-doping decreased particle agglomeration and facilitated gas diffusion. Increasing 12% surface area and 31% pore volume of supports benefited the uniform dispersion of loaded HBP and helped to expose more adsorption sites. Graphene-doping improved the thermal stability of amine-functionalized adsorbents and enhanced its working lifespan and cycle stability.