中文摘要：

以P123为模板，1，2-二（三甲氧基硅基）乙烷（BTME）为硅源合成了介孔氧化硅纳米管（E-SNTs）．将E-SNTs经过聚乙烯亚胺（PEI）修饰后制得吸附剂用于捕捉CO2．对吸附剂进行了透射电镜（TEM）、物理吸附、傅里叶变换红外（FTIR）光谱、热重分析（TGA）等表征．E—SNTs—PEI吸附剂的最佳CO2吸附温度为75℃吸附剂的CO2吸附量随着PEI负载量的增加呈现先增大后减小的趋势，其中50％为最佳负载量，此时吸附剂的吸附量最大为3．32mmol·g^-1．相比较SBA-15基吸附剂，E-SNTs基吸附剂具有更优异的吸附性能．在有水汽的存在下，吸附剂E-SNTs-50的CO2吸附量达到3.75mmol·g^-1．经过四次循环吸脱附实验测试E—SNTs—PEI吸附剂的稳定性能，结果表明其CO2吸附量基本不变，该吸附剂表现出较好的稳定性和可再生能力．

英文摘要：

Abstract： Mesoporous ethane-silica nanotubes （E-SNTs） were synthesized using P123 as a template and 1,2-bis（trimethoxysilyl）ethane （BTME） as a silica source. E-SNTs were modified with polyethylenimine （PEI） as sorbents for CO2 adsorption. These new composite sorbents were characterized by transmission electron microscopy （TEM）, nitrogen adsorption/desorption, Fourier transform infrared （FTIR） spectroscopy, and thermal gravimetric analysis （TGA）. We found that 75 ℃ is the optimal temperature for CO2 adsorption. E-SNTs with a 50% （w） PEI loading （E-SNTs-50） exhibited a higher CO2 adsorption capacity （3.32 mmol.g^-1） than the other materials. The E-SNTs-based sorbents show better CO2 capture performance than the SBA-15-based sorbents. Additionally, CO2 uptake was further enhanced to 3.75 mmol. g-1 in the presence of moisture. Cyclic CO2 adsorption-desorption test results indicated that the composite sorbents are stable and can be regenerated.