聚乙烯亚胺修饰的氧化硅纳米管基吸附剂的制备及其CO_2吸附应用  

Preparation of Polyethylenimine-Functionalized Silica Nanotubes and Their Application for CO_2 Adsorption

作　　者：姚蔓莉 董艳艳[1] 谢菁[1] 贾爱平[1] 谢冠群[1] 胡庚申[1] 罗孟飞[1] 

机构地区：[1]浙江师范大学物理化学研究所,先进催化剂材料教育部重点实验室,浙江金华321004

出　　处：《物理化学学报》2014年第4期789-796,共8页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(21203167)资助项目~~

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ESNTs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°C.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3.32 mmol·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3.75 mmol·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.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.

关 键 词：介孔纳米管氧化硅 聚乙烯亚胺 吸附 CO2捕捉 

分 类 号：TQ424[化学工程]