高性能铝基固态胺吸附剂的制备及其对CO_(2)的吸附  

Preparation and CO_(2) adsorption of high-performance aluminum-based solid amine adsorbent

作　　者：沈雪华 李春艳 曲凡 陈黑锦 颜枫 张作泰 SHEN Xuehua;LI Chunyan;QU Fan;CHEN Heijin;YAN Feng;ZHANG Zuotai(School of Environment,Harbin Institute of Technology,Harbin 150090,China;School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China)

机构地区：[1]哈尔滨工业大学环境学院,哈尔滨150090 [2]南方科技大学环境科学与工程学院,深圳518055

出　　处：《环境工程学报》2022年第4期1256-1264,共9页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(22008104);国家重点研发计划项目(2018YFC1902904);广东省基础与应用基础研究基金项目(2021A1515010148);深圳市技术攻关重点项目(JSGG20210713091810035)。

摘　　要：以铝酸钠和硫酸铝为原料,通过共沸蒸馏合成大孔体积Al_(2)O_(3),并以此作为载体浸渍聚乙烯亚胺(PEI)制备铝基固态胺吸附剂,再系统研究了其对CO_(2)的吸附性能及循环稳定性。通过老化、共沸蒸馏等工艺,在最佳工艺参数下制得孔体积为2.75 cm^(3)·g^(−1)的多孔Al_(2)O_(3)载体,进而制备得到优等级吸附剂(60%PEI@Al_(2)O_(3)-4 h),其对CO_(2)的饱和吸附能力可达到194 mg·g^(−1)。该吸附剂在惰性解吸气氛和CO_(2)解吸气氛下均具有稳定的循环性能,10次循环后其对CO_(2)的吸附量依然为186 mg·g^(−1)和148 mg·g^(−1),分别衰减不到1%和15.2%。本研究结果可为开发低成本、高稳定性固态胺吸附剂提供参考。The porous Al_(2)O_(3)with large-pore volume was synthesized by azeotropic distillation with sodium aluminate and aluminum sulfate as raw materials,which was used as a support to impregnate polyethyleneimine(PEI)for preparing aluminum-based solid amine adsorbent.The CO_(2)adsorption performance and cyclic stability of the adsorbent were systematically investigated subsequently.The porous Al_(2)O_(3)supports with apore volume of 2.75 cm^(3)·g^(−1)were prepared by aging and azeotropic distillation processes under the optimal technological parameters,and then the superior grade adsorbent(60%PEI@Al_(2)O_(3)-4 h)with a saturation CO_(2)adsorption capacity of 194 mg·g^(−1)was prepared.In addition,the adsorbent had stable cyclic performance in inert desorption atmosphere and CO_(2)desorption atmosphere.After 10 cycles,the CO_(2)adsorption capacity of 60%PEI@Al_(2)O_(3)-4 h still retained 186 mg·g^(−1)and 148 mg·g^(−1),with attenuation of less than 1%and 15.2%,respectively.This study can provide reference for developing low-cost and high-stability solid amine adsorbents.

关 键 词：多孔Al_(2)O_(3)载体 固态胺吸附剂 共沸蒸馏 CO_(2)吸附性能 循环稳定性 

分 类 号：X701[环境科学与工程—环境工程]