金属有机骨架/碳气凝胶复合吸附剂对模拟烟气中CO_(2)的吸附性能  

Adsorption performance of metal-organic framework/carbon aerogel composite adsorbent for CO_(2) in simulated flue gas

作　　者：张家伟 左莉莉 王淇 徐怡翎 夏凯 孙德帅[1] ZHANG Jiawei;ZUO Lili;WANG Qi;XU Yiling;XIA Kai;SUN Deshuai(School of Chemistry and Chemical Engineering,Qingdao University,Qingdao 266071,Shandong,China;School of Teacher Education,Weifang Engineering Vocational College,Weifang 262500,Shandong,China)

机构地区：[1]青岛大学化学化工学院,山东青岛266071 [2]潍坊工程职业学院教师教育学院,山东潍坊262500

出　　处：《低碳化学与化工》2024年第7期55-61,共7页Low-Carbon Chemistry and Chemical Engineering

基　　金：山东省科技型中小企业创新能力提升工程(2021TSGC1360)。

摘　　要：金属有机骨架是重要的CO_(2)吸附材料。为提升吸附剂的CO_(2)吸附性能,改善吸附剂的耐水稳定性,将金属有机骨架与碳气凝胶复合形成复合吸附剂,用于模拟烟气中CO_(2)的分离研究。以海藻酸钠/κ型卡拉胶/壳聚糖混合物为前驱体,通过湿法纺丝技术制备了碳气凝胶;在碳气凝胶表面,以天冬氨酸为有机配体,铜为金属中心,通过共沉淀方式制备了复合吸附剂(AspCu-CCA)。通过傅里叶变换红外光谱、X射线光电子能谱和扫描电子显微镜等方法对吸附剂进行了表征,通过循环固定床吸附法考察了复合吸附剂对模拟烟气中CO_(2)的吸附性能。结果表明,AspCu-CCA具有良好的CO_(2)吸附性能和耐水稳定性。在298K、0.1MPa下,AspCu-CCA对纯CO_(2)的饱和吸附量为323mg/g,拟一级动力学速率常数为0.083min^(-1),对体积分数为15%的CO_(2)的饱和吸附量为274 mg/g。烟气中水汽的存在有利于AspCu-CCACO_(2)吸附量的提升,而SO_(2)的存在则会导致AspCu-CCACO_(2)吸附量略有降低。复合吸附剂在20次循环吸附中保持了稳定的CO_(2)吸附量,因此具有良好的烟气CO_(2)分离应用潜力。Metal-organic frameworks are important materials for CO_(2) adsorption.To enhance the CO_(2) adsorption performance and improve the water stability of the adsorbents,a composite adsorbent was formed by combining a metal-organic framework with a carbon aerogel for the separation of CO_(2) in simulated flue gas.The carbon aerogel was prepared using a mixture of sodium alginate/κ-carrageenan/chitosan as a precursor by wet spinning technique.The composite adsorbent(AspCu-CCA)was synthesized on the carbon aerogel as the substrate using aspartic acid as the organic ligand and copper as the metal center by co-precipitation.The adsorbents were characterized by Fourier-transform infrared spectroscopy,X-ray photoelectron spectroscopy and scanning electron microscopy.The CO_(2) adsorption performance of the composite adsorbent in simulated flue gas was investigated by cyclic fixed-bed adsorption method.The results show that AspCu-CCA exhibits excellent CO_(2) adsorption performance and water stability.At 298 K and 0.1 MPa,the saturation adsorption capacity of AspCu-CCA for pure CO_(2) is 323 mg/g,with a pseudo-first-order kinetic rate constant of 0.083 min-1.The saturation adsorption capacity for CO_(2) with volume fraction of 15%is 274 mg/g.The presence of water vapor in the flue gas enhances the CO_(2) adsorption capacity of AspCu-CCA,while the presence of SO_(2) slightly reduces it.The composite adsorbent maintains stable CO_(2) adsorption capacity over 20 cycles of adsorption,indicating its application potential for CO_(2) separation in flue gas.

关 键 词：复合吸附剂 金属有机骨架 碳气凝胶 CO_(2)吸附 烟气 

分 类 号：TQ028[化学工程]