金属有机骨架/碳气凝胶复合吸附剂对模拟烟气中CO2的吸附性能
Adsorption performance of metal-organic framework/carbon aerogel composite adsorbent for CO2 in simulated flue gas
张家伟 1左莉莉 2王淇 1徐怡翎 1夏凯 1孙德帅1
作者信息
- 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
- 折叠
摘要
金属有机骨架是重要的CO2吸附材料.为提升吸附剂的CO2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CO2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CO2的吸附性能.结果表明,AspCu-CCA具有良好的CO2吸附性能和耐水稳定性.在298 K、0.1 MPa下,AspCu-CCA对纯CO2的饱和吸附量为323 mg/g,拟一级动力学速率常数为0.083 min-1,对体积分数为15%的CO2的饱和吸附量为274 mg/g.烟气中水汽的存在有利于AspCu-CCA CO2吸附量的提升,而SO2的存在则会导致AspCu-CCA CO2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CO2吸附量,因此具有良好的烟气CO2分离应用潜力.
Abstract
Metal-organic frameworks are important materials for CO2 adsorption.To enhance the CO2 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 CO2 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 CO2 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 CO2 adsorption performance and water stability.At 298 K and 0.1 MPa,the saturation adsorption capacity of AspCu-CCA for pure CO2 is 323 mg/g,with a pseudo-first-order kinetic rate constant of 0.083 min-1.The saturation adsorption capacity for CO2 with volume fraction of 15%is 274 mg/g.The presence of water vapor in the flue gas enhances the CO2 adsorption capacity of AspCu-CCA,while the presence of SO2 slightly reduces it.The composite adsorbent maintains stable CO2 adsorption capacity over 20 cycles of adsorption,indicating its application potential for CO2 separation in flue gas.
关键词
复合吸附剂/金属有机骨架/碳气凝胶/CO2吸附/烟气Key words
composite adsorbent/metal-organic framework/carbon aerogel/CO2 adsorption/flue gas引用本文复制引用
基金项目
山东省科技型中小企业创新能力提升工程(2021TSGC1360)
出版年
2024
国家科技期刊平台
NSTL
万方数据