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OA北大核心CSTPCD

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.