Adsorption performance of metal-organic framework/carbon aerogel composite adsorbent for CO2 in simulated flue gas
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.
composite adsorbentmetal-organic frameworkcarbon aerogelCO2 adsorptionflue gas
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