Adsorption of CO2 by L-glutamic acid-modified metal organic framework material MIL-101
L-glutamic acid(L-Glu)was used as a secondary ligand,and MIL-101-x Glu was synthesized via a one-pot method.The effect of different dosages of L-Glu on the crystal growth of MIL-101 was investigated by means of XRD,N2 adsorption-desorption,SEM,and TG.The experimental results show that MIL-101-6%Glu represents an octahedral microstructure with uniform granular particle sizes and preferential growth along the(113)crystal plane,closely matching the theoretically simulated value of MIL-101.The material exhibits a high pore volume of 1.65 cm3/g and a specific surface area of 3 679.51 m2/g and shows excellent N2 adsorption-desorption properties,as well as thermal stability.Gas adsorption tests at 298 K and 5 MPa show that MIL-101-6%Glu has CO2 and CH4 adsorption capacities of 22.94 and 7.10 mmol/g,respectively,with a low N2 adsorption capacity of 3.94 mmol/g,surpassing the performance of pure MIL-101.
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