One pot microwave synthesis of MCM-41/Cu based MOF composite with improved CO2 adsorption and selectivity

• New composite materials have been synthesized based on MCM-41 and Cu(BDC) MOF.
• Synthesized composites were studied for selective adsorption of CO2 over CH4.
• Composites were synthesized in one pot method by using microwave radiation.
• The studies proved composite durability for physical adsorption of CO2.
• The composite demonstrated an improved CO2/CH4 selectivity about 30% than MCM-41.

The MCM-41@ Cu(BDC) composite material was synthesized via a facile and fast microwave method. MCM-41 was used as matrix which composed by Cu(BDC) MOF. The effect of molar ratio of the metal salt to MCM-41 substrate was investigated. The synthesized composites were characterized by means of FTIR analysis, X-ray diffraction (XRD), Scanning electron microscopy (SEM), Thermogravimetric analysis (TGA), N2 adsorption-desorption isotherms and Transmission electron microscopy (TEM). The adsorption capacities of the samples were measured by a volumetric method at ambient temperature and the pressure range of 1–25 bar. The composite material with molar ratio of 1:8 (metal ion: MCM-41) demonstrated a 30% increase in CO2/CH4 selectivity and 20% increase in adsorption capacity compared to MCM-41. The stability investigation of the composite in consecutive adsorption-desorption cycles showed no significant loss in adsorption capacity.

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