p-Sulfonated calix[4]arene (SCA) as a bowl-shaped supramolecule with intrinsic cavity1, was incorporated into the pores of MIL-101(Cr) as a micro-mesoporous material through adsorptive loading technique2. The utilizing the pore-partitioning of the MIL-101 (Cr) by SCA which possess the SO3H and OH polar groups led to the SCA@MIL-101 (Cr) composite. The various measurements were used to investigate the success preparation of SCA@MIL-101 (Cr) such as FT-IR, PXRD, TGA, FE-SEM, EDS/MAPP, BET, and TEM analysis. The introduced organic-inorganic composite showed high affinity to gas uptake than neat MIL-101 (Cr) without any involvement of amino functional groups3. By adding a specified amount of SCA into the pores of MIL-101 (Cr), only trace amounts of SCA leached out, demonstrating the compatibility and close match between the size of SCA and the pores in MIL-101 (Cr).Though the prepared SCA@MIL-101 (Cr) composite showed lower BET surface area (SBET < 1100 cm3 g-1) than MIL-101 (Cr) (SBET > 2700 cm3 g-1), the composite was found to be more sensitive to CO2 than the neat MOF. The CO2 uptake values for SCA@MIL-101 (Cr) and MOF were reported to be 100 m2 g-1 and 62 m2 g-1, respectively at 273K and 1 bar. Furthermore, the IAST selectivity results showed an increase for a 25:75 (v:v) molar CO2/N2 mixture from 5.6 (for MOF) to 23 (for composite) at 273K and 1 bar4. The results indicated that the prepared SCA@MIL-101 (Cr) composite could serve as a promising sorbent for greenhouse gases, such as methane and carbon dioxide.
