Rapid temperature-assisted synthesis of nanoporous γ-cyclodextrin-based metal–organic framework for selective CO2 adsorption

Abstract

We present a rapid and surfactant-free temperature-assisted synthesis route to prepare γ-cyclodextrin-based metal–organic framework (γ-CD-MOF). The cubic crystals of the CD-MOF with an average edge length of 10–15 μm, specific surface area of 775?m² g^?1 and total pore volume of 0.229?cm³ g^?1 were synthesized in much shorter time than conventional CD-MOFs. To show the efficiency of the synthesized CD-MOF as adsorbent of gas, the uptake of CO₂ at different temperature and pressure was investigated. It is shown that the CO₂ uptake increases with increasing pressure and decreasing temperature. Further microgravimetric investigation on gas adsorption at low pressure demonstrated superior gas uptake (ca. 147?mg g^?1) than previous reports. At the maximum equilibrium pressure, the uptake amounts of CO₂ were found to be 326 and 268?mg g^?1 at 303 and 323?K, respectively. The synthesized CD-MOF has great potential to be used in gas storage and separation applications.