Cobalt dopping Fe-MIL-88B were successfully synthesized -in solvothermal procedure using DMF as solvent and with/without NaOH. The samples were characterized using SEM, BET and TGA techniques. The partly substitution of Fe by Co does not change the octahedral shape of their parent Fe-MIL-88B. Crystallizations conducted in NaOH medium, however, results in rod like with 2-end octahedral shape crystals. The BET specific surface area is 139cm2/g. The TGA data indicated that the presence of Co resulted in an increase in thermal stability of synthesized samples compared to parent Fe-MIL-88B. The CO2 adsorption isotherms in Fe-MIL-88B-Co samples were measured volumetrically at five temperatures:278K, 288K, 298K, 308K, 318K. The obtained results showed that Fe-MIL-88B-Co is a potential adsorbent with a maximum adsortption capacity of 1.2312 mmol/g (at T= 278K). The sample synthesized in alkali medium exhibited a better adsorbent for CO2 storage.
Keywords
MIL, adsorption, CO2
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Kinetics of cooperative CO2 adsorption in diamine-appended variants of the metal–organic framework Mg2(dobpdc)
