Synthesizing FeCo-MIL-88B and Investigating Its Potential for CO2 Capture

Abstract

Cobalt doped with Fe-MIL-88B was successfully synthesized in a solvothermal process using DMF as solvent and with/without NaOH. The samples were characterized using SEM, BET and TGA techniques. The partly substitution of Fe with Co does not change the octahedral shape of their parent Fe-MIL-88B. However, crystallization conducted in NaOH medium results in rod-like octahedral crystals. The BET specific surface area is 139cm²/g. The TGA data indicate that the presence of Co resulted in an increase in the thermal stability of the synthesized samples compared to parent Fe-MIL-88B. The CO₂ adsorption isotherms in Fe-MIL-88B-Co samples were volumetrically measured at five different temperatures, namely 278K, 288K, 298K, 308K and 318K. The obtained results show 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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