Construction of OH sites within MIL-101(Cr)-NH2 framework for enhanced CO2 adsorption and CO2/N2 selectivity

다국어 초록 (Multilingual Abstract)

The MIL-101(Cr)-NH2 framework was effectively modified by 2,5-dihydroxyterephthalic acid ((HO)2BDC) guest molecules to obtain (HO)2BDC-incorporated MIL-101(Cr)-NH2 adsorbent, namely (HO)2BDC@CrN. The CO2- temperature programmed-desorption (TPD) analysis indicated that the incorporation of (HO)2BDC into the MIL- 101(Cr)-NH2 framework generated new OH sites besides unsaturated Cr- metal sites and NH2 sites. The formed OH sites improved CO2 adsorption and separation on the prepared adsorbent. The highest CO2 uptake capacity of ~3.58mmol g1 obtained over the novel (HO)2BDC@CrN adsorbent was higher 40% than that of the parent MOF, and also surpasses that of other previously reported adsorbents, including activated carbon, nitrogen-doped hollow carbon, zeolite, ZIF-68, MOF-5, ZIF-8, UiO-66(Zr), and MIL-100(Cr). The highest ideal adsorbed solution theory (IAST) CO2/ N2 selectivity of ~67 was obtained over the (HO)2BDC@CrN adsorbent at 100 kPa. The achieved selectivity was six times greater than that of pure MIL-101(Cr)-NH2. In addition, the synthesized (HO)2BDC@CrN adsorbent displayed good regenerability after six consecutive adsorption-desorption cycles.

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