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Acta Chimica Sinica >

2020 , Vol. 78 >Issue 3: 250 - 255

DOI: https://doi.org/10.6023/A19120449

Article

O2/N2 Separation Performance of MIL-101(Cr)/Graphene Oxide

  • Liu Yang ,
  • Xia Xiaoxiao ,
  • Tan Yuanyuan ,
  • Li Song
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  • a State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074;
    b China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan 430074

Received date: 2019-12-26

  Online published: 2020-02-24

Supported by

Project supported by the National Natural Science Foundation of China (No. 51672097) and the Double First-class Research Funding of China-EU Institute for Clean and Renewable Energy (No. ICARE-RP-2018-HYDRO-001).

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Abstract

The pressure-swing adsorption (PSA) technology is the promising approach for O2/N2 separation because of its low cost and facile manipulation, in which adsorbents dominate the separation performance. In recent years, metal-organic frameworks (MOFs) have been recognized as the most potential adsorbents in gas adsorption and separation due to their ultrahigh surface area. In this work, MIL-101(Cr) with different weight percentages of graphene oxide (5%, 15% and 35%) was prepared by growing MIL-101(Cr) on pre-synthesized GO materials. The final product was activated under vacuum at 180℃ for 12 h. Structure characterization of different MIL-101(Cr)/GO composites revealed that MIL-101(Cr)/GO-15 with 15% GO additive exhibited the highest specific surface area (3486 m2·g-1) and pore volume (2.39 cm3·g-1) compared with pristine MIL-101(Cr) and the composites with 5% and 35% GO additives. The high surface area and pore volume are beneficial for the O2 uptake of MIL-101(Cr)/GO-15. Compared with the O2 uptake of MIL-101(Cr)/GO-5 (0.35 mmol·g-1) and MIL-101(Cr)/GO-35 (0.31 mmol·g-1), MIL-101(Cr)/GO-15 exhibited the highest uptake of 0.54 mmol·g-1. Further pore size distribution analysis demonstrated that the enhanced O2 uptake of MIL-101(Cr)/GO-15 can be ascribed to its increased fraction of mesopores. On the other hand, O2/N2 selectivity of different MIL-101(Cr)/GO composites was also calculated according to ideal adsorbed solution theory (IAST), from which it was found that MIL-101(Cr)/GO-15 displayed the highest O2/N2 selectivity (1.2) in a binary gas mixture with the volume fraction of O2/N2=1/4. Compared with pristine MIL-101, O2/N2 selectivity of MIL-101(Cr)/GO-15 was increased by 17.65%. Recyclability is one of the most important criteria to evaluate the gas adsorption performance of adsorbents. Therefore, the recyclability of MIL-101(Cr)/GO-15 was tested by measuring the O2 adsorption and desorption isotherms for three cycles. It was revealed that 80% of O2 uptake of MIL-101(Cr)/GO-15 was remained after three adsorp-tion/desorption cycles, implicating the outstanding recyclability of MIL-101(Cr)/GO-15.

Key words： O2/N2 separation; metal-organic framework; MIL-101(Cr)/GO; recyclability

Cite this article

Liu Yang , Xia Xiaoxiao , Tan Yuanyuan , Li Song . O2/N2 Separation Performance of MIL-101(Cr)/Graphene Oxide[J]. Acta Chimica Sinica, 2020 , 78(3) : 250 -255 . DOI: 10.6023/A19120449

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