4.6 Article

Impregnation of 1-n-Butyl-3-methylimidazolium Dicyanide [BMIM][DCA] into ZIF-8 as a Versatile Sorbent for Efficient and Selective Separation of CO2

Journal

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 61, Issue 1, Pages 706-715

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.1c03798

Keywords

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Funding

  1. National Key R&D Program of China [2020YFA0710200]
  2. Science Fund for Creative Research Groups of the National Natural Science Foundation of China [21921005]
  3. National Natural Science Foundation of China [21776277, 21838010, 21890764]
  4. CAS Key Technology Talent Program
  5. Major Scientific and Technological Innovation Project of Shandong Province [2019JZZY010518]
  6. CAS-TWAS

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The study enhanced the CO2/CH4 selectivity performance of zeolitic imidazolate framework (ZIF-8) by impregnating 1-n-butyl-3-methylimidazolium dicyanide [BMIM][DCA], resulting in higher selectivity results reported. The research suggested that IL-impregnated ZIF-8 composite has the potential to address environmental challenges with its improved acid gas separation performance.
The efficient capture of carbon dioxide (CO2) has industrial, economic, and environmental significance. Here, CO2 capture performance in terms of CO2/CH4 selectivity for the zeolitic imidazolate framework (ZIF-8) is enhanced by impregnation of 1-n-butyl-3-methylimidazolium dicyanide [BMIM][DCA]. The preparation of ionic liquids (ILs)/ZIF-8 composites, their comprehensive characterization, and the impact of IL impregnation are all investigated. The crystal structure and morphology of ZIF-8 remained intact even after the impregnation of ILs, according to X-ray diffraction and scanning electron microscopy studies. The infrared spectroscopy known as Fourier transform infrared spectroscopy determines the interaction between ILs and ZIF-8 in the composite. The isotherm fitting was also performed by dual site Langmuir models, which showed good agreement with the experimental results. The CO2/CH4 selectivity results demonstrated that the ideal selectivity for the IL-impregnated ZIF-8 composite has live times higher selectivity than pristine ZIF-8 at 0.05 bar which is the highest reported selectivity. The normalized selectivity of this type of IL/ZIF-8 composite is also higher. This study suggested that the IL/MOF composite with a tunable structure have a strong potential for enhanced acid gas separation performance to meet the environmental challenges.

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