Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 620, Issue -, Pages 365-375Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.04.032
Keywords
Zwitterionic ionic liquids; Zeolitic imidazolate framework; Hierarchical pores; Two-dimension
Categories
Funding
- National Natural Science Foundation of China [U1810125, 51776133, U1710110]
- Joint Fund of the Yulin University [2021021]
- Dalian National Laboratory for Clean Energy [2021021]
- Key R&D Program of Shanxi Province [201903D121031]
- Natural Science Foundation of Shanxi Province [201901D111082]
- Shanxi Scholarship Council of China [HGKY2019028]
- Natural Sciences and Engineering Research Council (NSERC)
- Canada Research Chairs Program
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This study proposes a facile ionic liquid-modulation approach for constructing two-dimensional hierarchically porous zeolitic imidazolate frameworks (H-ZIFs) nanosheets with tunable thickness. By tuning the anions of the ionic liquid, the structure, thickness, and pores of the nanosheets can be controlled. This strategy offers a facile approach for designing and constructing multifunctional materials with hierarchical pores.
Hypothesis: Two-dimensional hierarchically porous zeolitic imidazolate frameworks (H-ZIFs) show great promising applications in catalysis, gas separation, energy storage and sensing. Herein, a facile ionic liquid-modulation approach is proposed for constructing H-ZIFs nanosheets with tunable thickness. Experiments: Sulfo-functionalized zwitterionic ionic liquids (SFIL) have been designed as monodentate ligands to direct the formation of microporous nanosheets (ZIF-SFIL) in aqueous solution. Anions of SFIL have been tuned to modulate the coordination environment, enabling the control of the structure, thickness and pores of the nanosheets. Findings: SFIL is demonstrated to pre-coordinate with Zn(II) to induce micropores with high specific surface areas (up to 1176 m(2).g (1)) and accelerate the nucleation of crystals. The BF4 anion serves as a competitive ligand to partially replace SFIL to cause structural defects, thus yielding hierarchically porous ZIFSFIL nanosheets with high specific surface areas (270-466 m(2).g(-1)) and variable thicknesses (from ca. 58 nm to ca. 455 nm). Benefiting from the versatile designability and multifunctionality of ionic liquids, the strategy in this work offers a facile approach for designing and constructing multifunctional materials with hierarchical pores. (c) 2022 Elsevier Inc. All rights reserved.
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