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Fabrication of hierarchically porous ZIF-8 using a competitive ligand via a one-step method in supercritical CO2 and its application for CO2 adsorption.

Authors :
Li, Zhen
He, Bo
Tang, Shaokun
Source :
CrystEngComm; 1/7/2024, Vol. 26 Issue 1, p70-79, 10p
Publication Year :
2024

Abstract

Hierarchically porous metal–organic frameworks (HP-MOFs) possess the advantages of the high porosity of MOFs and unique properties, such as a wide pore size range. Hierarchically porous ZIF-8 (HP-ZIF-8) was facilely fabricated via a one-step method in supercritical CO<subscript>2</subscript> (scCO<subscript>2</subscript>) using a competitive ligand. The mesoporous structure and morphology of HP-ZIF-8 can be easily adjusted by changing the dosage of competing ligands and the reaction temperature. When the molar ratio of zinc acetylacetonate, 2-methylimidazole, and 2-butyl-1H-imidazole was 1 : 1 : 6, the HP-ZIF-8 with micropores (1.7 nm) and mesopores (3.9–30 nm) was synthesized at 50 °C and 30 MPa for 3 hours with excellent reproducibility. The as-synthesized ZIF-8 shows a high activity for CO<subscript>2</subscript> adsorption, and the CO<subscript>2</subscript> equilibrium adsorption capacity reached up to 1.49 mmol g<superscript>−1</superscript> sorbent at 25 °C and 0.1 MPa. Moreover, the CO<subscript>2</subscript> equilibrium adsorption capacity of HP-ZIF-8 was maintained at 1.36 mmol g<superscript>−1</superscript> sorbent after 7 cycles. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
14668033
Volume :
26
Issue :
1
Database :
Complementary Index
Journal :
CrystEngComm
Publication Type :
Academic Journal
Accession number :
174293636
Full Text :
https://doi.org/10.1039/d3ce01097j