TY - JOUR

T1 - Facile Fabrication of a Continuous ZIF-67 Membrane for Efficient Azeotropic Organic Solvent Mixture Separation

AU - Sun, Hao

AU - Wang, Fengkai

AU - Li, Xiaoting

AU - Caro, Jürgen

AU - Meng, Hong

AU - Wang, Naixin

AU - An, Quan Fu

N1 - Funding Information: We gratefully acknowledge the funding from the Natural Science Foundation of China (22178008, 22125801).

PY - 2023/3/26

Y1 - 2023/3/26

N2 - Azeotropic organic solvent mixture separation is common in the chemical industry but extremely difficult. Zeolitic imidazolate framework-67 (ZIF-67) shows great potential in organic solvent mixture separation due to its rigid micropores and excellent stability. However, due to the fast nucleation rate, it is a great challenge to prepare continuous ZIF-67 membrane layers with ultrathin thickness. In this study, a hydroxy salt layer with high inducible activity was synthesized as a precursor on different porous substrates to prepare ZIF-67 membranes at room temperature. The precursor layer enables an intact ZIF-67 membrane with an ultrathin thickness of 176±12 nm. The experimental and simulation results confirmed that the size sieving through the pore windows and the preferential adsorption of polar solvent molecules provide the ZIF-67 membrane an unprecedented separation performance such as high separation factors and fluxes, for four types of azeotropic organic solvent mixtures.

AB - Azeotropic organic solvent mixture separation is common in the chemical industry but extremely difficult. Zeolitic imidazolate framework-67 (ZIF-67) shows great potential in organic solvent mixture separation due to its rigid micropores and excellent stability. However, due to the fast nucleation rate, it is a great challenge to prepare continuous ZIF-67 membrane layers with ultrathin thickness. In this study, a hydroxy salt layer with high inducible activity was synthesized as a precursor on different porous substrates to prepare ZIF-67 membranes at room temperature. The precursor layer enables an intact ZIF-67 membrane with an ultrathin thickness of 176±12 nm. The experimental and simulation results confirmed that the size sieving through the pore windows and the preferential adsorption of polar solvent molecules provide the ZIF-67 membrane an unprecedented separation performance such as high separation factors and fluxes, for four types of azeotropic organic solvent mixtures.

KW - Azeotropic Organic Mixtures

KW - Hydroxy Salt

KW - Membrane Separation

KW - Metal–Organic Frameworks (MOFs)

UR - http://www.scopus.com/inward/record.url?scp=85149318946&partnerID=8YFLogxK

U2 - 10.1002/anie.202300262

DO - 10.1002/anie.202300262

M3 - Article

AN - SCOPUS:85149318946

VL - 62

JO - Angewandte Chemie - International Edition

JF - Angewandte Chemie - International Edition

SN - 1433-7851

IS - 15

M1 - e202300262

ER -