Improving hydrostability of ZIF-8 membranes via surface ligand exchange

Huifeng Zhang; Joshua James; Man Zhao; Ying Yao; Yushan Zhang; Baoquan Zhang; Jerry Lin

doi:10.1016/j.memsci.2017.01.065

Improving hydrostability of ZIF-8 membranes via surface ligand exchange

Huifeng Zhang, Joshua James, Man Zhao, Ying Yao, Yushan Zhang, Baoquan Zhang, Jerry Lin

Research output: Contribution to journal › Article › peer-review

64 Scopus citations

Abstract

Zeolitic imidazolate frameworks (ZIFs) are promising materials for gas and liquid separations due to their unique pore structures and tunable surface properties. Recent studies show that ZIF crystalline powders, especially membranes, are not stable in aqueous solutions. The present work shows the improvement of ZIF-8 crystal and membrane stability in water through utilization of a ligand exchange post-modification method which replaces methylimidazole ligands on the outer surface of ZIF-8 crystals or membranes by the more hydrophobic, bulkier 5,6-dimethylbenzimidazole. Ligand exchange modification does not change the crystal structure, morphology or gas permeance as shown ZIF-8 powder and membrane characterization experiments. The modified ZIF-8 powders and membranes retain identical morphologies and crystallinities after static and dynamic water immersion. The modified ZIF-8 membrane exhibits stable water pervaporation flux controlled by the ZIF-8 layer while the unmodified ZIF-8 membrane experiences dissolution of the ZIF-8 layer during water pervaporation. This ligand exchange strategy enables hydrostable ZIF-8 membranes for practical applications involving aqueous solutions.

Original language	English (US)
Pages (from-to)	1-8
Number of pages	8
Journal	Journal of Membrane Science
Volume	532
DOIs	https://doi.org/10.1016/j.memsci.2017.01.065
State	Published - 2017

Keywords

Improvement
Ligand exchange
Stability
ZIF-8
Zeolitic imidazolate frameworks

ASJC Scopus subject areas

Biochemistry
General Materials Science
Physical and Theoretical Chemistry
Filtration and Separation

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title = "Improving hydrostability of ZIF-8 membranes via surface ligand exchange",

abstract = "Zeolitic imidazolate frameworks (ZIFs) are promising materials for gas and liquid separations due to their unique pore structures and tunable surface properties. Recent studies show that ZIF crystalline powders, especially membranes, are not stable in aqueous solutions. The present work shows the improvement of ZIF-8 crystal and membrane stability in water through utilization of a ligand exchange post-modification method which replaces methylimidazole ligands on the outer surface of ZIF-8 crystals or membranes by the more hydrophobic, bulkier 5,6-dimethylbenzimidazole. Ligand exchange modification does not change the crystal structure, morphology or gas permeance as shown ZIF-8 powder and membrane characterization experiments. The modified ZIF-8 powders and membranes retain identical morphologies and crystallinities after static and dynamic water immersion. The modified ZIF-8 membrane exhibits stable water pervaporation flux controlled by the ZIF-8 layer while the unmodified ZIF-8 membrane experiences dissolution of the ZIF-8 layer during water pervaporation. This ligand exchange strategy enables hydrostable ZIF-8 membranes for practical applications involving aqueous solutions.",

keywords = "Improvement, Ligand exchange, Stability, ZIF-8, Zeolitic imidazolate frameworks",

author = "Huifeng Zhang and Joshua James and Man Zhao and Ying Yao and Yushan Zhang and Baoquan Zhang and Jerry Lin",

note = "Funding Information: The authors would like to acknowledge the financial support from National Natural Science Foundation of China (No. 21276055), National Science Foundation of the United States (CBET-1511005), National Natural Science Youth Foundation of China (No. 21606059) and Marine Public Welfare Industry Research Project (201505006-3). Huifeng Zhang acknowledges useful discussion with Dr. Xueliang Dong in preparation of this manuscript. Publisher Copyright: {\textcopyright} 2017",

year = "2017",

doi = "10.1016/j.memsci.2017.01.065",

language = "English (US)",

volume = "532",

pages = "1--8",

journal = "Journal of Membrane Science",

issn = "0376-7388",

publisher = "Elsevier",

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TY - JOUR

T1 - Improving hydrostability of ZIF-8 membranes via surface ligand exchange

AU - Zhang, Huifeng

AU - James, Joshua

AU - Zhao, Man

AU - Yao, Ying

AU - Zhang, Yushan

AU - Zhang, Baoquan

AU - Lin, Jerry

N1 - Funding Information: The authors would like to acknowledge the financial support from National Natural Science Foundation of China (No. 21276055), National Science Foundation of the United States (CBET-1511005), National Natural Science Youth Foundation of China (No. 21606059) and Marine Public Welfare Industry Research Project (201505006-3). Huifeng Zhang acknowledges useful discussion with Dr. Xueliang Dong in preparation of this manuscript. Publisher Copyright: © 2017

PY - 2017

Y1 - 2017

N2 - Zeolitic imidazolate frameworks (ZIFs) are promising materials for gas and liquid separations due to their unique pore structures and tunable surface properties. Recent studies show that ZIF crystalline powders, especially membranes, are not stable in aqueous solutions. The present work shows the improvement of ZIF-8 crystal and membrane stability in water through utilization of a ligand exchange post-modification method which replaces methylimidazole ligands on the outer surface of ZIF-8 crystals or membranes by the more hydrophobic, bulkier 5,6-dimethylbenzimidazole. Ligand exchange modification does not change the crystal structure, morphology or gas permeance as shown ZIF-8 powder and membrane characterization experiments. The modified ZIF-8 powders and membranes retain identical morphologies and crystallinities after static and dynamic water immersion. The modified ZIF-8 membrane exhibits stable water pervaporation flux controlled by the ZIF-8 layer while the unmodified ZIF-8 membrane experiences dissolution of the ZIF-8 layer during water pervaporation. This ligand exchange strategy enables hydrostable ZIF-8 membranes for practical applications involving aqueous solutions.

AB - Zeolitic imidazolate frameworks (ZIFs) are promising materials for gas and liquid separations due to their unique pore structures and tunable surface properties. Recent studies show that ZIF crystalline powders, especially membranes, are not stable in aqueous solutions. The present work shows the improvement of ZIF-8 crystal and membrane stability in water through utilization of a ligand exchange post-modification method which replaces methylimidazole ligands on the outer surface of ZIF-8 crystals or membranes by the more hydrophobic, bulkier 5,6-dimethylbenzimidazole. Ligand exchange modification does not change the crystal structure, morphology or gas permeance as shown ZIF-8 powder and membrane characterization experiments. The modified ZIF-8 powders and membranes retain identical morphologies and crystallinities after static and dynamic water immersion. The modified ZIF-8 membrane exhibits stable water pervaporation flux controlled by the ZIF-8 layer while the unmodified ZIF-8 membrane experiences dissolution of the ZIF-8 layer during water pervaporation. This ligand exchange strategy enables hydrostable ZIF-8 membranes for practical applications involving aqueous solutions.

KW - Improvement

KW - Ligand exchange

KW - Stability

KW - ZIF-8

KW - Zeolitic imidazolate frameworks

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JO - Journal of Membrane Science

JF - Journal of Membrane Science

ER -

Improving hydrostability of ZIF-8 membranes via surface ligand exchange

Abstract

Keywords

ASJC Scopus subject areas

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