Linking defects, hierarchical porosity generation and desalination performance in metal-organic frameworks.
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Authors
Liang, Weibin
Li, Lin
Shepherd, Nicholas D
D'Alessandro, Deanna M
Publication Date
2018-04-14Journal Title
Chem Sci
ISSN
2041-6520
Publisher
Royal Society of Chemistry (RSC)
Volume
9
Issue
14
Pages
3508-3516
Language
eng
Type
Article
Physical Medium
Electronic-eCollection
Metadata
Show full item recordCitation
Liang, W., Li, L., Hou, J., Shepherd, N. D., Bennett, T. D., D'Alessandro, D. M., & Chen, V. (2018). Linking defects, hierarchical porosity generation and desalination performance in metal-organic frameworks.. Chem Sci, 9 (14), 3508-3516. https://doi.org/10.1039/c7sc05175a
Abstract
Composite membranes with defective metal-organic frameworks (MOFs) connect the emerging fields of MOF topological modification, MOF-polymer interfacial engineering and composite material functionalization. Although defective MOFs can be fabricated via thermal or chemical treatment, the relationship between hierarchical MOF structure and their performance in a polymeric membrane matrix has so far not been investigated. Here we show how a modulator fumarate-based MIL-53(Al) microwave synthesis process results in defective MOFs. This ligand replacement process leads to materials with hierarchical porosity, which creates a higher mesopore volume and Brønsted acidity without compromising the crystalline structure and pH stability. Compared with stoichiometric ratios, increasing the reaction time leads to more effective defect generation. The subsequent incorporation of defective MOFs into polyvinyl alcohol pervaporation membranes can effectively promote the fresh water productivity in concentrated brine treatment, with salt rejection of >99.999%. The membranes also have good long-term operational stability with effective antifouling behavior. We provide evidence that topological engineering of the MOF surface is related to their physical and chemical behaviors in a polymeric matrix, opening up the possibility of MOF defect engineering to realize selective separations, catalysis and sensing within a polymeric matrix.
Sponsorship
Royal Society (UF150021)
Identifiers
External DOI: https://doi.org/10.1039/c7sc05175a
This record's URL: https://www.repository.cam.ac.uk/handle/1810/283537
Rights
Attribution-NonCommercial 4.0 International
Licence URL: https://creativecommons.org/licenses/by-nc/4.0/
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