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Developing a sustainable route to environmentally relevant metal-organic frameworks: ultra-rapid synthesis of MFM-300(Al) using microwave heating

Thomas-Hillman, Ieuan; Stevens, Lee Anthony; Lange, Marcus; Möllmer, Jens; Lewis, William; Dodds, Christopher; Kingman, Samuel; Laybourn, Andrea

Authors

Ieuan Thomas-Hillman

Lee Anthony Stevens

Marcus Lange

Jens Möllmer

William Lewis

Christopher Dodds

Samuel Kingman

Andrea Laybourn



Abstract

NO2, SO2 and CO2 are major air pollutants causing significant environmental and health problems. Metal-organic frameworks (MOFs), in particular [Al2(OH)2(C16O8H6)](H2O)6 (trivial names: NOTT-300/MFM-300(Al)), have shown great promise for capturing these gases. However MOF syntheses often involve toxic solvents and long durations which are inherently energy intensive, an environmental burden, and have serious safety risks. There is a pressing need to develop environmentally-friendly routes to MOFs that require less energy and implement safer solvents particularly when considering scale-up beyond the laboratory for industrial application. We report the rapid synthesis of MFM-300(Al) in aqueous conditions and 10 minutes using microwave heating. This is the fastest reported synthesis of MFM-300(Al) to date with a 99.77 % reduction in reaction time compared to the current reported 3-day conventional heated route. The microwave synthesized sub-micron crystalline material exhibits gas uptake capacities of 8.8 mmol g-1 at 273 K and 1.0 bar for CO2, 8.5 mmol g-1 at 298 K and 0.17 bar for SO2, and 1.9 mmol g-1 at 298 K and 0.01 bar for NO2. These are 26 %, 70 %, and 90 % greater for CO2, SO2, and NO2, respectively, when compared to previously reported MFM-300(Al) materials produced via a 3-day conventionally heated route demonstrating the production of high quality materials at a fraction of the time with enhanced gas properties. Crucially, this offers an opportunity to move from batch to continuous processing owing to reduced reaction times underpinned by targeted heating.

Journal Article Type Article
Publication Date Aug 1, 2019
Journal Green Chemistry
Print ISSN 1463-9262
Electronic ISSN 1463-9270
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 21
Issue 18
Pages 5039-5045
APA6 Citation Thomas-Hillman, I., Stevens, L. A., Lange, M., Möllmer, J., Lewis, W., Dodds, C., …Laybourn, A. (2019). Developing a sustainable route to environmentally relevant metal-organic frameworks: ultra-rapid synthesis of MFM-300(Al) using microwave heating. Green Chemistry, 21(18), 5039-5045. https://doi.org/10.1039/c9gc02375e
DOI https://doi.org/10.1039/c9gc02375e
Keywords Pollution; Environmental Chemistry
Publisher URL https://pubs.rsc.org/en/Content/ArticleLanding/2019/GC/C9GC02375E#!divAbstract
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