Developing a sustainable route to environmentally relevant metal–organic frameworks: ultra-rapid synthesis of MFM-300(Al) using microwave heating. Issue 18 (21st August 2019)

• Record Type: Journal Article
• Authors: Thomas-Hillman, Ieuan; Stevens, Lee A.; Lange, Marcus; Möllmer, Jens; Lewis, William; Dodds, Chris; Kingman, Samuel W.; Laybourn, Andrea
• Is Part Of: Green chemistry. Volume 21:Issue 18(2019)
• Page Start: 5039
• Page End: 5045
• Publication Date: 2019-08-21
• Subjects: Environmental chemistry -- Industrial applications -- Periodicals; Environmental management -- Periodicals; 660
• DOI: 10.1039/c9gc02375e
• Languages: English
• ISSNs: 1463-9262

Abstract

Abstract : The synthesis of MFM-300(Al) in aqueous conditions and 10 minutes using microwave heating is reported. The material produced exhibits significantly enhanced uptake of CO2, SO2, and NO2 compared to the 3-day solvothermal route. Abstract : NO2, SO2 and CO2 are major air pollutants causing significant environmental and health problems. Metal–organic frameworks (MOFs), in particular [Al2 (OH)2 (C16 O8 H6 )](H2 O)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 conventionally 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 in 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.