The unique properties of ionic liquids (ILs), such as excellent affinity and sorption capabilities towards volatile organic compounds (VOCs), negligible vapor pressure, and chemical and thermal stabilities, make them promising candidates for targeting VOCs in polluted air. However, their relatively high viscosity and low air partition coefficients limit their direct application. Confining ILs into metal organic frameworks (MOFs) can overcome these drawbacks and presents an innovative alternative to support ionic liquids for efficient VOC capture. Here we synthesize a series of novel composite materials by cladding [BMIM][FeCl<sub>4</sub>] ionic liquid into porous structures of MIL-101(Cr) trhough a post-impregnation method. The results showed that the ionic liquid was successfully confined into MIL-101(Cr) for a favorable VOC capture without damaging framework structure. The optimized composite materials exhibited much higher toluene sorption capacity than commercial activated carbons (AC) and AC fibers by 40-90%, Y-Zeolite by 4 times and pristine MIL-101 (Cr) by 3 times, especially at lower toluene concentrations (P/P<sub>0</sub> &lt; 0.1 at 20°C). Sorption kinetics of toluene was also improved in the presence of ionic liquid, leading to 3.5 times higher sorption rates and toluene diffusion coefficients compared to pristine MIL-101 (Cr). This work demonstrates great potential of IL-MOF composites for VOC treatment.

Ionic liquid - MOF composite materials for VOC capture from polluted air

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.