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Pickering Emulsion-Templated Encapsulation of Ionic Liquids for Contaminant Removal.
ACS Applied Materials & Interfaces 2019 Februrary 12
Ionic liquids (ILs) have received attention for a diverse range of applications, but their liquid nature can make them difficult to handle and process and their high viscosities can lead to sub-optimal performance. As such, encapsulated ILs are attractive for their ease of handling and high surface area, and have potential for improved performance in energy storage, gas uptake, extractions, etc. Herein, we report a method to encapsulate a variety of ILs using Pickering emulsions as templates, graphene oxide (GO)-based nanosheets as particle surfactants, and interfacial polymerization for stabilization. The capsules contain up to 80% IL in the core and the capsule shells are composed of polyurea and GO. We illustrate that capsules can be prepared from IL-in-water or IL-in-oil systems and explore the impact of monomer and IL identity, thereby accessing different compositions. The spherical, discrete capsules are characterized by optical microscopy, scanning electron microscopy, infrared spectroscopy, Raman spectroscopy, thermogravimetric analysis, and 1H NMR spectroscopy. We illustrate the application of these IL capsules as a column material to remove phenol from oil, demonstrating ≥98% phenol removal after passage of >170 column volumes. This facile method to prepare capsules of IL will find widespread use across diverse applications.
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