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MOFs with Open Metal(III) Sites for the Environmental Capture of Polar Volatile Organic Compounds |
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| Authors: | Maria Inês Severino Abeer Al Mohtar Carla Vieira Soares Cátia Freitas Nicolas Sadovnik Shyamapada Nandi Georges Mouchaham Vanessa Pimenta Farid Nouar Marco Daturi Guillaume Maurin Moisés L Pinto Christian Serre |
| Institution: | 1. Institut des Matériaux Poreux de Paris (IMAP), ESPCI Paris, Ecole Normale Supérieure, CNRS, PSL University, 75005 Paris, France
These authors contributed equally to this work.;2. CERENA, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal These authors contributed equally to this work.;3. ICGM, Univ. Montpellier, CNRS, ENSCM, 34293 Montpellier, France These authors contributed equally to this work.;4. CERENA, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal;5. Normandie Univ., ENSICAEN, UNICAEN, CNRS, Laboratoire Catalyse et Spectrochimie, 14000 Caen, France;6. Institut des Matériaux Poreux de Paris (IMAP), ESPCI Paris, Ecole Normale Supérieure, CNRS, PSL University, 75005 Paris, France;7. ICGM, Univ. Montpellier, CNRS, ENSCM, 34293 Montpellier, France |
| Abstract: | Metal–Organic Frameworks (MOFs) with open metal sites (OMS) interact strongly with a range of polar gases/vapors. However, under ambient conditions, their selective adsorption is generally impaired due to a high OMS affinity to water. This led previously to the privilege selection of hydrophobic MOFs for the selective capture/detection of volatile organic compounds (VOCs). Herein, we show that this paradigm is challenged by metal(III) polycarboxylates MOFs, bearing a high concentration of OMS, as MIL-100(Fe), enabling the selective capture of polar VOCs even in the presence of water. With experimental and computational tools, including single-component gravimetric and dynamic mixture adsorption measurements, in situ infrared (IR) spectroscopy and Density Functional Theory calculations we reveal that this adsorption mechanism involves a direct coordination of the VOC on the OMS, associated with an interaction energy that exceeds that of water. Hence, MOFs with OMS are demonstrated to be of interest for air purification purposes. |
| Keywords: | MOFs Volatile Organic Compounds Adsorption Open Metal Sites Acetic Acid |