Achieving Sub‐ppm Sensitivity in SO<sub>2</sub> Detection with a Chemically Stable Covalent Organic Framework
We report the inaugural experimental investigation of covalent organic frameworks (COFs) to address the formidable challenge of SO<sub>2</sub> detection. Specifically, an imine-functionalized COF (SonoCOF-9) demonstrated a modest and reversible SO<sub>2</sub> sorption of 3.5 mmol g<sup>-1</sup> at 1 bar and 298 K. At 0.1 bar (and 298 K), the total SO<sub>2</sub> uptake reached 0.91 mmol g<sup>-1</sup> with excellent reversibility for at least 50 adsorption-desorption cycles. An isosteric enthalpy of adsorption (ΔH<sub>ads</sub>) for SO<sub>2</sub> equaled -42.3 kJ mol<sup>-1</sup>, indicating a relatively strong interaction of SO<sub>2</sub> molecules with the COF material. Also, molecular dynamics simulations and Møller-Plesset perturbation theory calculations showed the interaction of SO<sub>2</sub> with π density of the rings and lone pairs of the N atoms of SonoCOF-9. The combination of experimental data and theoretical calculations corroborated the potential use of this COF for the selective detection and sensing of SO<sub>2</sub> at the sub-ppm level (0.0064 ppm of SO<sub>2</sub>).
Authors
- Juan L. Obeso (ORCID: https://orcid.org/0000-0002-8876-9484)
- Yoarhy A. Amador‐Sánchez (ORCID: https://orcid.org/0000-0002-5107-5358)
- Ricardo A. Peralta (ORCID: https://orcid.org/0000-0001-7573-2968)
- Ilich A. Ibarra (ORCID: https://orcid.org/0000-0002-8573-8033)
- Wei Juan Zhao (ORCID: https://orcid.org/0000-0003-0265-2590)
- Elı́ Sánchez-González (ORCID: https://orcid.org/0000-0002-5440-329X)
- Diego Solís-Ibarra (ORCID: https://orcid.org/0000-0002-2486-0967)
- Junyu Ren (ORCID: https://orcid.org/0000-0002-4308-0093)
- Mounib Bahri (ORCID: https://orcid.org/0000-0002-8336-9158)
- Giovanni Barcaro (ORCID: https://orcid.org/0000-0002-5520-5914)
- Susanna Monti (ORCID: https://orcid.org/0000-0002-3419-7118)
- Nigel D. Browning (ORCID: https://orcid.org/0000-0003-0491-251X)
- Dan Zhao (ORCID: https://orcid.org/0000-0002-4427-2150)
- Valeria B. López‐Cervantes
Institutions
- University of Liverpool (GB)
- National University of Singapore (SG)
- National Academies of Sciences, Engineering, and Medicine (US)
- Universidad Autónoma Metropolitana (MX)
- Institute for the Chemistry of OrganoMetallic Compounds (IT)
- Institute for Chemical and Physical Processes (IT)
- Instituto Politécnico Nacional (MX)
- Universidad Nacional Autónoma de México (MX)
Publication Details
- Journal
- Angewandte Chemie International Edition
- Published
- 2024-09-19
- DOI
- https://doi.org/10.1002/anie.202415088
- Citations
- 16
- Primary Topic
- Gas Sensing Nanomaterials and Sensors
- Type
- article
- Field-Weighted Citation Impact
- 3.34
Funders
- National Research Foundation
- Agency for Science, Technology and Research
- National Research Foundation Singapore
- Energy Market Authority of Singapore
- Ministry of Education, India
- Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México