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Achieving Sub-ppm Sensitivity in SO2 Detection with a Chemically Stable Covalent Organic Framework.

Wei Zhao1, Juan L Obeso2,3, Valeria B López-Cervantes2

  • 1Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore.

Angewandte Chemie (International Ed. in English)
|September 19, 2024
PubMed
Summary

Covalent organic frameworks (COFs) show promise for sulfur dioxide (SO2) detection. SonoCOF-9 exhibits reversible SO2 sorption and strong interactions, enabling selective detection at sub-ppm levels.

Keywords:
SO2 adsorptionSO2 detectionchemical stabilitycovalent organic frameworksfluorescence

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Area of Science:

  • Materials Science
  • Chemistry
  • Environmental Science

Background:

  • Sulfur dioxide (SO2) poses significant environmental and health challenges.
  • Effective detection methods for SO2 are crucial for monitoring and mitigation.
  • Covalent organic frameworks (COFs) offer tunable properties for gas sorption applications.

Purpose of the Study:

  • To investigate the potential of imine-functionalized COFs for SO2 detection.
  • To characterize the SO2 sorption behavior and interaction mechanisms within a COF material.
  • To evaluate the performance of COFs for selective SO2 sensing.

Main Methods:

  • Experimental synthesis and characterization of an imine-functionalized COF (SonoCOF-9).
  • Sorption measurements of SO2 at various pressures and temperatures.
  • Adsorption-desorption cycling to assess reversibility.
  • Isosteric enthalpy of adsorption calculations.
  • Molecular dynamics simulations and Møller-Plesset perturbation theory for interaction analysis.

Main Results:

  • SonoCOF-9 demonstrated reversible SO2 sorption of 3.5 mmol g⁻¹ at 1 bar and 298 K.
  • High reversibility was observed over at least 50 adsorption-desorption cycles at 0.1 bar.
  • The isosteric enthalpy of adsorption (ΔHads) was -42.3 kJ mol⁻¹, indicating strong SO2-COF interaction.
  • Theoretical calculations revealed SO2 interaction with the π-electron system and nitrogen lone pairs of SonoCOF-9.
  • Selective SO2 detection at sub-ppm levels (0.0064 ppm) was achieved.

Conclusions:

  • Imine-functionalized COFs, specifically SonoCOF-9, are effective materials for SO2 detection.
  • The strong and reversible SO2 sorption is attributed to specific interactions within the COF structure.
  • SonoCOF-9 shows significant potential for selective and sensitive SO2 sensing applications.