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Novel porous frameworks efficiently capture CO2 and SO2 emissions. These functionalized covalent triazine-based frameworks (CTF-CSUs) demonstrate high gas adsorption affinity, offering a promising solution for industrial pollution control.

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Area of Science:

  • Materials Science
  • Environmental Science
  • Chemistry

Background:

  • Industrial emissions of CO2 and SO2 pose significant environmental challenges.
  • Development of effective sorbent materials is crucial for mitigating these emissions.

Purpose of the Study:

  • To construct and characterize novel hierarchically porous covalent triazine-based frameworks (CTF-CSUs).
  • To investigate the gas adsorption properties of these frameworks, particularly for CO2 and SO2.
  • To explore the impact of functionalization with carboxylic acid/sodium carboxylate groups on adsorption capacity.

Main Methods:

  • Synthesis of hierarchically porous covalent triazine-based frameworks (CTF-CSUs).
  • Functionalization of CTF-CSUs with carboxylic acid and sodium carboxylate groups.
  • Gas adsorption measurements (CO2 and SO2 uptake) under various conditions.
  • Characterization of pore structure and surface properties.

Main Results:

  • The developed CTF-CSUs exhibit tunable pore structures and high affinity for acid gases.
  • Frameworks with carboxylic acid groups show strong CO2 affinity with high enthalpy (up to 44.6 kJ/mol).
  • CTF-CSU41 (sodium carboxylate-anchored) achieved record SO2 uptake (6.7 mmol g-1) at low partial pressure.

Conclusions:

  • Hierarchically porous CTF-CSUs with appended functional groups are effective sorbents for acid gases.
  • Pore engineering in these materials leads to exceptional CO2 and SO2 adsorption capacities.
  • These findings suggest broad applications for porous organic polymers in environmental remediation.