Crystallinity-Enhanced CO₂ Adsorption by Sodium Poly(Heptazine Imide) Frameworks.

ABSTRACT: This work presents sodium poly(heptazine imide) (NaPHI)-based materials, synthesized in a NaCl medium, as highly effective platforms for CO₂ capture. High crystallinity-an often-overlooked aspect in PHI frameworks-is identified as a key factor governing CO₂ adsorption capacity in microporous structures. Thermogravimetric analysis and manometric studies reveal a CO₂ uptake of ≈3.8 mmol g^-1, at 1 bar and 25 °C, surpassing most reported PHI-based adsorbents under similar conditions. Exchanging Na⁺ with K⁺ or Rb⁺ preserves CO₂ adsorption performance, whereas Cs⁺ incorporation induces structural distortion, greatly reducing CO₂ adsorption capacity in PHI. These materials exhibit excelle

SUBMITTER: Ouro P 

PROVIDER: S-EPMC12330333 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature