Water-assisted SO <sub>2</sub> capture in pyridine-functionalized COFs
Covalent organic frameworks (COFs) have emerged as promising materials for gas separation and purification due to their high porosity, structural tunability and chemical stability. However, the practical application of COFs in SO<sub>2</sub> capture is hindered by severe performance loss under humid conditions. To address this challenge, we develop a water-assisted adsorption strategy by incorporating pyridine groups into chemically robust COFs. Two COFs, TpBpy and TpTtp, exhibit high adsorption capacities and cycling stability. Notably, TpTtp exhibits a SO<sub>2</sub> uptake of 0.75 mmol g<sup>-1</sup> under dry simulated flue gas (2500 ppm SO<sub>2</sub>, 15% CO<sub>2</sub> in N<sub>2</sub>), which increases by 36% to 1.02 mmol g<sup>-1</sup> at 50% relative humidity. Mechanistic analysis confirms that water promotes SO<sub>2</sub> binding through synergistic interactions with pyridine sites. These results demonstrate the potential of COFs for deep desulfurization in humid flue gas streams.
Authors
- Xuefeng Bai (ORCID: https://orcid.org/0000-0002-8757-7034)
- Lin‐Hua Xie (ORCID: https://orcid.org/0000-0003-0017-3887)
- Kecheng Wang (ORCID: https://orcid.org/0000-0002-6896-5189)
- Guang-Rui Si (ORCID: https://orcid.org/0000-0001-6783-4390)
- Jia-Ao Lv
- Jian‐Rong Li (ORCID: https://orcid.org/0000-0002-8101-8493)
- Shengjun Wang (ORCID: https://orcid.org/0000-0002-1873-2037)
- Zilong Tang (ORCID: https://orcid.org/0009-0004-4716-9644)
- Qiang Chen (ORCID: https://orcid.org/0000-0003-1445-7792)
Institutions
- Beijing University of Technology (CN)
- Beijing University of Chemical Technology (CN)
Publication Details
- Journal
- Chemical Communications
- Published
- 2025-12-04
- DOI
- https://doi.org/10.1039/d5cc04274g
- Primary Topic
- Covalent Organic Framework Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00