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From pore chemistry to carbon capture, new COFs push beyond membrane performance limits

Phys · · 635 words · By Tohoku University
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What to know about From pore chemistry to carbon capture, new COFs push beyond membrane performance limits

Researchers from Tohoku University have developed new heteroatom-engineered covalent organic framework (COF) mixed matrix membranes that improve carbon dioxide separation. The study, published in the Journal of the American Chemical Society, demonstrates that these materials can surpass the 2008 Robeson upper bound for permeability and selectivity.

Propaganda risk 10%
Claims checked 6
Techniques found 0
Topics 0

Coverage spectrum

Coverage gap: Low Left coverage
Left0%
Center80%
Right20%

5 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

From pore chemistry to carbon capture, new COFs push beyond membrane performance limits Sadie Harley Scientific Editor Robert Egan Associate Editor Carbon dioxide (CO2) separation is central to technologies ranging from natural gas purification to hydrogen…

Why it matters

One widely used approach relies on thin filtering materials called membranes.

Common ground

However, these membranes face a major challenge: materials that allow CO2 to pass through quickly are often less effective at separating it from other gases, while highly selective materials usually slow the flow of CO2.

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

Researchers from Tohoku University have developed new heteroatom-engineered covalent organic framework (COF) mixed matrix membranes that improve carbon dioxide separation. The study, published in the Journal of the American Chemical Society, demonstrates that these materials can surpass the 2008 Robeson upper bound for permeability and selectivity.

open_in_new Read the original article: https://phys.org/news/2026-05-pore-chemistry-carbon-capture-cofs.html

analyticsAnalysis

10%
Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

6 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

check_circle Corroborated 4
verified Verified 1
cancel Disputed 1
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“Researchers from Tohoku University and collaborating institutions have now developed a new class of heteroatom-engineered covalent organic framework (COF)-based mixed matrix membranes (MMMs) that overcome this limitation, achieving exceptional CO2 separation performance that surpasses the 2008 Robeson upper bound”
CORROBORATED
Multiple independent web sources confirm that researchers from Tohoku University developed heteroatom-engineered COF-based MMMs that surpass the 2008 Robeson upper bound for CO2 separation.
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wikipedia NEUTRAL — A natural disaster is a sudden event that causes widespread destruction, major collateral damage, or loss of life, brought about by forces other than the acts of human beings. A natural disaster might…
https://en.wikipedia.org/wiki/List_of_natural_disasters_by_d…
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web search NEUTRAL — 6 days ago ... Azine-Linked Covalent Organic Framework (COF)-Based Mixed-Matrix Membranes for CO2/CH4 Separation. Chem. - Eur. J. 2016, 22 (41), 14467 ...
https://pubs.acs.org/doi/10.1021/jacs.5c23169
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web search NEUTRAL — 3 days ago ... Researchers from Tohoku University and collaborating institutions have now developed a new class of heteroatom ... Mixed Matrix Membranes ...
https://www.eurekalert.org/news-releases/1129493
+ 1 more evidence source
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“The work was published in the Journal of the American Chemical Society.”
CORROBORATED
Two independent web sources explicitly state that the work was published in the Journal of the American Chemical Society.
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wikipedia NEUTRAL — Coffinite is a uranium-bearing silicate mineral with formula: U(SiO4)1−x(OH)4x. It occurs as black incrustations, dark to pale-brown in thin section. It has a grayish-black streak. It has a brittle to…
https://en.wikipedia.org/wiki/Coffinite
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web search NEUTRAL — Here we report a heteroatom-engineering strategy that leverages structurally precise covalent organic frameworks (COFs) to transcend this limitation in mixed matrix membranes (MMMs).
https://chemrxiv.org/engage/chemrxiv/article-details/694e994…
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web search NEUTRAL — The work was published in the Journal of the American Chemical Society. How the new materials work. The researchers achieved this breakthrough by designing two new porous materials that were specially…
https://phys.org/news/2026-05-pore-chemistry-carbon-capture-…
+ 1 more evidence source
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“The team developed two similar porous materials, TUS-621 and TUS-622, using chemical components containing either oxygen or sulfur.”
CORROBORATED
Multiple sources confirm the development of TUS-621 and TUS-622, specifying that TUS-622 replaces the oxygen in TUS-621 with sulfur.
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wikipedia NEUTRAL — The Sasanian Empire (), officially Eranshahr (Middle Persian: 𐭠𐭩𐭥𐭠𐭭𐭱𐭲𐭥𐭩, romanized: Ērānšahr, lit. 'Empire of the Iranians'), was an Iranian empire that was founded and ruled by the House of Sasan fro…
https://en.wikipedia.org/wiki/Sasanian_Empire
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wikipedia NEUTRAL — The 2023 Azerbaijan Grand Prix (officially known as the Formula 1 Azerbaijan Grand Prix 2023) was a Formula One motor race held on 30 April 2023 at the Baku City Circuit in Baku, Azerbaijan. It was th…
https://en.wikipedia.org/wiki/2023_Azerbaijan_Grand_Prix
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wikipedia NEUTRAL — The 2023 São Paulo Grand Prix (officially known as the Formula 1 Rolex Grande Prêmio de São Paulo 2023) was a Formula One motor race held on 5 November 2023 at the Interlagos Circuit in São Paulo, Bra…
https://en.wikipedia.org/wiki/2023_São_Paulo_Grand_Prix
+ 3 more evidence sources
verified
“the oxygen-rich TUS-621 showed a stronger attraction to carbon dioxide and allowed the gas to move through more easily, leading to significantly improved CO2 separation performance.”
VERIFIED
Evidence from a specialized report confirms that swapping oxygen (TUS-621) for sulfur (TUS-622) resulted in a 'measurably weaker' effect, implying TUS-621 has the stronger attraction and better performance.
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web search NEUTRAL — Oxygen is a chemical element; it has the symbol O and its atomic number is 8. It is a member of the chalcogen group in the periodic table. It is highly reactive, a nonmetal, and a potent oxidizing age…
https://en.wikipedia.org/wiki/Oxygen
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web search NEUTRAL — In TUS-622, the oxygen atoms are swapped for sulfur atoms, which are bigger and “softer” in their electrical character. The effect is measurably weaker and the experiments confirmed it with striking c…
https://chemenggcalc.com/a-molecule-engineered-to-choose-co2…
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web search NEUTRAL — Like you said, CO2 can bind to the hemoglobin subunit causing a conformational change of the protein decreasing O2 affinity for the molecule; this is known as allosteric inhibition. ALSO CO2 can react…
https://www.khanacademy.org/science/in-in-class-11-biology-i…
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“the optimized TUS-621/Pebax-10% membrane not only surpasses the 2008 Robeson upper bound for CO2/CH4 separation but also maintains outstanding separation performance over broad pressure and temperature ranges during continuous operation over 30 days.”
CORROBORATED
Multiple sources confirm the TUS-621/Pebax-10% membrane surpasses the 2008 Robeson upper bound and maintains performance over 30 days of continuous operation.
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web search NEUTRAL — 3 days ago ... ... separation performance over broad pressure and temperature ranges during continuous operation over 30 days. ... upper-bound plot (2008) for CO2 ...
https://www.miragenews.com/cofs-redefine-membrane-limits-in-…
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web search NEUTRAL — ... 2008 Robeson upper bound. In a 2018 study, Tien-Binh et al. [165] ... performance stability over 30 days of continuous operation, illustrated in Figure 13.
https://www.beilstein-journals.org/bjnano/articles/16/14
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web search NEUTRAL — 4 days ago ... ... higher than Pebax membranes and surpass Robeson 2008 upper bound. ... The optimized TUS-621/Pebax-10% membrane exhibits a CO2 permeability ...
https://www.researchgate.net/publication/405116127_Heteroato…
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“Tsukasa Irie et al, Heteroatom-Engineered Covalent Organic Frameworks Break the CO 2 Separation Trade-Off in Mixed Matrix Membranes, Journal of the American Chemical Society (2026). DOI: 10.1021/jacs.5c23169”
DISPUTED
While the title and journal are corroborated by other sources, the specific DOI provided (10.1021/jacs.5c23169) is associated with a 2015 paper (indicated by '5c' in the JACS DOI format), whereas the claim states the publication year is 2026. This is a significant chronological contradiction.
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web search NEUTRAL — Here we report a heteroatom-engineering strategy that leverages structurally precise covalent organic frameworks (COFs) to transcend this limitation in mixed matrix membranes (MMMs).
https://chemrxiv.org/engage/chemrxiv/article-details/694e994…
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web search NEUTRAL — Covalent Organic Frameworks Break the CO2 Separation Trade-Off in Mixed Matrix Membranes.In a Mixed Matrix Membrane (MMM), the separation of gases is governed by the solution-diffusion model.
https://chemenggcalc.com/a-molecule-engineered-to-choose-co2…
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web search NEUTRAL — Mixed matrix membranes (MMMs) combining the virtues of porous fillers with polymeric matrices have been widely investigated due to their potential to overcome the permeability-selectivity trade-off.
https://scholar.hit.edu.cn/en/publications/recent-advances-i…
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.