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Anion swap unlocks sevenfold CO₂ capture in polyionic liquids

Phys · · 445 words · By Tohoku University

Researchers from Nitto Boseki Co., Ltd. and Tohoku University discovered that exchanging counter anions in polyionic liquids (PILs) can significantly increase CO2 adsorption capacity. By purifying the materials to remove inorganic salt impurities, they found that larger anions lead to higher capture efficiency, offering a new design guideline for carbon capture technology.

open_in_new Read the original article: https://phys.org/news/2026-05-anion-swap-sevenfold-capture-polyionic.html

analyticsAnalysis

10%
Propaganda Score
confidence: 95%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

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

check_circle Corroborated 7
info Single Source 2
help Insufficient Evidence 1
schedule Pending 1
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“A joint research team from Nitto Boseki Co., Ltd. (Nittobo) and Tohoku University has revealed that polyionic liquids (PILs) can achieve high carbon dioxide (CO₂) adsorption when their counter anions are exchanged.”
CORROBORATED
Multiple web search results (EurekAlert, Research News) confirm a joint research effort involving Tohoku University and the development of PILs where CO2 adsorption is enhanced by designing/exchanging counter anions.
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wikipedia NEUTRAL — This is a list of notable companies based in Japan. For further information on the types of business entities in this country and their abbreviations, see "Business entities in Japan". Note that 株式会社 …
https://en.wikipedia.org/wiki/List_of_companies_of_Japan
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web search NEUTRAL — A joint or articulation (or articular surface) is the connection made between bones, ossicles, or other hard structures in the body which link an animal's skeletal system into a functional whole. [1][…
https://en.m.wikipedia.org/wiki/Joint
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+ 1 more evidence source
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“The research was led by Associate Professor Kouki Oka of the Institute of Multidisciplinary Research for Advanced Materials, Tohoku University”
CORROBORATED
Two independent web sources (EurekAlert and Research News) explicitly state that Associate Professor Kouki Oka of the Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, led the research.
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web search NEUTRAL — The research was led by Associate Professor Kouki Oka of the Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, with the results published online in the chemical engine…
https://www.eurekalert.org/news-releases/1127444
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web search NEUTRAL — The research team, led by Associate Professor Kouki Oka from Tohoku University's Institute of Multidisciplinary Research for Advanced Materials, overcame longstanding compatibility issues between orga…
https://qazaqgreen.com/en/news/world/2973/
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web search NEUTRAL — The research was led by Associate Professor Kouki Oka of the Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, with the results published online in the chemical engine…
https://www.tohoku.ac.jp/en/press/new_material_technology_bo…
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“the results published online in Reaction Chemistry & Engineering.”
CORROBORATED
Multiple sources (EurekAlert, Research News) confirm the results were published online in the journal 'Reaction Chemistry & Engineering'.
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wikipedia NEUTRAL — In chemistry, yield, also known as reaction yield or chemical yield, refers to the amount of product obtained in a chemical reaction. Yield is one of the primary factors that scientists must consider …
https://en.wikipedia.org/wiki/Yield_(chemistry)
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wikipedia NEUTRAL — Chemical reaction engineering (reaction engineering or reactor engineering) is a specialty in chemical engineering or industrial chemistry dealing with chemical reactors. Frequently the term relates …
https://en.wikipedia.org/wiki/Chemical_reaction_engineering
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wikipedia NEUTRAL — The reaction rate or rate of reaction is the speed at which a chemical reaction takes place, defined as proportional to the increase in the concentration of a product per unit time and to the decrease…
https://en.wikipedia.org/wiki/Reaction_rate
+ 3 more evidence sources
info
“The joint research team—which also includes Kazuhiko Igarashi, Senior Technical Supervising SV at Nittobo—successfully removed inorganic salts by precisely purifying the PILs.”
SINGLE SOURCE
While one web search result mentions the use of SEM-EDX to confirm the removal of chlorine-based contaminants, the specific mention of Kazuhiko Igarashi is not corroborated by the provided evidence snippets.
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web search NEUTRAL — Employing advanced characterization tools such as Scanning Electron Microscopy coupled with Energy Dispersive X-ray Spectroscopy (SEM-EDX), the researchers confirmed the complete removal of chlorine-b…
https://scienmag.com/breakthrough-material-technology-achiev…
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web search NEUTRAL — Poly (ionic liquid) (or polymerized ionic liquids, PIL) and poly (deep eutectic solvents) (or polymerized deep eutectic solvents, PDESs) represent innovative advancements in green and sustainable mate…
https://www.sciencedirect.com/science/article/pii/S016773222…
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web search NEUTRAL — Abstract This review provides an overview of the current state-of-the-art and major trends in the application of protic ionic liquids (PILs) to sustainable chemistry. Following a brief description of …
https://pubs.rsc.org/en/content/articlehtml/2024/gc/d3gc0329…
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“They discovered that increasing the size of the counter anion significantly improves the CO2 adsorption capacity.”
CORROBORATED
Multiple sources confirm that CO2 adsorption capacity in PILs can be enhanced by designing the counter anions and that anion size affects this capacity.
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web search NEUTRAL — Poly(ionic liquid)s (PILs) are solid materials composed of cationic or anionic polymers combined with counter ions.This work truly demonstrates that CO2 adsorption capacity can be enhanced by designin…
https://pubs.rsc.org/en/content/articlehtml/2026/re/d5re0053…
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web search NEUTRAL — Poly(ionic liquid)s (PILs) assemble ILs unique properties, with those of polymers being versatile materials for CO2 capture from flue gas (CO2/N2) and natural gas (CO2/CH4).
https://www.researchgate.net/publication/322173283_Cellulose…
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web search NEUTRAL — Theoretical calculations indicate that CO2 molecules interact primarily with halogen anions and methyl groups on quaternary ammonium via various weak intermolecular interactions. Among these interacti…
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5149174
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“Notably, the material using the largest anion achieved an adsorption capacity seven times greater than the raw material.”
CORROBORATED
Two independent sources confirm the specific result: the material with the largest anion (TFMS-) achieved an adsorption capacity seven times greater than the starting/raw material.
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web search NEUTRAL — The material with the largest anion (TFMS⁻) achieved the highest performance, with an adsorption capacity seven times greater than the starting material. This research has established a new performanc…
https://www.brightsurf.com/news/86Z0Z9G8/new-material-techno…
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web search NEUTRAL — The poly(ionic liquid)s had enhanced CO2 sorption capacities and fast sorption/desorption rates compared with room temperature ionic liquids.(2005) [32] provided that CO2 adsorption in polyionic liqui…
https://www.researchgate.net/publication/230039697_Polyionic…
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web search NEUTRAL — front-line healthcare workers showed an increased risk for reporting a positive...
https://www.thelancet.com/journals/lanpub/article/PIIS2468-2…
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“PILs with a quaternary ammonium structure are known to perform well.”
CORROBORATED
Multiple sources state that PILs with a quaternary ammonium structure are known to exhibit high CO2 adsorption capacity.
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web search NEUTRAL — Among the quaternary ammonium cations known to exhibit high CO2 adsorption capacity, P[DADMA][Cl] contains the highest density of cationic sites, indicating the potential for further enhanced CO2 adso…
https://pubs.rsc.org/en/content/articlehtml/2026/re/d5re0053…
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web search NEUTRAL — PILs are considered promising materials for this purpose because they combine the high CO₂ affinity of ionic liquids with the stability and ease of processing of polymers. In particular, PILs with a q…
https://www.nationaltribune.com.au/new-material-technology-b…
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web search NEUTRAL — Poly (ionic liquid)s (PILs) have received great attention recently for their potential applications in gas capture. In this work, quaternization reaction and radical polymerization were applied to the…
https://www.researchgate.net/publication/332435321_Sorption_…
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“the researchers focused on poly(diallyldimethylammonium chloride) (P[DADMA][Cl]), a material with a high density of positive charges.”
CORROBORATED
Evidence from 'Anion size-dependent carbon dioxide adsorption capacity...' confirms the researchers focused on P[DADMA][Cl] due to its high density of cationic sites.
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web search NEUTRAL — 1 day ago · 07 May 2026 Early-career researchers do more ‘disruptive’ science than veterans Analysis of papers from millions of scientists shows that older researchers tend to stick with ideas from th…
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web search NEUTRAL — Mar 24, 2026 · Scientific researchers design studies, analyze data, and build the knowledge base that drives medicine and technology forward. Here’s what the job really…
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“They replaced the chloride (Cl⁻) ion with three anions of different sizes—acetate (AcO⁻), thiocyanate (SCN⁻), and trifluoromethanesulfonate (TFMS⁻)”
INSUFFICIENT EVIDENCE
No evidence was provided in the search results specifically listing the replacement of chloride with acetate, thiocyanate, and trifluoromethanesulfonate, although TFMS- is mentioned in claim 5.
info
“The researchers used Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDX) to confirm the total disappearance of chlorine from the raw material and any reaction by-products”
SINGLE SOURCE
One web search result explicitly mentions using SEM-EDX to confirm the complete removal of chlorine-based contaminants post ion-exchange.
schedule
“Kohei Okubo et al, Anion size-dependent carbon dioxide adsorption capacity in high-purity diallyldimethylammonium-based poly(ionic liquid)s, Reaction Chemistry & Engineering (2026). DOI: 10.1039/d5re00535c”
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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.