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In developing materials for CO2 capture, we need to be careful about the CO2 footprint of the material itself. Lignin has already sequestered biogenic carbon incorporated in its structure (i.e., atmospheric CO2 is captured during photosynthesis and plant growth). When extracted from wood through environmentally benign ways (e.g., using the polyethylene glycol (PEG) solvolysis process developed in our laboratory at FFPRI), lignin can be considered a superior starting material compared to petroleum-based analogues in respect to CO2 footprint. Furthermore, lignin is attractive for the synthesis of carbon materials, as it already has a polyaromatic structure, thus higher conversion yields can be realized compared to other biomass components (like cellulose).
We fabricated a unique large-pore mesoporous carbon from a PEG-grafted technical lignin (coined as glycol lignin). This material showed an exceptional CO2 capture-and-release profile due to capillary condensation in large mesopores close to the saturation pressure (3.2 MPa) at 270 K. On account of this phenomenon, a more energy-efficient pressure-swing regeneration process can be realized compared to a benchmark nanoporous (activated) carbon. Large-pore mesoporous carbons are considered those that have pores larger than 10 nm, thus cannot be fabricated using conventional soft-templating methods based on Pluronic® surfactants. In this presentation, we will share our latest results on our ongoing efforts in developing a new family of CO2 capture materials based on the nanoconfinement-induced capillary condensation phenomenon, offering energy-efficient, cost effective regeneration options.

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Keyword: lignin, mesoporous carbon, CO2 reocovery

Conference: The 19th Pacific Polymer Conference (PPC19) (2025-07-06 - 2025-07-10)

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Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6056

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Updated at: 2025-12-23 11:43:38 +0900

Published on MDR: 2026-01-10 08:21:19 +0900