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Amine-Functionalized Lignin for CO₂ CapturePart 2: A Double Amine Grafting Strategy.

Hadi Shayesteh¹, Abdelhamid Sayari¹

¹Centre for Catalysis Research and Innovation, Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada.

|November 24, 2025

Summary

Researchers developed a novel lignin-based material for efficient carbon dioxide (CO2) capture. This double amine functionalization significantly boosts CO2 uptake and stability, offering a sustainable solution for greenhouse gas mitigation.

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Area of Science:

Materials Science
Environmental Chemistry
Chemical Engineering

Background:

Global warming is driven by greenhouse gas emissions, necessitating effective carbon dioxide (CO2) capture technologies.
Amine-based materials are crucial for post-combustion CO2 capture, but sustainable and biodegradable options are underexplored.
Lignin, a sustainable biopolymer, offers potential for CO2 adsorption due to its tunable surface chemistry.

Purpose of the Study:

To valorize lignin for enhanced CO2 capture through a double amine functionalization strategy.
To investigate the CO2 adsorption performance of modified lignin materials under varying conditions.

Main Methods:

Lignin was functionalized with diethylenetriamine (DETA) to create DETA-aminated lignin (DAL).
A subsequent grafting procedure with triaminosilane (TRI) was performed on DAL to yield TRI/DAL.
CO2 uptake, amine efficiency, and cyclic stability of the modified materials were evaluated.

Main Results:

TRI/DAL exhibited significantly higher CO2 uptake (1.31 mmol/g) compared to individually modified lignin.
CO2 capture was enhanced by humidity, reaching 1.84 mmol/g at 55% relative humidity.
The material demonstrated excellent cyclic stability, retaining over 95% of its capacity after ten cycles.

Conclusions:

Double amine functionalization of lignin is a promising approach for developing efficient and sustainable CO2 adsorbents.
The developed TRI/DAL material shows potential for industrial applications in mitigating CO2 emissions.
Moisture positively influences both CO2 capture capacity and the material's long-term performance.