Lignocellulosics in an ionic liquid, 1-ethylpyridinium chloride: reaction behavior and ion adsorption properties of corresponding humins
Abstract Herein, we studied the reaction behavior of cellulose, Japanese beech (Fagus crenata), and Japanese cedar (Cryptomeria japonica) in an ionic liquid, 1-ethylpyridinium chloride ([EtPy][Cl]), at 120 °C. Depolymerization occurred initially in all of the samples in a manner that formed low mole...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2025-03-01
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| Series: | Journal of Wood Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s10086-025-02185-1 |
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| Summary: | Abstract Herein, we studied the reaction behavior of cellulose, Japanese beech (Fagus crenata), and Japanese cedar (Cryptomeria japonica) in an ionic liquid, 1-ethylpyridinium chloride ([EtPy][Cl]), at 120 °C. Depolymerization occurred initially in all of the samples in a manner that formed low molecular weight compounds, followed by polymerization. The obtained polymers were black in color and ultraviolet-absorbing, and morphologically as well as chemically different from the raw materials, indicating that they were humins. These humins adsorbed cations in the order Ca2+ > Sr2+ > Cs+ > K+ > Na+, Li+. There was selectivity for adsorption of cations; cellulose-derived humins adsorbed Ca2+ particularly easily. The adsorptivity of humins was superior in the order cellulose-derived > beech-derived ≥ cedar-derived. The cation exchange capacity of cellulose-derived humins was higher than that of soil and comparable with that of natural zeolite, suggesting that humins obtained by [EtPy][Cl] treatment can be used as cation adsorbents. |
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| ISSN: | 1611-4663 |