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Novel insights on room temperature-induced cellulose dissolution mechanism via ZnCl 2 aqueous solution: Migration, penetration, interaction, and dispersion.
- Source :
-
International journal of biological macromolecules [Int J Biol Macromol] 2024 Jun; Vol. 272 (Pt 2), pp. 132912. Date of Electronic Publication: 2024 Jun 06. - Publication Year :
- 2024
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Abstract
- The unique molecular structure of cellulose makes it challenging to dissolve at room temperature (R.T.), and the dissolution mechanism remains unclear. In this study, we employed ZnCl <subscript>2</subscript> aqueous solution for cellulose dissolution at R.T., proposing a novel four-stage dissolution mechanism. The efficient dissolution of cellulose in ZnCl <subscript>2</subscript> aqueous solution at R.T. involves four indispensable stages: rapid migration of hydrated Zn <superscript>2+</superscript> ions towards cellulose, sufficient penetration between cellulose sheets, strong interaction with cellulose hydroxyl groups, and effective dispersion of separated cellulose chains. The proposed four-stage dissolution mechanism was validated through theoretical calculations and experimental evidence. The hydrated Zn <superscript>2+</superscript> ions in ZnCl <subscript>2</subscript>  + 3.5H <subscript>2</subscript> O solvent exhibited ideal migration, penetration, interaction, and dispersion abilities, resulting in efficient cellulose dissolution at R.T. Moreover, only slight degradation of cellulose occurred in ZnCl <subscript>2</subscript>  + 3.5H <subscript>2</subscript> O at R.T. Consequently, the regenerated cellulose materials obtained from ZnCl <subscript>2</subscript>  + 3.5H <subscript>2</subscript> O (R.T.) exhibited better mechanical properties. Notably, the solvent recovery rate reached about 95 % based on previous usage during five cycles. The solvent is outstanding for its green, low-cost, efficiency, simplicity, R.T. conditions and recyclability. This work contributes to a better understanding of the cellulose dissolution mechanisms within inorganic salt solvents at R.T., thereby guiding future development efforts towards greener and more efficient cellulosic solvents.<br />Competing Interests: Declaration of competing interest The authors declare no competing interests.<br /> (Copyright © 2024 Elsevier B.V. All rights reserved.)
Details
- Language :
- English
- ISSN :
- 1879-0003
- Volume :
- 272
- Issue :
- Pt 2
- Database :
- MEDLINE
- Journal :
- International journal of biological macromolecules
- Publication Type :
- Academic Journal
- Accession number :
- 38851617
- Full Text :
- https://doi.org/10.1016/j.ijbiomac.2024.132912