Abstract
This work demonstrated a green process using deep eutectic solvent (DES) treatment for properties improvements of bamboo dissolving pulp. Results showed that an acidic DES, namely choline chloride-oxalic acid, was the most effective compared to other acidic, alkaline and neutral DESs. Upon the optimum acidic DES treatment (pulp to DES ratio 1:10, 60 °C and 30 min), the pulp viscosity was reduced from 715 mL/g of original pulp to 466 mL/g, while the pulp reactivity increased from 43.0 to 88.1%. The positive results were mainly ascribed to a synergy during the DES treatment: (1) a large number of activated protons (H+) from the acidic DES depolymerized the cellulose chain and destroyed the fiber structure; (2) the vigorous hydrogen bonding competitions between fibers and DES (Ch+ and Cl−) facilitated the fiber swelling and reaction efficiency, thus increasing fiber accessibility/reactivity. DES also featured a high recyclability/reusability after serval reuses. Therefore, this work offers a sustainable and effective alternative for production of premium bamboo dissolving pulp.
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Acknowledgments
The authors would like to acknowledge the financial support from National Natural Science Foundation of China (Nos. 22178206 and 31700510). The project was also supported by the foundation of Guangxi key laboratory of clean pulp & papermaking and pollution control (No. 2021KF16), college of light industry and food engineering, Guangxi University.
Funding
The research grants from funding agencies, the National Natural Science Foundation of China (Nos. 22178206 and 31700510) and Guangxi key laboratory of clean pulp & papermaking and pollution control (No. 2021KF16), college of light industry and food engineering, Guangxi University.
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CD and SN: Conceptualization, Data curation, Validation, Writing-editing and Supervision. XF: Writing-original draft, Methodology, Investigation and Validation. GT: Methodology, Investigation and Validation. CT: Writing-original draft and writing-editing.
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Duan, C., Feng, X., Tian, C. et al. Acidic deep eutectic solvent treatment for viscosity control and reactivity enhancement of bamboo dissolving pulp. Cellulose 30, 2097–2109 (2023). https://doi.org/10.1007/s10570-023-05043-9
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DOI: https://doi.org/10.1007/s10570-023-05043-9