期刊
CARBOHYDRATE POLYMERS
卷 294, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2022.119803
关键词
TEMPO; Nanocellulose; Cellulose nanofibrils; Catalyst recycling
资金
- National Key Research and Development Program of China [2019YFE0106900]
- National Natural Science Foundation of China [22008178]
- China Postdoctoral Science Foundation [2020M670658]
A novel strategy for direct reuse and extraction recovery of TEMPO in the production of cellulose nanofibrils (CNFs) has been developed, enabling clean and cost-effective production of CNFs with negligible loss of catalyst activity.
TEMPO-oxidized cellulose nanofibrils (CNFs) possess lots of attractive properties. However, recycling of TEMPO is desirable because of ecological and economic demands. In this study, a novel strategy integrating direct reuse and extraction recovery of TEMPO was developed. 50 % of filtrates after TEMPO oxidation were directly reused and half of the fresh TEMPO was added to maintain a constant dosage, the obtained CNFs within 2 cycles shared similar carboxylate contents, crystallinity, and homogeneous width compared to the original ones. Furthermore, TEMPO in another 50 % of filtrates was extracted by ethyl acetate followed by distillation. The CNFs produced using the extracted TEMPO had almost the same properties compared to those of original ones, suggesting a negligible loss of activity of the recovered catalyst. Compared to the traditional route, the combined strategy exhibited a 31.3 % reduction in production costs, which enables clean and cost-effective production of CNFs and shows a promising industrial feasibility.
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