期刊
CARBOHYDRATE POLYMERS
卷 223, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2019.115116
关键词
Cellulose nanocrystals; Mixed acid hydrolysis; Oxalic acid; Sulfuric acid; Surface functionalization
资金
- Key Laboratory of Bio-based Material Science & Technology (Northeast Forestry University), Ministry of Education [SWZ-ZD201903]
- Tianjin Municipal Education Commission [2017KJ027]
- China Postdoctoral Science Foundation [2018M631749]
- Tianjin University of Science and Technology National College Students Innovation and Entrepreneurship Training Program [201810057098]
- Foundation of Tianjin Key Laboratory of Marine Resources and Chemistry [2018-07]
- China Scholarship Council [201708120052]
A mild and efficient approach for the preparation of cellulose nanocrystals (CNCs) was developed by using mixed H2SO4/Oxalic acid hydrolysis. In this process, the mixed acid of sulfuric acid, oxalic acid and H2O in an optimal mass ratio of 1:5:4 was used to produce CNCs from bleached eucalyptus kraft pulp (BEKP) at 80 degrees C for 2-5 h. The CNCs with a diameter range of 5-20 nm and a length range of 150-400 nm were obtained at a high yield (>70%) and showed excellent dispersion stability in water and good thermal stability. Moreover, the dosage of sulfuric acid can reduce to 2.4 g/g CNCs in this mixed acid hydrolysis, which is far lower than that of the typical 64% sulfuric acid hydrolysis (55 g/g CNCs, tested in this work). In addition, 91 +/- 2% of oxalic acid could be recovered by a simple recrystallization operation.
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