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| Extraction and Characterization of Cellulose from Corn Straw Bark and Pith |
| Received:October 28, 2021 |
| DOI：10.11980/j.issn.0254-508X.2022.05.009 |
| Key Words:corn straw corn straw bark and pith cellulose purification |
| Fund Project:东北林业大学“双一流专项-创新人才培养”（4111370301）。 |
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| Abstract:Corn straw was used as raw material to study the properties of cellulose in the bark and pith of corn straw. The purified cellulose from corn straw bark and pith was obtained by extracting the bark and pith with benzene-ethanol， respectively， and further removing lignin with sodium chlorite under acidic environment， and finally removing pentosane by potassium hydroxide. The results showed that the fiber bundles in the straw bark were more neatly and tightly arranged， and the chemical fractions of straw bark and pith were similar. The yield of purified cellulose from corn straw bark and pith were 38.9% and 38.2%， respectively， of which the α-cellulose content was 87.5% and 82.4%， respectively， and most of pentosane and lignin were removed. The crystalline structure of purified cellulose from straw bark and pith was still cellulose type I. Compared with corn straw bark and pith before purification， the crystallinity of purified cellulose increased from 51.2% and 30.4% to 67.7% and 42.1%， respectively. The starting and maximum decomposition temperatures of purified cellulose were increased compared with those of straw bark and pith， and the thermal stability was better than that of corn straw bark and pith. |
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