We investigated effects of ozone treatment on solubility of cellulose and chemical composition in cellulose extracted from palm fiber. The initial holocellulose, α‐cellulose, and lignin contents of the extracted cellulose were 88.0, 81.9, and 8.75%, respectively. The extracted cellulose was treated with ozone and NaOH solution. Ozone treatment for 5 hr at 40°C using 3% citric acid decreased the lignin content from 8.75 to 2.71%. Under these conditions, the degree of polymerization (DP) of the cellulose decreased to 29 from 160 and the carboxyl content increased to 2.05 mmol/g. When the solid phase was treated with NaOH after ozone treatment, the mass of the solid phase decreased as the ozone treatment time increased. The lowest mass was 0.43 g. Additionally, the mass of cellulose regenerated from the liquid phase increased with increasing treatment time. The highest mass of regenerated cellulose was 0.54 g. The masses of the solid phase and regenerated cellulose obtained without ozone treatment under the same conditions were 0.76 and 0.18 g, respectively. These results suggest that ozone treatment improves the solubility of cellulose by converting hydroxyl groups in the cellulose to carboxyl groups and reducing the DP.

中文翻译：

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臭氧处理可提高从棕榈纤维中提取的纤维素的溶解度

我们研究了臭氧处理对从棕榈纤维提取的纤维素中纤维素的溶解度和化学组成的影响。提取纤维素的初始全纤维素，α-纤维素和木质素含量分别为88.0、81.9和8.75％。提取的纤维素用臭氧和NaOH溶液处理。使用3％柠檬酸在40°C臭氧处理5小时，木质素含量从8.75％降低到2.71％。在这些条件下，纤维素的聚合度（DP）从160降低到29，并且羧基含量增加到2.05mmol / g。当在臭氧处理后用NaOH处理固相时，随着臭氧处理时间的增加，固相的质量降低。最低质量为0.43 g。另外，从液相再生的纤维素的质量随着处理时间的增加而增加。再生纤维素的最高质量为0.54g。在相同条件下未经臭氧处理获得的固相和再生纤维素的质量分别为0.76和0.18g。这些结果表明臭氧处理通过将纤维素中的羟基转化为羧基并降低DP来改善纤维素的溶解性。