Abstract
Cellulose samples with molecular weights ranging from 8.39 × 104 to 11.00 × 104 g/mol were obtained from wheat straw. The dewaxed wheat straw was pretreated with aqueous hydrochloric acid followed by delignification using an environmentally benign poly (ethyleneglycol)/salt aqueous biphasic system. The yield of cellulose was in the range of 48.9%–55.5% and the cellulose contained 1.2%–3.2% hemicelluloses, and 0.97%–3.47% lignin. All the isolated cellulose samples could be directly dissolved in a 6 wt-% NaOH/4 wt-% urea aqueous solution through a precooling-thawing process to form a homogenous solution. The separation process was investigated and the obtained cellulose and its solution were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and energy dispersive X-ray apparatus, and X-ray diffraction. The results revealed that aqueous soluble cellulose can be directly prepared from wheat straw by this method and this study opens a novel pathway to prepare cellulosic materials from agricultural waste.
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Yan, L., Zhao, Y., Gu, Q. et al. Isolation of highly purity cellulose from wheat straw using a modified aqueous biphasic system. Front. Chem. Sci. Eng. 6, 282–291 (2012). https://doi.org/10.1007/s11705-012-0901-5
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DOI: https://doi.org/10.1007/s11705-012-0901-5