@Article{jrm.2020.09055,
AUTHOR = {Lixia Gao, Sheng Shi, Wensheng Hou, Shuhua Wang, Zhifeng Yan, Chao Ge},
TITLE = {NaOH/Urea Swelling Treatment and Hydrothermal Degradation of Waste Cotton Fiber},
JOURNAL = {Journal of Renewable Materials},
VOLUME = {8},
YEAR = {2020},
NUMBER = {6},
PAGES = {703--713},
URL = {http://www.techscience.com/jrm/v8n6/39016},
ISSN = {2164-6341},
ABSTRACT = {In this study, waste cotton fabric was used as cellulose raw material and
pretreated in aqueous NaOH/urea solution system to investigate the effect of
NaOH/urea pretreatment solution on the hydrolysis of cotton fiber. The cotton
fiber was pretreated with different conditions of aqueous NaOH/urea solution,
and the pretreated cotton fiber was hydrolyzed under the same conditions as
the original cotton fiber. The results of characterization analysis showed that water
retention value of pretreated cotton fiber was higher than that of unpretreated sample. Moreover, the cotton fiber presented both a convoluted structure and a coarser
surface, XRD results suggested that the crystallinity degree of cellulose decreased
dramatically, more cellulose II appeared, and the hydrogen bond is broken.
Among the different pretreatment conditions, the pretreatment effect was the best
when the reaction temperature was 0°C, the solid-liquid ratio was 2:50, and the
NaOH/urea ratio was 7:12. The hydrolysis experiments of pretreated and unpretreated cotton fibers showed that when the hydrothermal temperature was 230°C,
the heat preservation was 2 h, and the hydrochloric acid concentration was 5 wt.
%, the glucose yield reached 29.99%. H<sup>+</sup> could catalyze the hydrolysis of cotton
fiber more effectively due to damage to crystal structure and hydrogen bonds.},
DOI = {10.32604/jrm.2020.09055}
}