Vol.8, No.6, 2020, pp.703-713, doi:10.32604/jrm.2020.09055
OPEN ACCESS
ARTICLE
NaOH/Urea Swelling Treatment and Hydrothermal Degradation of Waste Cotton Fiber
  • Lixia Gao1, Sheng Shi1,2,*, Wensheng Hou1, Shuhua Wang1, Zhifeng Yan1, Chao Ge1
1 College of Textile Engineering, Taiyuan University of Technology, Jinzhong, 030600, China
2 Jihua 3542 Textile Company Limited, Xiangyang, 441000, China
* Corresponding Author: Sheng Shi. Email: shisheng3100@126.com
(This article belongs to this Special Issue: Renewable materials for sustainable development)
Received 08 November 2019; Accepted 24 March 2020; Issue published 12 May 2020
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+ could catalyze the hydrolysis of cotton fiber more effectively due to damage to crystal structure and hydrogen bonds.
Keywords
Waste cotton fibers; NaOH/urea; pretreatment; hydrolyze; recycling and reusing
Cite This Article
Gao, L., Shi, S., Hou, W., Wang, S., Yan, Z. et al. (2020). NaOH/Urea Swelling Treatment and Hydrothermal Degradation of Waste Cotton Fiber. Journal of Renewable Materials, 8(6), 703–713.