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Isolation and characterization of cellulosic fibers from kenaf bast using steam explosion and Fenton oxidation treatment

Journal Article · · Cellulose
 [1];  [2];  [3];  [3];  [2];  [4]
  1. Qingdao University (China). College of Textiles
  2. Qingdao University (China). College of Textiles; Laboratory of New Fiber Material and Modern Textile, Qingdao (China)
  3. Laboratory of New Fiber Material and Modern Textile, Qingdao (China)
  4. Laboratory of New Fiber Material and Modern Textile, Qingdao (China); Univ. of Tennessee, Knoxville, TN (United States). Department of Forestry, Wildlife, and Fisheries, Department of Chemical and Biomolecular Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Degumming is the dominant method to isolate cellulosic fibers in the textile industry. High content of lignin is the principle obstacle in bast-fibers degumming. In this study, in order to remove lignin efficiently, the treatment using steam explosion coupled with Fenton oxidation was conducted on kenaf bast. The influence and mechanism of the combined treatment of steam explosion and Fenton oxidation were studied. Fiber microstructure, composition proportion and distribution, cellulose Segal crystallinity and polymerization as well as residual lignin structure were analyzed. The results showed that the pretreatment of steam explosion could sufficiently extract most of the hemicellulose from kenaf bast. Also, the Fenton oxidation followed by alkaline boiling could effectively remove the lignin from the fiber, especially from the fiber surface. The refined dry fibers produced only remained 8.82% of hemicellulose and 9.36% of lignin. And the whole treatment process didn’t change the cellulose crystalline structure but could gradually degrade hemicellulose, lignin and other amorphous gummy matter as well as disordered areas in cellulose, leading to the increase of fiber Segal crystallinity from 62.02 to 70.12%. Part of cellulose was damaged with the increase of degumming intensity, resulting in the decrease of the polymerization degree of cellulose. Meanwhile, the structure of residual lignin changed during the degumming stages of steam explosion, Fenton oxidation and alkaline boiling. In conclusion, all the results revealed that the treatment of combined steam explosion and Fenton oxidation is significantly effectual for isolating bast-fibers.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1468052
Journal Information:
Cellulose, Journal Name: Cellulose Journal Issue: 9 Vol. 25; ISSN 0969-0239
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Inhibiting degradation of cellulose dissolved in ionic liquids via amino acids journal January 2019
An alkali-free method to manufacture ramie fiber journal November 2018

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