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Isolation of cellulose nanofibers from Oryza sativa residues via tempo mediated oxidation

  • Madivoli, Edwin S. Chemistry Department, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya - Department of Chemistry, University of Fribourg, Fribourg, Switzerland
  • Kareru, Patrick G. Chemistry Department, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya
  • Gachanja, Anthony N. Chemistry Department, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya
  • Mugo, Samuel M. Chemistry Department, McEwan University, Edmonton, Alberta, Canada
  • Sujee, David M. Department of Physical Sciences, Karatina University, Karuri, Kenya
  • Fromm, Katharina M. Department of Chemistry, University of Fribourg, Fribourg, Switzerland
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    18.05.2020
Published in:
  • Journal of Natural Fibers. - 2020, p. 1–13
English Cellulose nanocrystals (CNCs) or cellulose nanofibers (CNFs) with different morphologies, chemical, mechanical and physical properties can be obtained when microcrystalline cellulose is subjected to enzymatic, chemical or mechanical treatment. With the aim of utilizing cellulose nanofibrils (CNFs) from Oryza sativa, we isolated microcrystalline cellulose using the Kraft process, followed by successive fiber fibrillation using mechanical grinding, then (2,2,6,6-Tetramethylpiperidin-1-yl)oxyl (TEMPO) mediated oxidation. Analysis of pulp fibers obtained after each treatment step revealed that fiber properties such as length, crystallinity and crystal size changed when the pulp was subjected to mechanical grinding, ultrasonication and TEMPO mediated oxidation. The degree of crystallinity of the fibers increased while crystal size and fiber length decreased after each treatment. TEMPO mediated oxidation led to a decrease in fiber length and an increase in degree of crystallinity of the fibers as compared to mechanical treatment and ultrasonication. It further introduced carboxyl functional groups (COOH) on the surface of the fibrils, which implies that the nanofibers obtained in this study could be further functionalized. Hence, TEMPO mediated oxidation offers the possibility of further chemical functionalization of cellulose nanofibers isolated from agricultural residues.
Faculty
Faculté des sciences et de médecine
Department
Département de Chimie
Language
  • English
Classification
Chemistry
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/308592
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