Nanofibrils from oil palm trunk: effect of delignification and fibrillation technique

Lukmanul Hakim Zaini (Korresp. Autor*in), Wolfgang Gindl-Altmutter, Claudia Gusenbauer, Istie Sekartining Rahayu, Muhammad Adly Rahandi Lubis, Andreas Mautner, Stefan Veigel

Veröffentlichungen: Beitrag in FachzeitschriftArtikelPeer Reviewed

Abstract

Oil palm trunk (OPT) is an inexpensive, abundantly available by-product of palm oil production which is typically not put to material use. Due to its comparably high cellulose content, OPT represents a suitable raw material for the preparation of cellulose nanofibrils (CNFs). Aiming for full utilization of the raw material and minimized energy demand, non-delignified and partially delignified (alkali-pretreated) OPT was subjected to mechanical fibrillation in the present study. As compared to CNFs from fully delignified OPT, the lignin-rich microfibrils obtained by this approach generally showed higher average fibril diameters, lower thermal stability as well as lower viscosity, and higher sedimentation rate in suspension. However, the combination of alkali-pretreatment and fibrillation by disc-grinding and subsequent high-pressure homogenization resulted in fibrils with properties similar to those of CNFs from fully delignified OPT. As proven by IR-spectroscopy, thermogravimetry and chemical composition analysis, alkali-treated OPT fibrils still contained substantial amounts of residual lignin which could, for instance, act as a natural coupling agent or binder in composite applications. Moreover, the facile delignification process applied herein requires far less chemicals and energy than conventional pulping and is thus beneficial from both the economic and ecological perspective.

OriginalspracheEnglisch
Aufsatznummer19
FachzeitschriftJournal of Wood Science
Jahrgang70
Ausgabenummer1
DOIs
PublikationsstatusVeröffentlicht - Dez. 2024

ÖFOS 2012

  • 205008 Holztechnologie
  • 104011 Materialchemie

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