Extraction of Nanocellulose from Yerba Mate Residues Using Steam Explosion, TEMPO-mediated Oxidation and Ultra-fine Friction Grinding. Issue 15 (23rd November 2022)

• Record Type: Journal Article
• Authors: Gemmer, Ruan Ezequiel; Borsoi, Cleide; Hansen, Betina; Dahlem Júnior, Marcos Aurélio; Francisquetti, Edson Luiz; Rossa Beltrami, Lilian Vanessa; Zattera, Ademir José; Catto, André Luis
• Is Part Of: Journal of natural fibers. Volume 19:Issue 15(2022)
• Page Start: 10539
• Page End: 10549
• Publication Date: 2022-11-23
• Subjects: Cellulose nanofiber -- yerba mate -- Tempo-mediated oxidation -- steam explosion -- ultra-fine friction grinding -- agro-industrial residue; 纤维素纳米纤维 -- 叶尔巴马特 -- 介导氧化 -- 蒸汽爆炸 -- 超细摩擦磨削 -- 农用工业废渣; Textile research -- Periodicals; Textile research; Periodicals; 677.005
• DOI: 10.1080/15440478.2021.1994095
• Languages: English
• ISSNs: 1544-0478

Abstract

ABSTRACT: In this work, we evaluated the extraction of nanocellulose from agro-industrial residue of yerba mate (YM, Ilex paraguariensis, St.Hil) sticks through chemical (bleaching and 2, 2, 6, 6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation), physical (steam explosion) and mechanical (ultra-fine friction grinding) treatments, divided into three distinct sequences for method comparison. The results showed that steam explosion as the initial treatment step makes an increase of up to 23% in the crystallinity index of cellulose nanofiber (CNF) in relation to the raw sample. The TEMPO-mediated oxidation resulted in more dispersed CNF, verified by transmission electron microscopy (TEM). Samples treated by steam-explosion and ultrafine grinding showed a higher yield in relation to steam-explosion and oxidative treatment (24.3% versus 16.2% respectively). CNFs with a diameter of 6 nm and a length range of 2200 to 2600 nm were obtained.