Isolation and characterization of lignocellulose nanofibers from different wheat straw pulps.

Abstract:

:Wheat straw was cooked under different pulping processes: Soda (100°C, 7% NaOH, 150min), Kraft (170°C, 16% alkalinity, 25% sulfidity, 40min) and Organosolv (210°C, 60% ethanol, 60min). Once the pulps were obtained, lignocellulose nanofibers (LCNF) were isolated by mechanical process and TEMPO-mediated oxidation followed by a high pressure homogenization. After pulping process, the different pulps were characterized and its chemical composition was determined. The pulps characterization indicates that the Soda process is the process that, despite producing less delignification, retains much of the hemicelluloses in the pulp, being this content a key factor in the nanofibrillation process. Regarding the LCNF obtained by mechanical process, those nanofibers isolated from Organosolv wheat pulp (OWP) and Kraft wheat pulp (KWP) show low values for nanofibrillation yield, specific surface area and greater diameter. However, those nanofibers isolated from Soda wheat pulp (SWP) reach much higher values for these parameters and presents a diameter of 14nm, smaller than those obtained by TEMPO-mediated oxidation from OWP. Smaller diameters are generally obtained in TEMPO-oxidized LCNF. This work concludes that the lignin content does not affect greatly to obtain LCNF as does the hemicellulose content, so it is accurate to use a soft pulping process.

journal_name

Int J Biol Macromol

authors

Sánchez R,Espinosa E,Domínguez-Robles J,Loaiza JM,Rodríguez A

doi

10.1016/j.ijbiomac.2016.08.019

subject

Has Abstract

pub_date

2016-11-01 00:00:00

pages

1025-1033

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(16)31152-7

journal_volume

92

pub_type

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