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Development of ‘Lignin-First’ Approaches for the Valorization of Lignocellulosic Biomass
Open AccessFeature PaperArticle

Horticultural Plant Residues as New Source for Lignocellulose Nanofibers Isolation: Application on the Recycling Paperboard Process

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Chemical Engineering Department, Bioagres group, Universidad de Córdoba, 14014 Córdoba, Spain
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Department of Food Science and Technology, Universidad de Córdoba, 14014 Córdoba, Spain
3
Technological Institute of Packaging, Transport and Logistic (ITENE), 46980 Paterna, Spain
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Group LEPAMAP, Department of Chemical Engineering, Universidad de Girona, 17071 Girona, Spain
*
Authors to whom correspondence should be addressed.
Academic Editor: Fabrizio Sarasini
Molecules 2020, 25(14), 3275; https://doi.org/10.3390/molecules25143275
Received: 11 June 2020 / Revised: 9 July 2020 / Accepted: 14 July 2020 / Published: 18 July 2020
(This article belongs to the Special Issue Lignocellulosic Biomass)
Horticultural plant residues (tomato, pepper, and eggplant) were identified as new sources for lignocellulose nanofibers (LCNF). Cellulosic pulp was obtained from the different plant residues using an environmentally friendly process, energy-sustainable, simple, and with low-chemical reagent consumption. The chemical composition of the obtained pulps was analyzed in order to study its influence in the nanofibrillation process. Cellulosic fibers were subjected to two different pretreatments, mechanical and TEMPO(2,2,6,6-Tetramethyl-piperidin-1-oxyl)-mediated oxidation, followed by high-pressure homogenization to produce different lignocellulose nanofibers. Then, LCNF were deeply characterized in terms of nanofibrillation yield, cationic demand, carboxyl content, morphology, crystallinity, and thermal stability. The suitability of each raw material to produce lignocellulose nanofibers was analyzed from the point of view of each pretreatment. TEMPO-mediated oxidation was identified as a more effective pretreatment to produce LCNF, however, it produces a decrease in the thermal stability of the LCNF. The different LCNF were added as reinforcing agent on recycled paperboard and compared with the improving produced by the industrial mechanical beating. The analysis of the papersheets’ mechanical properties shows that the addition of LCNF as a reinforcing agent in the paperboard recycling process is a viable alternative to mechanical beating, achieving greater reinforcing effect and increasing the products’ life cycles. View Full-Text
Keywords: lignocellulose nanofibers; horticultural residues; paperboard; recycling lignocellulose nanofibers; horticultural residues; paperboard; recycling
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MDPI and ACS Style

Bascón-Villegas, I.; Espinosa, E.; Sánchez, R.; Tarrés, Q.; Pérez-Rodríguez, F.; Rodríguez, A. Horticultural Plant Residues as New Source for Lignocellulose Nanofibers Isolation: Application on the Recycling Paperboard Process. Molecules 2020, 25, 3275.

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