Top-Down Production of Nanocellulose from Environmentally Friendly Processes

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Handbook of Green and Sustainable Nanotechnology

Abstract

The production of nanometric size particles from lignocellulosic pulp or waste and other cellulose biomass involves top-down techniques. The first stage is the fractionation of biomass, which is the first opportunity to apply more environmentally friendly methods. Subcritical water or supercritical CO2 are simple methods to extract hemicelluloses and extractives. A recently developed process involves lignin removal by chemical treatment with gamma-valerolactone to obtain a highly purified cellulosic fraction, avoiding subsequent bleaching stages and facilitating the nanofibrillation process. The most studied green methods for nanocellulose production are the enzymatic pretreatment of cellulosic fibers and alternative oxidant methods. Deep eutectic solvents are more efficient than traditional ones or one-pot oxidative hydrolysis to obtain nanocrystalline sizes that minimize wastewater generation. This chapter covers the most environmentally friendly processes and reagents that have been reported for nanocellulose production, including the fractionation of the raw material. Reported properties of nanocellulose produced by green solvents pretreatments are similar to those obtained by traditional chemical reagents such as TEMPO-oxidation. Then, the future of nanocellulose production from environmentally friendly processes is promising.

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Abbreviations

AHP:

Alkaline hydrogen peroxide

APS:

Ammonium persulfate

APS-NC:

Nanocellulose from APS treatment

ATU:

Ammonium thiocyanate-urea

BGs:

β-glucosidases

BNC:

Bacterial nanocellulose

ChCl:

Choline chloride

CNC:

Cellulose nanocrystals

DES:

Deep eutectic solvent

DP:

Polymerization degree

ECF:

Elemental chlorine-free

EGs:

Endo-1,4-glucanases

EXs:

Exoglucanases

F-DES:

FeCl3-catalyzed DES

FE-SEM:

Field emission scanning electron microscopy

GHU:

Guanidine hydrochloride-urea

GVL:

Gamma-valerolactone

HBA:

Hydrogen-bond acceptor

HBD:

Hydrogen-bond donor

ILs:

Ionic liquids

NC:

Nanocellulose

NFC:

Nanofibrillated cellulose

OA:

Oxalic acid

Pc:

Critical pressure

SC-CO2:

Supercritical carbon dioxide

SW:

Subcritical water

Tc:

Critical temperature

TCF:

Totally chlorine-free

TEM:

Transmission electron microscopy

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Ehman, N., Vallejos, M.E., Area, M.C. (2022). Top-Down Production of Nanocellulose from Environmentally Friendly Processes. In: Shanker, U., Hussain, C.M., Rani, M. (eds) Handbook of Green and Sustainable Nanotechnology. Springer, Cham. https://doi.org/10.1007/978-3-030-69023-6_46-1

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  • DOI: https://doi.org/10.1007/978-3-030-69023-6_46-1

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-69023-6

  • Online ISBN: 978-3-030-69023-6

  • eBook Packages: Springer Reference Chemistry and Mat. ScienceReference Module Physical and Materials ScienceReference Module Chemistry, Materials and Physics

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