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Cellulose oxidation by Laccase-TEMPO treatments
info:eu-repo/semantics/openAccess ;ISSN: 0144-8617 ;EISSN: 1879-1344 ;DOI: 10.1016/j.carbpol.2016.11.033
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Title:
Cellulose oxidation by Laccase-TEMPO treatments
Author:
Quintana, Elisabet
;
Roncero Vivero, María Blanca
;
Vidal Lluciá, Teresa
;
Valls Vidal, Cristina
Subjects:
Blanqueig
;
Bleaching
;
Carboxyl group
;
Carboxyl groups
;
Cellulose
;
Cel·lulosa
;
Dissolving pulp
;
Enginyeria
paperera
;
Hemiacetal linkage
;
Laccase
;
Oxidation
;
Pasta de paper
;
Primeres matèries papereres
;
Química
;
TEMPO
;
Wood pulp
;
Àcids carboxílics
;
Àrees temàtiques de la UPC
Description:
In this work, laccase-TEMPO (Lac-T) treatments were applied to bleached commercial dissolving pulp in order to introduce carbonyl and carboxyl groups, which were found to improve dry and wet strength-related properties. Also the solubility behavior towards xanthate reactions was assessed. The effect of a refining step (R) before the oxidative treatment, the absence or presence of oxygen pressure, TEMPO dose (2 or 8% oven dried pulp) and reaction time (8 or 20 h) were thoroughly examined. Treatments conducted in the presence of oxygen pressure exhibited greater amount of functional groups. Introducing a pre-refining treatment resulted in similar functional groups but higher wet strength was achieved. Specifically, a high W/D strength ratio was observed, indicating that wet strength-related property was satisfactorily developed. Besides the fact that all Lac-T treatments caused severe cellulose degradation, no fiber strength loss was detected. In fact, all oxidized samples presented higher Wet Zero-Span Tensile Strength, mainly in R+ Lac-T (O2) sample, which suggested the formation of hemiacetal linkages between the new introduced aldehyde groups and available free hydroxyl groups resulting from fibrillation
Creation Date:
2017-02
Language:
English
Identifier:
ISSN: 0144-8617
EISSN: 1879-1344
DOI: 10.1016/j.carbpol.2016.11.033
Source:
Recercat
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