A novel approach for the oxidative catalysis employing polyoxometalate-laccase system: application to the oxygen bleaching of kraft pulp

authors	Tavares, APM; Gamelas, JAF; Gaspar, AR; Evtuguin, DV; Xavier, AMRB
nationality	International
journal	CATALYSIS COMMUNICATIONS
author keywords	polyoxometalate; Keggin structure; laccase; oxygen delignification; bleaching; Kraft pulp
keywords	LIGNIN MODEL COMPOUNDS; TRAMETES-VERSICOLOR; DELIGNIFICATION; 1-HYDROXYBENZOTRIAZOLE; HETEROPOLYANIONS; MEDIATORS
abstract	A novel approach for the catalytic oxygen bleaching of kraft pulp using the heteropolyanion [SiW11MnIII(H2O)O-39](5-) (SiW11 Mn-III) and laccase of Trametes versicolor is proposed. The oxidation of the residual lignin in pulp with the heteropolyanion was followed by the catalyst re-oxidation by laccase in a separate stage. The alterative treatment in a multi-stage process with SiW11MnIII at 110 degreesC and with laccase at 45 degreesC allowed a sustainable eucalypt kraft pulp delignification with removal of about 50% of the residual lignin with minimal polysaccharides damage. Heteropolyanion maintained stable after redox turnovers during the treatments. (C) 2004 Elsevier B.V. All rights reserved.
publisher	ELSEVIER SCIENCE BV
issn	1566-7367
year published	2004
volume	5
issue	9
beginning page	485
ending page	489
digital object identifier (doi)	10.1016/j.catcom.2004.06.002
web of science category	Chemistry, Physical
subject category	Chemistry
unique article identifier	WOS:000223629100003