Abstract
A novel approach for the catalytic oxygen bleaching of kraft pulp using the heteropolyanion [SiW 11Mn III(H 2O)O 39] 5− (SiW 11Mn 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 SiW 11Mn III at 110 °C and with laccase at 45 °C 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.
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