Discriminating the brightness stability of cellulosic pulp in relation to the final bleaching stage
authors Loureiro, PEG; Domingues, MRM; Fernandes, AJS; Carvalho, MGVS; Evtuguin, DV
nationality International
journal CARBOHYDRATE POLYMERS
author keywords Chlorine dioxide; Chromophores; ESI-MS; Hydrogen peroxide; Pulp bleaching; Raman spectroscopy
keywords KRAFT PULP; EUCALYPTUS-GLOBULUS; RAMAN-SPECTROSCOPY; GLUCURONIC-ACID; CHEMICAL PULPS; CHROMOPHORES; LIGNIN; HEAT; IDENTIFICATION; TEMPERATURE
abstract The reasons for the improved brightness stability of pulp bleached in the final stage with hydrogen peroxide than with chlorine dioxide have been studied. UV-vis Diffuse Reflectance and UV Resonance Raman micro-spectroscopy @ 325 nm were employed to evaluate the chromophores formation/degradation in fully bleached eucalypt kraft pulp while applying a final chlorine dioxide or a hydrogen peroxide bleaching stages. Spectroscopic data were coupled to wet chemistry and mass spectrometry analyses of degradation products arisen during hydrothermal ageing of bleached pulps. The complementary analyses have revealed the important role of partially oxidised carbohydrates and of the residual xylan-lignin complex in ageing reactions. The leaching of degradation products from pulp during the final bleaching stage, rather than specific oxidation patterns of pulp polysaccharides with the bleaching agent was suggested to be a crucial factor predetermining the extent of brightness reversion of pulp. (c) 2012 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0144-8617
year published 2012
volume 88
issue 2
beginning page 726
ending page 733
digital object identifier (doi) 10.1016/j.carbpol.2012.01.024
web of science category Chemistry, Applied; Chemistry, Organic; Polymer Science
subject category Chemistry; Polymer Science
unique article identifier WOS:000301633100044
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journal impact factor 5.158
5 year journal impact factor 5.326
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