THE PEROXYSILICATE QUESTION - SI-29-NMR EVIDENCE FOR THE ROLE OF SILICATES IN ALKALINE PEROXIDE BRIGHTENING OF MECHANICAL PULP

Authors
KINRADE SD HOLAH DG HILL GS MENUZ KE SMITH CR
Citation
Sd. Kinrade et al., THE PEROXYSILICATE QUESTION - SI-29-NMR EVIDENCE FOR THE ROLE OF SILICATES IN ALKALINE PEROXIDE BRIGHTENING OF MECHANICAL PULP, Journal of wood chemistry and technology, 15(2), 1995, pp. 203-222
Citations number
37
Categorie Soggetti
Materials Science, Paper & Wood
Journal title
Journal of wood chemistry and technology → ACNP
ISSN journal
02773813
Volume
15
Issue
2
Year of publication
1995
Pages
203 - 222
Database
ISI
SICI code
0277-3813(1995)15:2<203:TPQ-SE>2.0.ZU;2-3
Abstract
The influence of hydrogen peroxide on the chemistry of aqueous silicat es was investigated by high-resolution Si-29-NMR and electrochemical m ethods. The observations indicate that dissolved silicates form labile complexes with radical H2O2-decomposition products, possibly O2.-. An important role of soluble silicates in peroxide bleaching liquors thu s might be to affect the activity of free radical species which mediat e H2O2 bleaching and decomposition reactions. Attempts to prepare the widely reported peroxysilicates form silicate/H2O2/NaOH mixtures resul ted in the isolation of Na2O2.8H2O.