The Peroxysilicate Question. 29Si-NMR Evidence for the Role of Silicates in Alkaline Peroxide Brightening of Mechanical Pulp |
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| Authors: | Stephen D Kinrade David G Holah Geoffrey S Hill Kimberley E Menuz Constance R Smith |
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| Affiliation: | Department of Chemistry , Lakehead University , Thunder Bay, Ontario, Canada , P7B 5E1 |
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| Abstract: | The influence of hydrogen peroxide on the chemistry of aqueous silicates was investigated by high-resolution 29Si-NMR and electrochemical methods. 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 thus might be to affect the activity of free radical species which mediate H2O2 bleaching and decomposition reactions. Attempts to prepare the widely reported peroxysilicates from silicate/H2O2/NaOH mixtures resulted in the isolation of Na2O2·8H2O. |
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