The Oxidative Destruction of Lignin in the Ozonation of Wood

N. A. Mamleeva^a, S. A. Autlov^b, A. V. Fionov^a, N. G. Bazarnova^b, and V. V. Lunin^a

^a Faculty of Chemistry, Moscow State University, Moscow, 119991 Russia

^b Altai State University, ul. Dmitrova 66, Barnaul, 656099 Russia

e-mail: mamleeva@kge.msu.ru

Received May 21, 2008

Abstract—The oxidative destruction of lignin in the ozonation of aspen wood was studied. The kinetic curves
of ozone consumption for samples with different contents of water were obtained. The consumption of ozone
increased as the content of water grew. The second derivatives of the UV absorption spectra of lignin were
obtained to show that the principal direction of lignin transformations under the action of ozone was the destruc-
tion of its aromatic constituents with the formation of carboxyl- and carbonyl-containing compounds. Measure-
ments of the UV diffuse reflectance and EPR spectra of wood showed that the ozonation of wood caused the
destruction of lignin quinoid structures. Part of lignin remained unchanged under the action of ozone. A key
role in the destruction of wood lignin was played by ozone dissolved in water. Varying the content of water in
wood samples allows various lignin transformation products to be obtained through ozonation.

DOI: 10.1134/S0036024409050112

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