Delignification of Deciduous Wood under the Action of Hydrogen Peroxide and Ozoneстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Kinetic curves of the dependence of ozone specific absorption (Qr, sp) upon the ozonation of aspen wood pretreated with solutions of hydrogen peroxide of various concentrations (from 5×10–4 to 2×10–1 mol/L) are obtained. The water content in the samples being 56 ± 3%. The initial rate of ozone absorption and total ozone consumption (Qinlet) are determined. Wood samples are investigated by IR and UV diffuse reflection spectroscopy. Based on the kinetics and spectral data, it is concluded that pretreating wood with a H2O2 solution allows the degree of delignification (DD) to be increased at a constant Qinlet value. The DD is maximal at C(H2O2)= 5x10-3 mol/L and is 88% in contrast to a sample ozonated without H2O2 (DD = 85%). The role of pretreatment with hydrogen peroxide and the subsequent action of the O3/H2O2 system in the process of delignification of wood is analyzed.