Abstract
The kinetics of ozonization of sodium lignosulfate (LS) in the presence of H2O2 was studied. The effective rate constants for the oxidation of LS and the total ozone consumption were determined. The k eff = 30 ± 8 M−1 s−1 value was found to be independent of the concentration of H2O2. The total ozone consumption decreased as the concentration of H2O2 increased from 1.0 × 10−4 to 1.0 × 10−3 M because of the participation of the radicals generated in the O3 + H2O2 reaction in LS transformations. The kinetic and UV and IR spectroscopy data allowed the conclusion to be drawn that the destruction of the LS aromatic system in the LS + O3 + H2O2 reaction was caused by the interaction of LS with O3, whereas radicals generated in this system contributed to deeper destruction of LS in the interaction of aliphatic LS macromolecule fragments with low-molecular-weight polymer oxidation products. The depth of polymer oxidation could be changed by varying the content of hydrogen peroxide in the system for LS ozonization.
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Original Russian Text © M.M. Ksenofontova, A.N. Mitrofanova, N.A. Mamleeva, V.V. Lunin, 2007, published in Zhurnal Fizicheskoi Khimii, 2007, Vol. 81, No. 5, pp. 820–824.
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Ksenofontova, M.M., Mitrofanova, A.N., Mamleeva, N.A. et al. The ozonization of sodium lignosulfonate in the presence of hydrogen peroxide. Russ. J. Phys. Chem. 81, 706–710 (2007). https://doi.org/10.1134/S0036024407050081
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DOI: https://doi.org/10.1134/S0036024407050081