Abstract
The reaction between ozone and lignin in aqueous solutions catalyzed by Mn(II) ions is studied. The rate of destruction for aromatic structures of lignin is found to increase in the presence of Mn(II) ions. However, the greatest catalytic effect is observed upon the transformation of aliphatic acids that are difficult to oxidize with ozone. The introduction of catalyst raises the total consumption of ozone from 3 to 7 mol per each structural unit of lignin. A scheme is proposed for the transformation of phenol fragments of lignin using ozone with the participation of Mn(II) ions: at the initial stage, we observe the ozone oxidation of lignin and Mn(II) to Mn(III) ions stabilized with products of lignin oxidation and accompanied by the formation of chelate complexes, and the Mn(III) chelate complexes act as low-molecular mediators, attacking phenol structures and initiating radical processes.
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Original Russian Text © A.N. Mitrofanova, A.G. Khudoshin, V.V. Lunin, 2013, published in Zhurnal Fizicheskoi Khimii, 2013, Vol. 87, No. 7, pp. 1149–1153.
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Mitrofanova, A.N., Khudoshin, A.G. & Lunin, V.V. Mechanism of the catalytic ozonization of lignin in the presence of Mn(II) ions. Russ. J. Phys. Chem. 87, 1124–1128 (2013). https://doi.org/10.1134/S0036024413070212
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DOI: https://doi.org/10.1134/S0036024413070212