Abstract
Abstract Lignin modifications resulting from different photochemical pre-treatments were studied using chemiluminescent methods. In the oxidation of lignin in NaOH solutions at 25°C, the intensity increased with increasing temperature and can be described by an Arrheniustype exponential equation with an activation energy of 25.8 ± 2.7 kJ/ mol. The oxidation of lignin model compounds under these conditions indicated 1O2 OH′, and O2 generation. Chemiluminescence of the luminol/H2O2/Fe2+ system was used to study decomposition products of lignin upon irradiation. Unirradiated lignin proved to be an excellent radical trap, an effect initially abolished upon irradiation. At longer irradiation times, however, the radical trapping behavior was restored. The action of the perodidase/H2 O2 system onlignin was also investigated using chemiluminescence. Behavior very similar to that using luninol was observed. The intensity increases with increasing time of irradiation up to an optimum value. More prolonged irradiati...
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