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Abstract
AbstractRadiation chemistry and photocatalysis are introduced as complementary methods for the study of the radical- and redox-induced degradation of organic substrates. Particular focus is devoted on the reductive and oxidative formation and destruction of halogenated organic acids, as intermediates in the degradation of halo- genated hydrocarbons, in dilute aqueous solutions. The specific aim of this comparative essay is to point out the fundamental similarities between a radiation chemical and photocatalytical approach but, at the same time, to demonstrate that and why significant differences may, nevertheless, be observed. The examples presented and discussed are concerned with (i) the oxidatively and reductively induced degradation of 1,1,1-trichloroethane to organic acids, (ii) corresponding experiments on the degradation of trifluoro-, trichloro- and tribromoacetic acid, (iii) peculiarities of the degradation processes in the absence of oxygen, and (iv) the importance of the crosstermination reaction between halogenated peroxyl radicals and superoxide, O
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