The decomposition of p -hydroxybenzoic acid in aqueous solution by UV radiation and by H 2 O 2 / UV radiation has been studied. The experimental results indicated that the kinetics of both oxidation processes fit well by pseudo-first-order kinetics. In the second oxidation process, the overall kinetic rate constant was split into two components: direct oxidation by UV irradiation (photolysis) and oxidation by free radicals (mainly OH • ) generated in the decomposition of H 2 O 2 . The effect of pH (2, 5, 7, and 9), temperature (10, 20, 30, and 40 °C), and initial hydrogen peroxide concentration (1, 2.5, and 5 mM) on the conversion of p -hydroxybenzoic acid was established. The importance of these two reaction paths for each specific value of pH, temperature, and initial hydrogen peroxide concentration was quantified. Last, a general expression is proposed for the reaction rate which takes into account both pathways and is a function of known operating variables.
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Beltrán‐Heredia et al. (2001) studied this question.
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