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Comparison of the degradation of p-hydroxybenzoic acid in aqueous solution by several oxidation processes
J Beltran-Heredia1, J Torregrosa, J R Dominguez
1Departamento de Ingenieria Quimica y Energetica, Universidad de Extremadura, Badajoz, Spain. jbelther@unex.es
Chemosphere
|December 2, 2000
Abstract:
A comparative study is made of 12 methods of chemical oxidation applied to degrading p-hydroxybenzoic acid in aqueous solution. The oxidation processes tested were: UV, O3, UV/TiO2, O3/Fe2+, O3/H2O2, O3/UV, UV/H2O2, H2O2/Fe2+, H2O2/Fe2+/O3, UV/H2O2/O3, H2O2/Fe2+/UV and O3/UV/H2O2/Fe2+. The 12 processes were ranked by reactivity. In a kinetic study, the overall kinetic rate constant was split up into three components: direct oxidation by UV irradiation (photolysis), direct oxidation by ozone (ozonation), and oxidation by free radicals (mainly OH*).