Comparison of the degradation of p-hydroxybenzoic acid in aqueous solution by several oxidation processes.
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*).
Beltran-Heredia
J
J
Departamento de Ingenieria Quimica y Energetica, Universidad de Extremadura, Badajoz, Spain. jbelther@unex.es
Torregrosa
J
J
Dominguez
J R
JR
Peres
J A
JA
D006861:Hydrogen Peroxide / Q000494:pharmacology; D007501:Iron / Q000494:pharmacology; D007700:Kinetics; D010084:Oxidation-Reduction / Q000187:drug effects; D010226:Parabens / Q000737:chemistry*; D012996:Solutions
C045076:Fenton's reagent; D010226:Parabens; D012996:Solutions; D006861:Hydrogen Peroxide; D007501:Iron; C038193:4-hydroxybenzoic acid