Characteristics of p-hydroxybenzoic acid oxidation using Fenton's reagent.
The objective of this work was to investigate the oxidation of p-hydroxybenzoic acid by the Fenton's reagent. Batch experiments were carried out to investigate the influence of the most important process variables: hydrogen peroxide and ferrous salt concentrations, pH, and temperature. The optimal results obtained indicate that p-hydroxybenzoic acid can be effectively degraded using Fenton's oxidation within 10-min reaction time by using a molar ratio H2O2: p-hydroxybenzoic acid of 4:1 and H2O2:Fe2+ of 15:1, at 30 degrees C and pH=3.0. The behavior of ORP and pH along the reaction time for different values of R (molar ratio H2O2: p-hydroxybenzoic acid) was also discussed. A pseudo-first order model was applied to describe the oxidation kinetics of p-hydroxybenzoic acid by Fenton's reagent.
Peres
José A S
JA
Centro de Química, Departamento de Química, Universidade de Trás-os-Montes e Alto Douro, Vila Real, Portugal. jperes@utad.pt
de Carvalho
Luís H Melo
LH
Boaventura
Rui A R
RA
Costa
Carlos A V
CA
D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D062385:Hydroxybenzoates / Q000737:chemistry*; D007501:Iron / Q000737:chemistry; D019083:Mediterranean Region; D031658:Olea; D016877:Oxidants / Q000737:chemistry; D010084:Oxidation-Reduction; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*
C045076:Fenton's reagent; D062385:Hydroxybenzoates; D016877:Oxidants; D006861:Hydrogen Peroxide; D007501:Iron