Photochemically enhanced degradation of phenol using heterogeneous Fenton—type catalysts

The degradation of phenol was carriced out using heterogeneous Fenton-type catalysts in the presence of H2O2 and UV.Catalysts were prepared by exchanging and immobilizing Fe^2+ in zeolite 13X,silica gel or Al2O3.The concentration of phenol solution was 100mg/L.The amount of H2O2 added was the stoichiometric amount of H2O2 required for the total oxidation of phenol.Under the irradiation of medium pressure light(300W)phenol was mineralized within 1 h in the presence of Fe^2+/zeolite 13X.The COD removal rate was enhanced in the presence of Fe^2+/zeolite 13X compared to that of Fe^2+/silica gel of Fe^2+/Al2O3.Analogous homogenous photo-Fenton reaction with equivalent Fe^2+ was also carried out to evaluate the catalysis efficiency of Fe^2+/zeolite 13X.Results showed that the COD removal rate was near to that of homogeneous Fenton,while heterogeneous Fe^2+/zeolite 13X catalyst coule be recycled.