Degradation of Orange IV dye solution catalyzed by PVDF/Fe3+-TiO ₂ catalytic membrane in the presence of H₂O₂

A new heterogeneous PVDF/Fe³⁺-TiO₂ catalytic membrane is prepared by sol-gel method, which had a well catalytic activity to decompose H₂O₂ . The effect of initial pH, e initial concentration of H₂O₂ and Orange IV, temperature, and membrane area on the reaction rate is discussed. The PVDF/Fe³⁺-Ti₂ catalytic membrane can effectively decolorize Orange IV in the pH range of 3.0-5.0. The optimal concentration of H₂O₂ is 15mmol/L. The reaction rate constant is proportional to the initial concentrations of Orange IV. The higher the temperature, the faster the reaction rate is, this reaction follows pseudo-first-order kinetics with activation energy of 1.54kJ/mol. Reuse of catalyst did not decrease the removal rate of Orange IV. The experiments of t-butanol, EDTA and XPS measurement showed that ·OH, the electron hole and the ferryl are all the reactive species in the degradation of Orange IV.