Enhancement of UV-assisted photo-Fenton degradation of reactive orange 4 using TiO2-P25 nanoparticles (original) (raw)

A combined homogeneous and heterogeneous photocatalytic decolourisation and degradation of a chlorotriazine azo dye reactive orange 4 (RO 4) have been carried out using ferrous sulphate/ferrioxalate with H 2 O 2 and TiO 2-P25 nanoparticles. Enhancement in the photo-Fenton processes has been observed by the addition of TiO 2-P25. UV/ferrous/H 2 O 2 /TiO 2 and UV/ferrioxalate/H 2 O 2 /TiO 2 processes are found to be more efficient than the individual photo-Fenton and UV/TiO 2-P25 processes. The use of ferrioxalate in the combined process is found to be more advantageous. The effects of various experimental parameters such as pH, initial H 2 O 2 , Fe 2+ , Fe 3+ and TiO 2 concentrations on these combined photocatalytic processes have been investigated. All these parameters strongly influenced the removal rate. The optimum operating conditions of these combined processes are reported.