Photocatatalytic Degradation of an Azo Dye by TiO2 Nanocomposites Modified with Pt, Pd and Ni

TiO2 nanoparticles were synthesized by sol-gel method. The modification of prepared nanoparticles was achieved with transition metals Pt، Pd and Ni. The prepared photocatalysts were characterized by XRD، BET، SEM، DRS and FT-IR Techniques. The kinetic and efficiency of photocatalytic degradation of azo dyeAB92 were investigated. The effect of some parameters such as catalyst concentration، acidity of medium، dye concentration، calcination temperature and the type of doped metal on degradation efficiency were investigated. The experimental results were indicated that the photocatalytic degradation rate is strongly influenced by pH and also it was found that the best calcination temperature is 500ºC.