The photocatalyst consisted of titanium dioxide loaded on natural zeolite was prepared by impregnation of tetrabutyl titanate acidic solution followed by calcination. The photocatalytic activity of the catalyst towards dichlorvos has been examined as function of TiO 2 amount, calcination temperature of precursor, pH of sample solution and added amount of H 2O 2. The results indicated that the catalyst prepared by calcination at 200 ℃ showed the highest activity and 89% of Dichlorvos in concentration of 1.0×10 -4 mol/L could be degraded over the catalyst under sunlight illumination for 6 hours.
