حذف فتوكاتاليزي اسيد ترفتاليك از پساب هاي پتروشيمي توسط نانو ذرات TiO2

Photo catalytic Degradation of Terephthalic Acid Using TiO2from Petrochemical Wastewater

In the present study, photocatalytic oxidation of terephthalic acid (TPA) was investigated with nano powder of TiO2 (P25). The effect of important parameters such as irradiation intensity and time, initial pH, catalyst loading, initial TPA concentration and present of H202 were studied. Results show that the photocatalytic oxidation process with Ti02 is very effective in degradation of TPA and increasing the time and intensity of irradiation has the positive effect on the rate of degradation of TPA. The optimum initial pH to remove TPA by TiO2 was 6.0 and catalyst loading was 2.5 g/L. Increasing of initial concentration of contaminated has decreasing effect on the rate constants of TPA degradation. Addition of hydrogen peroxide to the system of UV/TiO2 has positive effect on the process. The decreasing rate of TPA in the photocatalytic oxidation process shows the first order kinetic reaction. The constants of Langmuir- Henshelwood model "which is common kinetic in heterogeneous catalytic reactions" kLH andKanpfd were found 2.306 (ppm min-1) and 0.139 (ppm-1) respectively with high regression coefficient.