Photocatalytic Properties of Magnetic Activated Carbon Supported F-doped TiO_2

Fluorine-doped TiO2(F-TiO2) prepared by Sol-Gel method was coated on magnetic activated carbon, and the magnetically separable composite photocatalyst(F-TMAC) was synthesized. The prepared samples were characterized by XRD, SEM, UV-Vis, XPS and vibrating sample magnetometer(VSM). The photocatalytic activity was determined by degradation of 100 mg/L reactive brilliant red(X-3B) in a 200 mL aqueous solution with 0.2 g catalyst.The results showed that the photocatalytic activity of such type catalyst was better than that of Degussa P25. The degradation ratio of X-3B was 99.8% under 18 W UV lamp irradiation and 83.1% under 250 W visible lamp irradiation,respectively. Furthermore, the photocatalyst can be separated easily by an external magnetic field with good reuse performance. The degradation ratio of X-3B was decreased by 6% after 5 cycles.