Fluorination of Defective Titanium Dioxide with an Efficient Photocatalytic Activity

Fluorinated-defective titanium dioxide (F-TiO2−x) was successfully synthesized by fluorination of TiO2 through the hydrothermal method. The microstructure and physicochemical properties catalyst were characterized scanning electron microscopy, transmission X-ray diffraction, photoelectron spectroscopy, UV–vis diffuse reflectance spectroscopy (UV–vis DRS). As expected, F-TiO2−x demonstrates high photocatalytic activity stability on dye degradation. Results indicated that fluorine element can effective for stabilizing Ti3+ oxygen vacancies surface F-TiO2−x. With increase in amount hydrofluoric acid (HF) added, performance prepared material is first increased then decreased, shows best when HF added 0.3 mL. For three different dyes, catalysts all showed a certain degradation performance, effect rhodamine B best.