Synthesis of BiOF/TiO 2 Heterostructures and Their Enhanced Visible‐Light Photocatalytic Activity

Novel BiOF/TiO 2 heterostructures with controlled amounts of BiOF and TiO 2 have been successfully synthesized via a simple solid‐state sintering method. The structural, morphological and optical properties were analyzed using several characterization techniques. A shift of the TiO 2 absorption edge toward the visible region was observed. The optimal molar ratio of BiOF/TiO 2 was found to be (1:3) with a photodegradation percentage of 91.2 % and it was 7 and 5 times more efficient than that of pure BiOF or TiO 2 nanopowder, respectively. BiOF/TiO 2 (1:3) heterojunction has showed high photodegradation stability for the Rh B photodegradation after three cycles. In the proposed photocatalytic mechanism, TiO 2 absorbed the visible light and carried out the photocatalytic reaction owing to the decrease of its band gap value due to the formation of oxygen vacancies, while BiOF played an important role in the charge separation process due to the intimate contact of the BiOF/TiO 2 heterojunction.