Abstract
Novel fluorine doped TiO2/diatomite (F-T/DE) composites with visible-light responding activity were fabricated through a facile sol-gel method in this study. The as-synthesized F-T/DE-1.0% (1.0% fluorine content) composite exhibited enhanced photocatalytic activity in degrading rhodamine B (RhB) under visible-light illumination, the reaction rate constant of which was nearly up to 4.4 times and 26.1 times higher than that of F-T-1.0% (fluorine doped TiO2 with 1.0% content) and pure TiO2, respectively. It is indicated that the anatase TiO2 nanoparticles were firmly and homogeneously loaded on the surface of diatomite and fluorine ions were successfully incorporated into the lattice of TiO2. In addition, the construction of composite can effectively promote the generation of oxidative radicals and reduce the recombination probability of photogenerated electron-hole pairs and thus contribute to the enhancement of photoactivity under visible light. The enhanced photocatalytic activity of F-T/DE can be attributed to the fluorine doping induced oxygen vacancies and much more exposed highly active (001) facets, as well as the carrier effect (smaller grain size, well distribution and enhanced adsorption ability).
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