Preparation And Photocatalytic Properties Of Bismuth Titanate/Graphite Phase Carbon Nitrite Composite

g-C₃N₄ and Bi₁₂TiO₂₀ were prepared by polycondensation and hydrothermal treatment method respectively. Bi₁₂TiO₂₀/g-C₃N₄ composite photocatalytic materials were prepared by a simple Ultrasound treatment method with g-C₃N₄ and Bi₁₂TiO₂₀ as raw materials. The Bi₁₂TiO₂₀/g-C₃N₄ composites were characterized by XRD, FT-IR, SEM, TEM, UV-vis/DRS and PL. The photocatalytic activities of Bi₁₂TiO₂₀/g-C₃N₄ composite photocatalytic materials were evaluated by degradation of aqueous RhB and PNP under the visible light irradiation.Additionally, the best degradation conditions of aqueous RhB and PNP were determined through systematical investigation. At proper g-C₃N₄ loading, the photocatalytic activity of Bi₁₂TiO₂₀/g-C₃N₄ outperforms pure g-C₃N₄ and Bi₁₂TiO₂₀. The main active species yielded in the g-C₃N₄-and Bi₁₂TiO₂₀/g-C₃N₄-catalyzed RhB degradation systems were also investigated by the free radical and hole scavenging experiments. Accordingly, the photodegradation mechanism was given. And 10 wt.% Bi₁₂TiO₂₀/g-C₃N₄ was chosen to evaluate the recyclability of the Bi₁₂TiO₂₀/g-C₃N₄ photocatalysts by five times' RhB degradation reaction.The separation and transportation of photogenerated electrons and holes were investigated by photoelectrochemistry experiments and fluorescence spectra analysis. The specific process of the transportation of photogenerated carriers was studied by the band structure, which provided theoretical basis for the design of composite photocatalysts.