Construction of BaTiO3/g-C3N4 S-type heterojunctions for photocatalytic degradation of Tetracycline

Tetracycline, one of the antibiotics, is widely used in a number of fields, and residual Tetracycline in the environment can be a serious threat to the safety of environmental ecosystems. In this paper, a series of BaTiO3/ g-C3N4 composite photocatalysts were designed and synthesized by a combination of solvent volatilization and high-temperature thermal polymerization using BaTiO3 and g-C3N4 as raw materials. Construction of S-type heterojunction between BaTiO3 and g-C3N4 lead to the formation of built-in electric field synergistically with BaTiO3 own ferroelectric polarization to promote the separation efficiency of photogenerated electron-hole pairs. When Tetracycline was used as the target pollutant, the degradation rate of the BTO900,2/CN catalyst was 91.88%, which was 142.73 times higher than the 7% of BaTiO3, which was a significant improvement over the photocatalytic performances of both BaTiO3 and g-C3N4. This provides new ideas for studying BaTiO3-based photocatalyst materials with high photogenerated carrier separation efficiency.