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

Abstract

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 BTO_900,2/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.