Dual S-scheme graphitic carbon-doped α-Bi2O3/β-Bi2O3/Bi5O7I ternary heterojunction photocatalyst for the degradation of Bisphenol A

Graphitic carbon-doped alpha-Bi2O3/beta-Bi2O3/Bi5O7I ternary heterojunction photocatalysts were synthesized by calcination of urea, malonic acid and BiOIO3 in a simple and low-cost way. The photocatalytic activity of the photocatalysts was evaluated by the degradation of Bisphenol A (BPA) under simulated sunlight irradiation. The reaction rate constants of graphitic carbon-doped alpha-Bi2O3/beta-Bi2O3/Bi5O7I were 4.6, 4.2, 17.8, and 231 times higher than those of BIO-550 (Bi5O7I), MA-BIO (alpha-Bi2O3/Bi5O7I), MACN and CN-BIO (alpha-Bi2O3/beta-Bi2O3), respectively. The enhanced photocatalytic activity is due to the high separation efficiency of heterogeneous photogenerated electron-hole pairs, which is caused by the synergistic effect of the heterojunction between the different components and the efficient electron transfer efficiency of graphitic carbon. In addition, a dual S -scheme heterojunction mechanism has been proposed to explain the excellent redox properties of the composites.

Automated summary

Graphitic carbon-doped alpha-Bi2O3/beta-Bi2O3/Bi5O7I ternary heterojunction photocatalysts were successfully synthesized via a simple and low-cost method using urea, malonic acid, and BiOIO3. The photocatalytic activity of the catalysts was evaluated by the degradation of Bisphenol A (BPA) under simulated sunlight irradiation. The graphitic carbon-doped alpha-Bi2O3/beta-Bi2O3/Bi5O7I photocatalysts exhibited significantly higher reaction rate constants compared to other catalysts, thanks to the synergistic effect of the heterojunction between different components and the efficient electron transfer efficiency of graphitic carbon. A dual S -scheme heterojunction mechanism was proposed to explain the excellent redox properties of the composites.