Photocatalytic Degradation of BPA by Z‐Type Heterojunction FeTiO ₃ @G‐C ₃ N ₄ Under Visible Light

Abstract In this study, single‐phase g‐C 3 N 4 and FeTiO 3 catalysts were synthesized by thermal polymerization and hydrothermal methods, and FeTiO 3 @g‐C 3 N 4 binary composites were successfully constructed by hydrothermal method. The crystal structure, morphology, and photoelectric properties of the samples were characterized in all aspects by characterization methods such as XRD, FI‐IR, SEM, XPS, BET, UV–vis, and PL, and the effects of different doping ratios, catalyst injection, initial concentration of pollutants, pH, and light source on the degradation performance of bisphenol A (BPA) were investigated. It was shown that spherical chalcogenide FeTiO 3 particles were successfully loaded on the lamellar g‐C 3 N 4 surface to form a composite catalyst with a specific surface area of 18.403 m 2 /g and a pore size of 14.636 nm. FeTiO 3 @g‐C 3 N 4 (1:3) achieved 65.59% degradation of 20 mg/L BPA solution under visible light and maintained 58.38% removal after four cycles, in which ·O 2 − and ·OH radicals were the main active species, and the degradation process conformed to the quasi‐primary kinetic model. In this research, a Z‐scheme heterojunction is constructed to improve the electron transport path and effectively slow down the recombination of photogenerated electrons and holes, which provides a feasible pathway for the efficient degradation of novel pollutants, such as BPA, and opens up a new direction for photocatalytic pollution treatment.