Efficient Photocatalytic Degradation of Highly Concentrated Perfluorooctanoic Acid by Bi Self-Doped Bi₂MoO₆

Bi self-doped Bi₂MoO₆ was synthesized by a solvothermal method. The introduction of Bi enhanced the absorption of visible light by the catalyst, and the Bi could act as an electron transfer site to facilitate the separation of photogenerated carriers and enhance the photocatalytic activity of the catalyst for the degradation of PFOA. The oxidation of PFOA by ·O₂^- as the main reactive oxygen species of degradation facilitated its degradation. Under full spectrum illumination for 40 min, the degradation rate of PFOA (100 mg/L) by Bi₃MoO₆ reached 88.1%, which is 3 times that of the original Bi₂MoO₆. The degradation amount reached 88.1 mg·g_cat^-1, and the degradation rate was 2.20 mg·g_cat^-1·min^-1. This work provides new ideas for the modification of catalysts.