The performance of a visible light-responsive material Fe₃O₄/Bi₂WO₆ cooperating with peroxymonosulfate to degrade...

In this study, the visible light-responsive catalysts Fe₃O₄/Bi₂WO₆ were prepared and characterized by BET, SEM, EDS, XRD, XPS, and MPMS. The performances of five catalysts (0.05 Fe/Bi, 0.13 Fe/Bi, 0.17 Fe/Bi, 0.21 Fe/Bi, and 0.30 Fe/Bi) for photocatalytic degradation of bisphenol A under visible light (300-W Xe lamp) were compared. Among five catalysts, 0.17 Fe/Bi (the molar ratio of Fe₃O₄ to Bi₂WO₆ was 0.17) acquired the highest BPA photocatalytic removal of 90.2% at 120 min. With the synergistic effect between Vis/0.17 Fe/Bi and peroxymonosulfate (PMS), the BPA removal obtained was as high as 100% at 90 min ([BPA] = 100 mg/L, [0.17 Fe/Bi] = 1.25 g/L, [PMS] = 2.0 g/L, and T = 25 °C). After five times reused of 0.17 Fe/Bi, its removal of BPA dropped by 13.4% in presence of PMS, which demonstrated 0.17 Fe/Bi possessed relatively stable performance. High BPA degradation was attributed to the attacking effects of various oxide species (SO₄^•-, •OH, h⁺, O₂^•-) generated in the Fe₃O₄/Bi₂WO₆/PMS system under the cooperation of photocatalyst Fe₃O₄/Bi₂WO₆ and oxidizing agent PMS.