Synthesis of γ-Fe2O3/La/Bi2WO6 composites for enhanced visible light-driven photocatalytic degradation of tetracycline hydrochloride
2022
Li, Zhi | Zhu, XiaoMei | Liu, Yu | Liu, Hui | Sun, Bing
γ-Fe₂O₃/La/Bi₂WO₆ heterojunction composites have been successfully synthesized by simple and convenient hydrothermal method. The photocatalytic activity of the prepared samples was evaluated by the degradation of tetracycline hydrochloride (TCH) solution under simulated visible light irradiation. The results indicated that the removal rate of γ-Fe₂O₃/La/Bi₂WO₆ samples was higher than that of pure Bi₂WO₆ and La/Bi₂WO₆, among which 5%γ-Fe₂O₃/La/Bi₂WO₆ had the highest photocatalytic activity. The removal rate of TCH solution can reach 92.42% in 220 min. The as-prepared samples were characterized by scanning electron microscope (SEM), Fourier transform infrared spectra (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET), and UV–vis diffuse reflectance spectrum (DRS). The material morphology of γ-Fe₂O₃/La/Bi₂WO₆ was nano-flake. γ-Fe₂O₃/La-doped Bi₂WO₆ did not damage the crystal phase and structure of Bi₂WO₆. Through getting insight into the mechanism, γ-Fe₂O₃/La doping increased the specific surface area of Bi₂WO₆ and inhibited the recombination of photogenerated electron pairs, thus enhancing the photocatalytic activity. h⁺ and ·O₂⁻ were the main active substances in the photocatalytic degradation of TCH solution by γ-Fe₂O₃/La/Bi₂WO₆ photocatalysts. In order to better explain the photocatalytic degradation process of TCH solution by γ-Fe₂O₃/La/Bi₂WO₆ photocatalyst, a possible removal mechanism was proposed for the first time. Moreover, γ-Fe₂O₃/La/Bi₂WO₆ sample is magnetic and easy to recover. At the same time, the high stability of γ-Fe₂O₃/La/Bi₂WO₆ sample can be reused.
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