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<p>A heterojunction photocatalyst NiTiO<sub>3</sub>/BiOCl<sub>0.75</sub>I<sub>0.25</sub> composite was successfully synthesized using a simple room-temperature coprecipitation method. The fabricated material was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and ultraviolet–Visible diffuse reflectance spectroscopy (UV–Vis DRS). The photocatalyst was evaluated for its ability to degrade Rhodamine B (RhB) in aqueous solution under visible light irradiation. The NiTiO<sub>3</sub>/BiOCl<sub>0.75</sub>I<sub>0.25</sub> composite exhibited significantly enhanced photocatalytic performance compared to pure BiOCl<sub>0.75</sub>I<sub>0.25</sub> and NiTiO<sub>3</sub>. Among the prepared samples, the 20&#xa0;wt% NiTiO<sub>3</sub>/BiOCl<sub>0.75</sub>I<sub>0.25</sub> heterojunction demonstrated the highest photocatalytic activity for RhB degradation under visible light with gradation rate was 3 times faster than that of pure BiOCl<sub>0.75</sub>I<sub>0.25</sub>. After 30&#xa0;min of irradiation with a 50&#xa0;W white LED, degradation efficiency was reached a value of 99%. The improved photocatalytic degradation is attributed to the synergistic effect between the large BiOCl<sub>0.75</sub>I<sub>0.25</sub> and the narrowed bandgap of NiTiO<sub>3</sub>, which facilitates the efficient separation of photogenerated electron–hole pairs. The active species involved in the photocatalytic oxidation process were identified as holes and superoxide radicals. A proposed mechanism for the photocatalytic degradation of RhB is presented.</p>

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Facile synthesis of NiTiO3/BiOCl0.75I0.25 composites with enhanced photocatalytic acitivity under low-power visible LED light irradiation

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • Nguyen Thanh Tra,
  • Do Thi Kim Thoa,
  • Nguyen Hoang Thoan,
  • Luong Huu Bac

摘要

A heterojunction photocatalyst NiTiO3/BiOCl0.75I0.25 composite was successfully synthesized using a simple room-temperature coprecipitation method. The fabricated material was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and ultraviolet–Visible diffuse reflectance spectroscopy (UV–Vis DRS). The photocatalyst was evaluated for its ability to degrade Rhodamine B (RhB) in aqueous solution under visible light irradiation. The NiTiO3/BiOCl0.75I0.25 composite exhibited significantly enhanced photocatalytic performance compared to pure BiOCl0.75I0.25 and NiTiO3. Among the prepared samples, the 20 wt% NiTiO3/BiOCl0.75I0.25 heterojunction demonstrated the highest photocatalytic activity for RhB degradation under visible light with gradation rate was 3 times faster than that of pure BiOCl0.75I0.25. After 30 min of irradiation with a 50 W white LED, degradation efficiency was reached a value of 99%. The improved photocatalytic degradation is attributed to the synergistic effect between the large BiOCl0.75I0.25 and the narrowed bandgap of NiTiO3, which facilitates the efficient separation of photogenerated electron–hole pairs. The active species involved in the photocatalytic oxidation process were identified as holes and superoxide radicals. A proposed mechanism for the photocatalytic degradation of RhB is presented.