Abstract A BiOCl-Bi12O17Cl2 nanocomposite with a high visible-light response and a low photoinduced electron-hole pair recombination rate was successfully synthesized using an ultrasonic-hydrothermal method. The texture, structure, optical, and photocatalytic properties of the composite were characterized. The results showed that the composite had a sheet flower-like structure with a large specific surface area. Ultraviolet-visible diffuse reflection spectra and photoluminescence spectra showed that the composite had an excellent visible-light response and a low recombination rate of photoinduced electron hole pairs. The photocatalytic property of the composite was evaluated by the removal efficiency of rhodamine B and ciprofloxacin under visible-light illumination. The composite's reaction rate constant of removing rhodamine B (/ciprofloxacin) was approximately 8.14 (/4.94), 42.63 (/11.91) and 64.66 (/36.07) times that of Bi12O17Cl2, P25, and BiOCl, respectively. Furthermore, the composite showed a wide applicable pH range and excellent reusability. Mechanism analysis showed that photogenerated holes played a dominant role and ·O2− also contributed to photocatalytic degradation. In summary, this study presents a high-efficiency photocatalyst for wastewater treatment.

中文翻译：

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超声水热法制备具有高可见光光催化活性的BiOCl-Bi12O17Cl2纳米复合材料去除染料和药物

摘要 采用超声-水热法成功合成了具有高可见光响应和低光致电子-空穴对复合率的BiOCl-Bi12O17Cl2纳米复合材料。表征了复合材料的织构、结构、光学和光催化性能。结果表明，复合材料具有片状花状结构，具有较大的比表面积。紫外-可见漫反射光谱和光致发光光谱表明复合材料具有优异的可见光响应和低光生电子空穴对复合率。通过在可见光照射下对罗丹明B和环丙沙星的去除效率来评估复合材料的光催化性能。复合体' 去除罗丹明 B (/环丙沙星) 的反应速率常数分别约为 Bi12O17Cl2、P25 和 BiOCl 的 8.14 (/4.94)、42.63 (/11.91) 和 64.66 (/36.07) 倍。此外，该复合材料显示出广泛的适用 pH 范围和出色的可重复使用性。机理分析表明，光生空穴起主导作用，·O2-也有助于光催化降解。总之，本研究提出了一种用于废水处理的高效光催化剂。