The present study examined the effects of adding bismuth oxyhalides, BiOCl, BiOBr and BiOI, on the photocatalytic properties of Bi 2 WO 6 . The samples were synthesized using a simple one-stage hydrothermal method. The samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), diffused reflectance spectroscopy (DRS) and the nitrogen absorption/desorption technique. The activity of the products on the photocatalytic degradation of an aqueous Rhodamine B (RhB) solution was then investigated under visible light irradiation. The results showed the higher photocatalytic efficiency of the hybrid Bi 2 WO 6 /BiOBr sample compared to that of other compounds, as approximately 97% of RhB molecules were degraded after 80 minutes of irradiation in the presence of this sample. Under the same conditions, pure Bi 2 WO 6 and hybrid samples of Bi 2 WO 6 /BiOCl and Bi 2 WO 6 /BiOI, respectively, degraded 40%, 60% and 20% of dye molecules in the solution. The better performance of this sample compared to that of the others can be explained by its larger effective surface area and the strong interaction between Bi 2 WO 6 and BiOBr. Furthermore, a test conducted to determine active species in photocatalytic reactions showed that superoxide radicals played the main role in the degradation of RhB molecules by hybrid Bi 2 WO 6 /BiOBr photocatalyst.

中文翻译：

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Bi2WO6/BiOX(X=Cl, Br, I)复合材料的合成及光催化降解RhB可见光

本研究考察了添加卤氧化铋、BiOCl、BiOBr 和 BiOI 对 Bi 2 WO 6 光催化性能的影响。使用简单的一步水热法合成样品。使用 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、漫反射光谱 (DRS) 和氮吸收/解吸技术对样品进行表征。然后在可见光照射下研究产物对罗丹明 B (RhB) 水溶液的光催化降解的活性。结果表明，与其他化合物相比，混合 Bi 2 WO 6 /BiOBr 样品的光催化效率更高，因为在该样品存在的情况下，大约 97% 的 RhB 分子在照射 80 分钟后降解。在同等条件下，纯Bi 2 WO 6 和Bi 2 WO 6 /BiOCl和Bi 2 WO 6 /BiOI的混合样品分别降解了溶液中40%、60%和20%的染料分子。该样品与其他样品相比具有更好的性能可以通过其更大的有效表面积和 Bi 2 WO 6 和 BiOBr 之间的强相互作用来解释。此外，为确定光催化反应中的活性物种而进行的测试表明，超氧自由基在混合 Bi 2 WO 6 /BiOBr 光催化剂降解 RhB 分子中起主要作用。