硫掺杂钨酸铋材料的制备及其光催化性能研究

Preparation of Sulfur-Doped Bismuth Tungstate and Their Photocatalytic Performance

摘要: 采用水热法制备得到硫掺杂的钨酸铋材料，并通过调控原料中硫脲的量实现不同量的硫掺杂。利用X射线衍射(XRD)、扫描电镜(SEM)、紫外可见漫反射(DRS)、傅立叶变换红外光谱仪(FT-IR)和荧光分光光度计(PL)对所制备材料进行表征。结果表明硫掺杂没有改变材料的晶型和结构，同时在硫掺杂之后，材料中载流子的分离效率和浓度得到明显的提高。以双酚A作为降解底物，发现经过硫掺杂后钨酸铋材料的光催化性能得到明显提升。其中5%掺杂量的钨酸铋表现出最高的降解活性，与纯相钨酸铋相比活性提高2.7倍。结合捕获剂实验，发现该催化体系主要由•O₂−主导。

Abstract: Sulfur doped bismuth tungstate materials were prepared by hydrothermal method, and different amounts of doping were achieved by adjusting the amount of thiourea in the raw materials. The prepared materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible diffuse reflectance (DRS), Fourier transform infrared spectrometer (FT-IR) and fluorescence spectrophotometer (PL). The results show that after sulfur doping, the separation efficiency and concentration of carriers in the material are significantly improved. Bisphenol A was used as the target pollutant; the photocatalytic performance of the bismuth tungstate material after sulfur doping has been significantly improved. The 5% doping amount of bismuth tungstate exhibited the highest degradation activity, and the activity was 2.7 times higher than the bismuth tungstate. Through trapping agent experiments, it was found that this degradation reaction is dominated by •O₂−.