BiOI的制备及其光催化性能研究

The study of preparation and photocatalytic property of BiOI

以五水合硝酸铋、碘化钾为原料,乙二醇为溶剂,采取溶剂热法分别在6h、12h和24h下制备了BiOI材料。通过X射线粉末衍射(XRD)、红外光谱(FT-IR)、扫描电子显微镜(SEM)、固相紫外-可见漫反射光谱(UV-vis DRS)和光致发光光谱(PL)等手段对BiOI材料进行了详细的表征。比较了不同反应时间所得BiOI材料在可见光照射下对甲基橙(MO)的降解能力。研究结果表明:反应时间为24h时制备的BiOI具有最好的结晶度、最大的光生电子-空穴对分离率,在590-800 nm范围内对光的吸收最强,其光催化性能最好,光催化反应2.5h后,BiOI对MO的降解率可达83%。

Using bismuth nitrate pentahydrate and potassium iodide as raw materials and ethylene glycol as solvent, BiOI materials were prepared by solvent heating method, respectively at 6 h, 12 h and 24 h. BiOI samples were characterized by Xray powder diffraction(XRD), Fourier transform infrared spectroscopy(FT-IR), scanning electron microscopy(SEM), ultraviolet-visible diffuse reflectance spectroscopy(UV-vis DRS) and photoluminescence spectroscopy(PL). Then the BiOI samples with different reaction times were compared for their ability to degrade methyl orange(MO) under visible light irradiation. The results of research showed that BiOI prepared at a reaction time of 24 h had the best crystallinity, the largest photogenic electronhole pair separation rate, the strongest absorption of light in the range of 590-800 nm, and the best visible light catalytic activity.The degradation rate of BiOI to MO reached 83% after photocatalytic reaction proceeded for 2.5 h.