空心球状碘氧化铋的制备及其对染料的吸附降解性能

通过溶剂热法制备出空心球状的碘氧化铋,采用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)和物理吸附仪等技术手段对样品的结构和性能进行了表征。选用阳离子型染料罗丹明B和阴离子型染料活性蓝KN-R来研究BiOI的吸附性能和光催化活性。结果表明,在不同的溶液初始pH值下BiOI对不同结构和类型的染料表现出不同的吸附性和光催化降解性。BiOI对罗丹明B和活性蓝KN-R均有较高的吸附性和降解率,且光催化降解效率可以达到96.2%和92.5%。捕捉实验表明,h+在光催化降解中起主要作用。

Preparation of Hollow Spherical Bismuth Oxyiodide and Its Adsorption and Photocatalytic Degradation of Dyes

Hollow spherical bismuth oxyiodide(BiOI) was synthesized via the solvothermal method. The as-prepared BiOI was well characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM) and N₂ adsorption-desorption analysis. Two different types of dyes, such as cationic rhodamine B(RhB) and anionic reactive blue KN-R, were selected to evaluate the adsorption and photocatalytic activity of BiOI. The results show that the initial pH values have great effect on the adsorption and degradability of different types of dyes. The degradation efficiency of RhB and KN-R reaches 96.2% and 92.5%, respectively. The active species trap experiments reveal that h⁺ is the dominant specie for the degradation of dyes.