聚乙二醇辅助光化学制备 SnO2及其光催化性能∗

摘要

采用硫酸亚锡作为锡源，加入4种不同分子量的聚乙二醇(PEG)，于低功率紫外光辐照下制备二氧化锡。通过 X 射线衍射(XRD)、扫描电镜(SEM)、傅里叶变换红外光谱(FT-IR)和比表面测试对其结构与形貌进行表征。考察聚乙二醇分子量变化对产物结构和光催化性能的影响。所制备 SnO2的形貌尺寸、比表面积以及其光催化性能与使用 PEG 的分子量密切相关，分子量越大，所制备 SnO2粉体尺寸越小，分布越均匀。以甲基橙为目标降解物进行光催化实验，结果表明，分子量为6000的聚乙二醇诱导制备的二氧化锡在模拟可见光和紫外光照下均显示了较高的催化活性。%Under the low power ultraviolet light irradiation,nanocrystalline SnO2 particles were prepared using stannous sulfate as tin source and polyethylene glycol (PEG)with different molecular weight as the surfactants.The as-synthesized samples were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),Fourier transform infrared spectroscopy (FT-IR)and specific surface area.The effect of PEG molecular weight on product morphology and photocatalytic performance was studied.It was found that the addition of PEG altered morphology, size,specific surface area structure and photocatalytic activities of the SnO2 particles.With PEG molecular weight in-creasing,the particle size decreased,and the surface area increased.The photocatalytic activities were evaluated by degrading the methyl orange solution under the xenon lamp and mercury lamp irradiation.The results showed that the tin oxide from PEG 6000 had higher photocatalytic performance than other SnO2 for degradation of MO.