掺碘二氧化钛薄膜自组装制备、表征及光催化性能

通过自组装技术在低温液相反应体系中制备出大尺寸纳米二氧化钛及其掺碘薄膜。使用XRD、TEM、荧光发射光谱仪、激光拉曼光谱仪等手段对样品进行表征，发现掺I^5＋后的二氧化钛薄膜在可见光区也表现出明显的响应，而且合成的I^5＋／TiO2纳米薄膜在TEMggNT其晶型显示为金红石型，并且碘掺杂后样品的拉曼光谱强度减弱，峰位蓝移且宽化。掺杂I^5＋原溶液浓度为2mmol／L时，其可见光下光催化效果最优，5h后降解率可达到95％，较未掺杂的TiO2纳米薄膜提高了40％，I^5＋掺杂明显提高了TiO2对甲基橙溶液的光催化降解效率。

Preparation,characterization and photocatalytic activity of iodine-doped nano-titania thin films based on self-assembled mololayers

Large-size two-dimensional nano-titania and iodine-doped nano-titania thin films were prepared in low-temperature aqueous system by using molecular self-assembly method. Samples were characterized with XRD, TEM, fluorescence emission spectrometer and Raman testing techniques , Fluorescence emission spectrum indicated that I⁵⁺/TiO₂ thin film presented a significant response to visible light. TEM had showed that this method could prepare rutile titania film, and the intensity of Raman spectrum decreased accompanying with blue shift of the peak. As the concentration of iodine ion decreased to 2 mmol/L the photocatalytic activity reached the maximum. And the degradation efficiency of methyl orange was up to 95%, which was 40% more than undoped titania thin film. The doped iodine could obviously improve the degradation efficiency