单质碘掺杂纳米TiO₂光催化剂的制备及性能

单质碘掺杂纳米TiO 2 光催化剂的制备及性能 Preparation and Photocatalytic Properties of Nano-TiO 2 Doped with I 2 杨陈 YANG Chen 1 first-author 杨昌军 YANG Changjun 1 法文君 FA Wenjun 1 龚楚清 Gong Chuqing 1 彭天右 PENG Tianyou 1 昝菱 ZAN Ling 1 武汉大学化学与分子科学学院 武汉大学化学与分子科学学院 College of Chemistry and Molecular Sciences,Wuhan University College of Chemistry and Molecular Sciences,Wuhan University 以钛酸四异丙酯和单质碘为起始原料,用改进的溶胶-凝胶法制备了掺碘的纳米TiO2的前驱体,经500℃煅烧得到棕黄色TiO2/I2纳米粉末.采用X射线衍射（XRD）,紫外-可见（UV-Vis）漫反射光谱,透射电镜（TEM）等手段对TiO2/I2粉末进行了表征,并研究了其光催化性能.结果表明,掺杂的碘存在于TiO2内部纳米孔洞中,不会因为高温而被氧化;光催化降解甲基橙反应是一级反应;TiO2掺杂碘单质后对光响应波长拓展至可见光范围,对甲基橙的降解效率可提高15%以上. A yellow/brown powder of Nanometer TiO2 doped with I2 was obtained via an improved sol-gel route with Ti（OC3H7）4 and iodine as raw material after being calcined at 500 ℃.The analysis of the powder was performed by X-ray diffraction（XRD）,UV-Vis Absorption spectra,and transmission electron microscopy（TEM）.The photocatalytic degradation of methyl orange was carried out in which TiO2 acted as a photocatalyst.The results indicate that iodine can exist even in high temperature calcination for iodine being encapsulated in the nanocavities inside TiO2.The degradation of methyl orange accorded with the first-order reaction model.Moreover,the way of iodine doping not only extended the Absorption spectra of TiO2,but also enhanced the decoloration rate of methyl orange by about 15%. 单质碘掺杂 纳米TiO2 光催化降解 I2-doped nano-TiO2 photocatalytic degradation O643.32 国家自然科学基金资助项目（20673078） 2008-06-01 2021-04-01 6 54