Low temperature synthesis of iodine-doped TiO2 nanocrystallites with enhanced visible-induced photocatalytic activity
Low temperature synthesis of iodine-doped TiO2 nanocrystallites with enhanced visible-induced photocatalytic activity
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DOI：
10.1016/j.apsusc.2011.01.019
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发表时间：
2011-03
影响因子：
6.7
通讯作者：
Yi Ma;Jipeng Fu;Xia Tao;Xin Li;Jianfeng Chen
中科院分区：
文献类型：
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作者：
Yi Ma;Jipeng Fu;Xia Tao;Xin Li;Jianfeng Chen
采用三嵌段共聚物介导的溶胶-凝胶法在393 K下制备了碘掺杂的TiO 2纳米晶（简称I-TNC）。同时实现了I掺杂、晶化和多孔结构的形成。采用扫描电子显微镜、透射电子显微镜、X射线衍射仪、傅里叶变换红外光谱仪、X射线光电子能谱仪和紫外可见分光光度计对所得粒子进行了表征。结果表明，所制备的I-TNCs的直径约为100 nm。5 nm，具有单晶结构，比表面积超过200 m2 g-1。碘的存在扩大了TiO 2在可见光范围内的光响应，并导致TiO 2表面羟基的富集。与商业光催化剂P25相比，I-TNCs对罗丹明B和2，4-二氯苯酚的光催化降解效率显著提高，且掺杂量为2.5mol%的I-TNCs表现出最佳的光催化活性。
Iodine-doped TiO2nanocrystallites (denoted as I-TNCs) were prepared via a newly developed triblock copolymer-mediated sol–gel method at a temperature of 393K. I-doping, crystallization and the formation of porous structure have been simultaneously achieved. The obtained particles were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and UV–vis spectrophotometer. The results indicated that the as-prepared I-TNCs possessed a diameter of ca. 5nm with anatase crystalline structure and a specific surface area of over 200m2g−1. The presence of iodine expanded the photoresponse in visible light range, and led to enrich in surface hydroxyl group on the TiO2surface. Compared with the commercial photocatalyst P25, the I-TNCs significantly enhanced the photocatalytic efficiency in the degradation of rhodamine B and 2,4-dichlorophenol, and the I-TNCs with 2.5mol% doping ratio exhibited the best photocatalytic activity.