掺Fe^(3+)纳米TiO_2晶体结构及光催化性能研究

Research on the Crystal Structure and Photocatalytic Activity of Fe^(3+)-doped Nanometer TiO_2

采用溶胶-凝胶法制备了纯的和Fe3+掺杂的TiO2纳米粒子,对样品进行了XRD分析,并以甲基橙的光催化降解研究了样品的光催化性能。结果发现Fe3+的掺杂抑制了TiO2粒径的长大,细化了晶粒;Fe3+掺入到TiO2的晶格中,引起了晶格的畸变和膨胀;Fe3+的掺杂促进了TiO2由锐钛矿向金红石的转变;Fe3+的掺杂量和煅烧温度对其光催化性能影响较大,在本实验的条件下,Fe3+的最佳掺杂量为0.05%,最佳煅烧温度为600℃。

The pure and Fe^3＋ -doped TiO2 nanoparticles were prepared by sol-gel method and characterized with X-ray diffraction （XRD）, and their photocatalytic activity were studied by photocatalytic oxidation of methyl orange. It is found that Fe^3 ＋ doping restrains crystal size increasing. Fe^3＋ ions enter into the crystal lattice of TiO2 to lead to matrix distortion and lattice expansion. The transformation of crystalline form anatase to rutile is promoted because of Fe^3＋ doping. Fe^3＋ doped concentration and the calcined temperature play important roles on the photocatalytic activity of TiO2. In this experimental condition, the optimal doped concentration is 0.05% and the optimal calcined temperature is 600℃.