Department of Solid State Chemistry, Institute of Inorganic Chemistry AS CR v.v.i. , 250 68 Řež, Czech Republic.
ACS Appl Mater Interfaces. 2011 Oct;3(10):4014-23. doi: 10.1021/am2008757. Epub 2011 Oct 7.
Tungsten-doped anatase was prepared by a thermal hydrolysis of aqueous solutions of peroxo complexes of titanium and tungsten. The synthesized samples included X-ray diffraction, high-resolution transmission electron microscopy, selected area electron diffraction, Raman spectroscopy, specific surface area, and porosity determination. W doping resulted in a decrease of the unit-cell volume of anatase at lower W contents and an increase at higher W contents. The position of the most intense Raman band of the E(g) mode (near 147 cm(-1)) also has a local minimum at medium-doped titania (1.1-3.6% W in titania). W doping increases the temperature of anatase-to-rutile transformation by about 100 °C compared with nondoped anatase. The photocatalytic activity of doped titania samples was determined by decomposition of Orange II dye during irradiation at 365 and 400 nm. Specimens with moderate W doping (1.0-3.3% W) perform best: they enhance the corresponding reaction rates 10 times at 365 nm and 5 times at 400 nm, respectively, compared with pure titania obtained under the same set of synthesis conditions.
掺钨锐钛矿通过钛钨过氧配合物水溶液的热水解制备而成。合成的样品包括 X 射线衍射、高分辨率透射电子显微镜、选区电子衍射、拉曼光谱、比表面积和孔隙率测定。W 掺杂在较低的 W 含量下导致锐钛矿的晶胞体积减小，而在较高的 W 含量下则增加。E(g)模式（在 147 cm(-1)附近）最强拉曼带的位置在中掺杂的 TiO2（TiO2 中 1.1-3.6%的 W）中也有局部最小值。与未掺杂的锐钛矿相比，W 掺杂将锐钛矿向金红石的转变温度提高了约 100°C。通过在 365nm 和 400nm 照射下橙 II 染料的分解来测定掺杂 TiO2 样品的光催化活性。具有适度 W 掺杂（1.0-3.3%W）的样品表现最佳：与在相同合成条件下获得的纯 TiO2 相比，它们在 365nm 下分别将相应的反应速率提高了 10 倍，在 400nm 下提高了 5 倍。
