Department of Chemical Engineering, Universiti Teknologi Petronas, Bandar Seri Iskandar, 31750 Tronoh, Perak D.R., Malaysia.
J Hazard Mater. 2010 Apr 15;176(1-3):451-8. doi: 10.1016/j.jhazmat.2009.11.050. Epub 2009 Nov 13.
Tungsten-loaded TiO(2) photocatalyst has been successfully prepared and characterized. TEM analysis showed that the photocatalysts were nanosize with the tungsten species forming layers of coverage on the surface of TiO(2), but not in clustered form. This was confirmed by XRD and FT-Raman analyses where tungsten species were well dispersed at lower loading (<6.5 mol%), but were in crystalline WO(3) at higher loadings (>12 mol%). In addition, loading with tungsten could stabilize the anatase phase from transforming into inactive rutile phase and did not shift the optical absorption to the visible region as shown by DRUV-vis analysis. PZC value of TiO(2) was found at 6.4, but the presence of tungsten at 6.5 mol% WO(3), decreased the PZC value to 3. Tungsten-loaded TiO(2) was superior to unmodified TiO(2) with 2-fold increase in degradation rate of methylene blue, and equally effective for the degradation of different class of dyes such as methyl violet and methyl orange at 1 mol% WO(3) loading.
担载钨的 TiO(2)光催化剂已成功制备并进行了表征。TEM 分析表明，光催化剂为纳米尺寸，钨物种在 TiO(2)表面形成覆盖层，但不是团聚形式。这通过 XRD 和 FT-Raman 分析得到了证实，其中钨物种在较低负载量（<6.5 mol%）下得到了很好的分散，但在较高负载量（>12 mol%）下则形成了结晶 WO(3)。此外，担载钨可以稳定锐钛矿相，防止其向无活性的金红石相转化，而且如 DRUV-vis 分析所示，它不会将光吸收转移到可见光区域。TiO(2)的 PZC 值为 6.4，但在 6.5 mol% WO(3)的存在下，PZC 值降低至 3。担载钨的 TiO(2)比未改性的 TiO(2)具有更高的亚甲基蓝降解率，在 1 mol% WO(3)负载量下，对不同类型的染料如甲基紫和甲基橙的降解也同样有效。
