Advanced Materials Department, Central Metallurgical R& D Institute, CMRDI, P.O. Box 87, Helwan 11421 Cairo, Egypt; Advanced Materials and Nano Research Center, Najran University, P.O. Box 1988, Najran 11001, Saudi Arabia.
Water Pollution Research Dept., National Research Centre, 33 EL Bohouth St. (Former EL Tahrir St.), P.O. 12622, Dokki, Giza, Egypt.
J Hazard Mater. 2016 Apr 15;307:43-54. doi: 10.1016/j.jhazmat.2015.12.041. Epub 2015 Dec 28.
Herein, we report the ease synthesis of mesoporous WO3-TiO2 nanocomposites at different WO3 contents (0-5wt%) together with their photocatalytic performance for the degradation of the imazapyr herbicide under visible light and UV illumination. XRD and Raman spectra indicated that the highly crystalline anatase TiO2 phase and monoclinic and triclinic of WO3 were formed. The mesoporous TiO2 exhibits large pore volumes of 0.267cm(3)g-1 and high surface areas of 180m(2)g(-1) but they become reduced to 0.221cm(3)g(-1) and 113m(2)g(-1), respectively upon WO3 incorporation, with tunable mesopore diameter in the range of 5-6.5nm. TEM images show WO3-TiO2 nanocomposites are quite uniform with 10-15nm of TiO2 and 5-10nm of WO3 sizes. Under UV illumination, the overall photocatalytic efficiency of the 3% WO3-TiO2 nanocomposite is 3.5 and 6.6 times higher than that of mesoporous TiO2 and commercial UV-100 photocatalyst, respectively. The 3% WO3-TiO2 nanocomposite is considered to be the optimum photocatalyst which is able to degrade completely (100% conversion) of imazapyr herbicide along 120min with high photonic efficiency ∼8%. While under visible light illumination, the 0.5% WO3-TiO2 nanocomposite is the optimum photocatalyst which achieves 46% photocatalytic efficiency.
在此，我们报告了在不同 WO3 含量（0-5wt%）下轻松合成介孔 WO3-TiO2 纳米复合材料，以及它们在可见光和紫外光照射下对咪唑烟酸除草剂降解的光催化性能。XRD 和拉曼光谱表明，形成了高度结晶的锐钛矿 TiO2 相和单斜相和三斜相的 WO3。介孔 TiO2 具有 0.267cm(3)g-1 的大孔体积和 180m(2)g(-1)的高比表面积，但在掺入 WO3 后分别减少到 0.221cm(3)g(-1)和 113m(2)g(-1)，可调介孔直径在 5-6.5nm 范围内。TEM 图像显示 WO3-TiO2 纳米复合材料非常均匀，TiO2 尺寸为 10-15nm，WO3 尺寸为 5-10nm。在紫外光照射下，3% WO3-TiO2 纳米复合材料的整体光催化效率分别比介孔 TiO2 和商业 UV-100 光催化剂高 3.5 和 6.6 倍。3% WO3-TiO2 纳米复合材料被认为是最佳光催化剂，能够在 120min 内完全降解（转化率为 100%）咪唑烟酸除草剂，光子效率高达 8%左右。而在可见光照射下，0.5% WO3-TiO2 纳米复合材料是最佳光催化剂，其光催化效率达到 46%。
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