Advanced Materials and Nano-Research Centre, Najran University, P.O. Box: 1988, Najran 11001, Saudi Arabia; Central Metallurgical Research and Development Institute (CMRDI), P.O. Box: 87 Helwan, Cairo 11421, Egypt.
Advanced Materials and Nano-Research Centre, Najran University, P.O. Box: 1988, Najran 11001, Saudi Arabia.
J Colloid Interface Sci. 2016 Jun 1;471:145-154. doi: 10.1016/j.jcis.2016.03.019. Epub 2016 Mar 12.
Mesoporous sulfur (S)-doped Ta2O5 nanocomposites have been synthesized for the first time through the sol-gel reaction of tantalum chloride and thiourea in the presence of a F127 triblock copolymer as structure directing agent. The as-formed mesophase S-doped Ta2O5 hybrid gels were calcined at 700°C for 4h to obtain mesoporous S-Ta2O5 nanocomposites. The experimental results indicated that the surface area of the S-doped Ta2O5 was up to 50m(2)g(-1) and the pore diameter was controllable in the range of 3-7.7nm. The S-doped Ta2O5 nanocomposites behave as superior visible light-sensitive photocatalysts and the 1.5at.% S-doped Ta2O5 (S1.5) photocatalyst exhibited excellent photocatalytic activity of ∼92% for the photodegradation of methylene blue, identical to 80% TOC removal after three hours illumination under visible light. The photodegradation rate of S1.5 photocatalyst showed 3.4 times higher than the undoped Ta2O5 due to their narrow bandgap, large surface area, mesostructure and well crystalline state. The S1.5 photocatalyst could be recycled at least five times without an apparent decrease in its photocatalytic efficiency, indicating its high stability for practical applications. To the best of our knowledge, this is the first report that demonstrates one-step synthesis of mesoporous S-doped Ta2O5 nanocomposites as an efficient photocatalysts under visible light illumination.
首次通过在 F127 三嵌段共聚物存在下，氯化钽和硫脲的溶胶-凝胶反应合成了介孔硫（S）掺杂 Ta2O5 纳米复合材料。形成的介孔相 S 掺杂 Ta2O5 杂化凝胶在 700°C 下煅烧 4h 以获得介孔 S-Ta2O5 纳米复合材料。实验结果表明，S 掺杂 Ta2O5 的比表面积高达 50m2/g，孔径可在 3-7.7nm 的范围内控制。S 掺杂 Ta2O5 纳米复合材料表现出优异的可见光敏光催化剂性能，1.5at.% S 掺杂 Ta2O5（S1.5）光催化剂在可见光照射 3 小时后对亚甲基蓝的光降解率约为 92%，TOC 去除率为 80%。由于其窄带隙、大比表面积、介孔结构和良好的结晶状态，S1.5 光催化剂的光降解速率比未掺杂的 Ta2O5 高 3.4 倍。S1.5 光催化剂至少可回收五次而其光催化效率无明显下降，表明其在实际应用中具有高稳定性。据我们所知，这是首次报道在可见光照射下一步合成高效可见光催化剂介孔 S 掺杂 Ta2O5 纳米复合材料。
