Preparation of TiO2 fibers by two-step synthesis method and their photocatalytic activity☆
Preparation of TiO2 fibers by two-step synthesis method and their photocatalytic activity☆
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DOI：
10.1016/j.matchemphys.2007.06.066
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发表时间：
2008-01
影响因子：
4.6
通讯作者：
Shiying Zhang;Shiying Zhang;Zhenhua Chen;Yunlong Li;Qun Wang;L. Wan;Y. You
中科院分区：
文献类型：
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作者：
Shiying Zhang;Shiying Zhang;Zhenhua Chen;Yunlong Li;Qun Wang;L. Wan;Y. You
采用两步合成法制备了TiO 2纤维：首先以钛酸四丁酯为前驱体，采用溶胶-细乳液-凝胶法制备TiO 2粉体;然后以未经热处理的合成TiO 2粉体为原料，在NaOH溶液中回流制备TiO 2纤维。采用SEM、TEM、XRD、BET、EDS等手段对TiO 2纤维进行了表征。通过光催化降解亚甲基蓝评价了样品的光催化活性。结果表明，在10 molL-1的NaOH溶液中回流，然后在450°C下热处理2 h，可以有效地制备出具有长径比约为200的网状结构的TiO 2纤维。其中，商品P25、自制的TiO 2粉末和不同温度热处理的TiO 2纤维催化剂由于具有较高的比表面积和最佳的晶相而表现出最高的光催化活性。
The TiO2fibers were prepared by two-step synthesis method: first using tetrabutyltitanate as precursor materials, TiO2powder was prepared by sol–miniemulsion–gel method, and secondly using synthetic TiO2powder without heat treatment as raw materials, the TiO2fibers were prepared by reflux in NaOH solution. The TiO2fibers were characterized by SEM, TEM, XRD, BET and EDS. The photocatalytic activity of samples was evaluated by photocatalytic degradation of methylene blue. The results indicate that when TiO2powder is refluxed in NaOH solution with content of 10molL−1and subsequently been heat treatment at 450°C for 2h, the TiO2fibers are effectively obtained and show high surface areas due to their meshy holes of intertextural structure with rate of length to diameter being about 200. Among catalysts include commercial P25, self-made TiO2powder and TiO2fibers with heat treatment at different temperature, they show the highest photocatalytic activity due to high surface areas and optimum crystalline phase.