光催化
热液循环
二氧化钛
材料科学
化学工程
水热合成
纳米技术
化学
冶金
催化作用
有机化学
工程类
作者
Yu-Zhen Zeng,Yu-Chang Liu,Yun-Fang Lu,Jen-Chieh Chung
出处
期刊:International Journal of Chemical Engineering and Applications
[EJournal Publishing]
日期:2014-06-01
卷期号:5 (3): 234-239
标识
DOI:10.7763/ijcea.2014.v5.385
摘要
In this study, we attempt to synthesize nanosized titanium dioxide with tubular structure for the photocatalytic applications, and self-prepared anatase TiO2 powder is the precursor. We demonstrated that nanosized TiO2 with tubular structure could be synthesized with a NaOH hydrothermal treatment on TiO2 powder and then with a subsequent acid washing. Furthermore different formation mechanism of nanotubes could be got by controlling the pH value of acid washing step. In this research, we investigate the influence of different pH values of acid washing on the crystalline-structure, optical absorption range, porosity, specific surface area, and photo-catalytic activity of nanotubes. The influence of the preparation methods on crystalline-structure of photocatalysts and activities of photocatalytic reaction are obvious. The experimental results show that anatase TiO2 nanotubes are produced as the pH value of acid washing is decreased to 1.3. Under this condition, the outer diameter and length of the nanotube is about 10 nm and 1μm respectively, its group is like petals. And it possesses the largest surface area of 381.2 m 2 /g, band gap of 3.12eV and the best photocatalytic activity.
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