Abstract—In this study, we attempt to synthesize nanosized titanium dioxide with tubular structure for the photocatalytic applications, and self-prepared anatase TiO
2 powder is the precursor. We demonstrated that nanosized TiO
2 with tubular structure could be synthesized with a NaOH hydrothermal treatment on TiO
2 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 TiO
2 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.
Index Terms—Anatase, hydrothermal method, photocatalytic activity, titanium dioxide nanotube.
The authors are with the Chemical Engineering Division, Institute of Nuclear Energy Research, Taoyuan County 32546, Taiwan , R.O.C. (e-mail: yzzeng@iner.gov.tw, eddyliu@iner.gov.tw, yflu@iner.gov.tw, yflu@iner.gov.tw ).
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Cite:Yu-Zhen Zeng, Yu-Chang Liu, Yun-Fang Lu, and Jen-Chieh Chung, "Study on the Preparation of Nanosized Titanium Dioxide with Tubular Structure by Hydrothermal Method and Their Photocatalytic Activity," International Journal of Chemical Engineering and Applications vol. 5, no. 3 pp. 234-239, 2014.
