期刊
CRYSTAL RESEARCH AND TECHNOLOGY
卷 47, 期 11, 页码 1190-1194出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/crat.201200290
关键词
titanate; nanotubes; ion exchange; crystallinity; photocatalytic activity
资金
- DGIST R&D Program of the Ministry of Education, Science and Technology of Korea [11-NB-03]
- Ministry of Knowledge Economy, Korea [10034046]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10034046] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Ministry of Education, Science & Technology (MoST), Republic of Korea [11-NB-03] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Titanate nanotubes (TiNTs) were prepared by alkaline hydrothermal processing. The TiNTs are thermodynamically unstable and easily transformed to the titania phase by heat or acid treatment. These phase transformations are affected by the preparation conditions. In this study, we investigated the effects of using the washing process to modify the sodium content of the TiNTs. After an alkaline hydrothermal process was used to prepare the TiNTs, the resulting suspensions were washed with weak acid solution and distilled water until the pH value of the wash solution reached approximately 1 or 7, and the products were identified as H-TiNTs or Na-TiNTs, respectively. The characteristics and photocatalytic activities of the H-TiNTs and Na-TiNTs were compared for various calcination temperatures. The H-TiNTs were transformed completely to anatase-type TiO2 by dehydration during calcination, while the crystallinity of the Na-TiNTs increased with calcination temperature. However, the photocatalytic H-2 production rates on calcined H-TiNTs were much higher than on Na-TiNTs, which could be attributed to the crystalline anatase phase. (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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