Synthesis of nanotube from a layered H₂Ti₄O₉ · H₂O in a hydrothermal treatment using various titania sources

Author： Nakahira A. Kato W. Tamai M. Isshiki T. Nishio K. Aritani H.

ISSN： 0022-2461

Source： Journal of Materials Science, Vol.39, Iss.13, 2004-07, pp. : 4239-4245

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Abstract

In this paper, the synthesis of tubular titania was carried out through a soft chemical hydrothermal reaction of TiO₂ powders in NaOH or KOH aqueous solution systems. It was found that nanotubular products prepared in our studies were identified as H₂Ti₄O₉·H₂O by X-ray diffraction analysis with their morphology and crystallinity being dependent on synthetic conditions, i.e. reaction time and temperature of the hydrothermal process. The photocatalytic activity of nanotubular H₂Ti₄O₉·H₂O was evaluated in a decomposition test of HCHO at 298 K in an aqueous system using radiation with a mercury lamp. The morphology and yield of these nanotubular products were found to be dependent on the hydrothermal synthetic conditions.