Microemulsion-mediated hydrothermal synthesis of photocatalytic TiO2 powders

JOURNAL OF HAZARDOUS MATERIALS

卷:154

Article

Lu, Chung-Hsin¹  Wu, Wei-Hong¹  Kale, Rohidas B.¹ 

[1] Natl Taiwan Univ, Dept Chem Engn, Taipei 10764, Taiwan

关键词: titanium dioxide;    microemulsion;    hydrothermal method;    photocatalytic activity;   

DOI  :  10.1016/j.jhazmat.2007.10.074

来源: Elsevier

【 摘 要 】

A reverse microemulsion-mediated hydrothermall route has been employed to synthesize photocatalytic titanium dioxide (TiO2) powders. Nanocrystalline monophasic anatase TiO2 powders were successfully prepared when the microemulsion-derived precursors were hydrothermally treated. The advantage of using this microemulsion mediated hydrothermal route is the significant reduction in reaction time and temperatures as compared with the conventional hydrothermal process. The oil/water emulsion ratio significantly affected the particle sizes of the obtained TiO2 powders. The specific surface area of TiO2 powders was increased with the oil/water ratio, thereby leading to enhanced photocatalytic activity of TiO2 powders. As the hydrothermal. temperature was elevated, the morphology of the TiO2 particles changed from a rod-like shape into a polyhedral shape. The variation in microstructures decreased the specific surface area of the TiO2 powders and lowered the photocatalytic activity. (c) 2007 Elsevier B.V. All rights reserved.

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