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Effects of hydrothermal temperature and acid concentration on the transition from titanate to titania
- Effects of hydrothermal temperature and acid concentration on the transition from titanate to titania
- Kim, Soonhyun; Kim, Minsun; Hwang, Sung-Ho; Lim, Sang Kyoo
- DGIST Authors
- Kim, Soonhyun; Hwang, Sung-Ho; Lim, Sang Kyoo
- Issue Date
- Journal of Industrial and Engineering Chemistry, 18(3), 1141-1148
- Article Type
- Acid Concentrations; Acid Treated; Anatase Particles; Crystalline Phase; High Concentration; High Crystallinity; Hydrothermal; Hydrothermal Processing; Hydrothermal Temperature; Low Concentrations; Nano-Structured; Nano-Structures; Nanofibers; Nanostructure; Oxide Minerals; Phase Transformation; Phase Transitions; Photo-Catalytic; Photo-Catalytic Activities; Photocatalysis; Titanate Nanofiber; Titanate Nanotubes; Titanates; Titania; Titanium Dioxide
- Nanostructured titanates were prepared by alkaline hydrothermal processing. The titanates were transformed to the anatase particles at low concentrations of acid, whereas the rutile rods were produced from the titanates at high concentrations of acid. These changes were more retarded in the titanate nanofiber product than in titanate nanotubes product, which could be attributed to the stability and high crystallinity of the titanate nanofiber product prepared at a high hydrothermal temperature. The photocatalytic activities of the acid treated nanostructured titanates for MB degradation and gaseous CH 3CHO oxidation were strongly dependent on the presence of the anatase crystalline phase. © 2012 The Korean Society of Industrial and Engineering Chemistry.
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