Effects of particle size of TiO{sub 2} on photocatalytic degradation of methylene blue in aqueous suspensions
- Nanjing Univ. of Chemical Technology (China). Membrane Science and Technology Research Center
- Oak Ridge National Lab., TN (United States). Chemical Technology Div.
The influence of particle size of TiO{sub 2} on the photocatalytic degradation of methylene blue (MB) in a suspended aqueous solution has been studied. The results suggested that the adsorption rate and adsorbability of MB on suspended TiO{sub 2} particles increased as the particle sizes of TiO{sub 2} decreased. Photocatalytic activity of TiO{sub 2} also increased as the particle size of TiO{sub 2} became smaller, especially when the particle size is less than 30 nm. The half-life (t{sub 0.5}) of the photocatalytic degradation of MB also decreased as the particle sizes of TiO{sub 2} decreased. The first-order reaction rate constant for photodegradation of MB increased as the particle size of TiO{sub 2} decreased. The initial degradation rate of MB in a suspended model was higher than that of a fixed-bed model. This will overcome the difficulty of preparation of ultrafine TiO{sub 2} catalyst particles. Once the problem of separation of fine TiO{sub 2} particles is solved, a TiO{sub 2} suspended photoreactor could be provided on an industrial basis.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- OSTI ID:
- 329253
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 38, Issue 2; Other Information: PBD: Feb 1999
- Country of Publication:
- United States
- Language:
- English
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