photocatalytic properties of size-controlled titania nanotube arrays
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ID: 144995
2011
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Abstract
The titania nanotube arrays (TNAs) with smooth surface was synthesized by anodization of titanium foil with 3 cm2 in square area using the electrolyte composed of 0.2 wt% NH4F and 0.5 vol% H2SO4 in ethylene glycol in order to evaluate the methylene blue photodegradation under ultra-violet irradiation. The tube length and inner diameter as a size parameter were controlled by the anodization time from 5 to 10 h and applied voltage from 10 to 50 V. The titania nanotube arrays (TNAs) annealed at 300 to 500°C were assigned to anatase phase, and TNAs at 600°C had both phase of anatase and rutile. The crystallite size and the apparent rate constant were increased with the increase in the annealing temperature of TNAs from 300 to 500°C. The bigger crystallite size of TNAs is suggested to be related to the increase in the amount of hole at the valence band, leading to the decrease in the apparent rate constant of MB degradation. Interestingly, the four kinds of linear relationship with the apparent rate constant were seen in both the inner diameter of TNAs and the length. Consequently, the apparent rate constant strongly depended on inner diameter of TNAs.
| Reference Key |
hashishin2011internationalphotocatalytic
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|---|---|
| Authors | ;Takeshi Hashishin;Keisuke Misawa;Kazuo Kojima;Chihiro Yogi;Jun Tamaki |
| Journal | BMJ open quality |
| Year | 2011 |
| DOI |
10.4061/2011/656939
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