| 纳米TiO2光催化剂的活性与使用寿命 |
| Photo-Catalytic Activity and Life Time of the TiO2 Nano-Particles |
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| 摘要: |
| 关键词: 二氧化钛 催化活性 使用寿命 |
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| Abstract: Titanium dioxide nano-particles (for example， P25， Germany， Degussa) have been internationally used as an effective photo-catalyst for many years. In this paper， characterization of P25， photo-degradation ability as well as its life time has been systematically studied by employing methyl orange as a model pollutant. Many factors such as the pH value， pre-treatment have been investigated. Just like other nanometer-sized or ordinary Anatase TiO2， the catalyst performs better at an optimal pH value. Pre-treatment of the catalyst also enhances the photo-catalytic a-bility. And the P25 have shown rather good life time. The degradation products have been characterized by UV， mass and Raman spectrum. It is found that although the P25 photo-catalyst has shown excellent decolourization a-bility， it is still difficult to degrade the methyl orange into small molecule， such as CO2 and H2O. Low-power ul-traviolet lamps (9W， 254nm) have been used throughout. A comparison experiment has been carried out under natural sunlight， and the results have shown that natural sunlight (With temperature below 10℃) could provide even more energy than that of the adopted ultraviolet lamp， which have proved P25 a rather promising photo-catalyst for practical application in environment field under natural surrounding. The obtained results may serve as a valuable reference for the evaluation and preparation of high quality TiO2 photo-catalyst. |
| Keywords: titanium dioxide photo-catalytic activity life time of P25 |
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| 樊钦平,王训,李亚栋.纳米TiO2光催化剂的活性与使用寿命[J].无机化学学报,2003,19(5):521-526. |
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