| TiO2光催化氧化苯酚动力学研究 |
| 摘要点击 1389 全文点击 3297 投稿时间：1997-01-08 |
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| 中文关键词 多相光催化降解 动力学 苯酚 TiO2 催化氧化 光解速率 |
| 英文关键词 photocatalytic kinetics phenol TiO2 photocatalytic oxidation |
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| 中文摘要 |
| 以中压汞灯为光源,研究了苯酚在TiO2水悬浮液中的降解动力学。考察了苯酚起始浓度、气相氧浓度,催化剂投加量(TiO2)、光强度以及催化剂煅烧温度对苯酚光解速率的影响。揭示了苯酚多相光催化氧化反应的特点,反应过程符合表观一级动力学规律,气相氧的影响为一级,苯酚初始浓度的影响为负一级。在一定光强度下,催化剂的投加量存在一最佳值。说明有效光强度、气相氧以及催化剂投加量是光催化氧化反应的关键因素。适当地热处理可提高TiO2的催化活性。建立的动力学公式能综合概括诸因素对反应速度的影响。 |
| 英文摘要 |
| The kinetics of the photo degradation of phenol were studied in TiO2 aqueous suspensions under mercury lamp irradiation. The effects of initial concentration(c0)of phenol, oxygen patial pressure(Po2), light intensity(I), the amountof catalyst and calcination temperature of catalyston photodeg radation of phenol have been investigated. The charact eristics of photo catalytic oxidation of phenol were verified, the reaction apparently proceeded according to the first-order kinetics with the apparent rate constant dependencing on c0, Po2, I and [TiO2]. Photo catalytic activity can be improved by suitable calcination. The experimental results indicates that the oxygen patial pressure, light intensity and dose of catalysts were important parameters in the deg radation process. A chemical kinetic equation was proposed, which could be in agreement with experimental results. |
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