| TiO2降解迪美唑的动力学及活性物质分析 |
| 摘要点击 2595 全文点击 1494 投稿时间：2015-03-18 修订日期：2015-06-04 |
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| 中文关键词 迪美唑 抗生素 动力学 光催化 活性物质 |
| 英文关键词 dimetridazole antibiotics kinetics photocatalytic reactive species |
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| 中文摘要 |
| 兽类抗生素迪美唑是一种新兴的污染物质,对环境和人类健康具有潜在危害. 以紫外光为光源,以TiO2为催化剂,对其进行光催化降解,考察了溶液pH值、 TiO2投加量、 溶液的初始浓度等影响因素对迪美唑降解效果的影响. 结果表明,在TiO2投加量为1 g ·L-1,迪美唑初始浓度为40 mg ·L-1,溶液pH为11的最优条件下反应90 min后,迪美唑的去除率为90%,反应速率为0.0257 min-1. 反应符合伪一级动力学模型. 光催化降解迪美唑有两个途径: 一是 ·OH氧化过程,二是e-还原过程. |
| 英文摘要 |
| Dimetridazole is considered as an emerging pollutant in waterbodies, which can potentially impact ecosystem and human health. Heterogeneous photocatalytic decomposition of dimetridazole by TiO2 was investigated under 365 nm UV light and effects of initial pH, TiO2 content and dimetridazole concentration on photocatalytic process were discussed. The results indicated that the optimized experiment condition is that the TiO2 content of 1 g ·L-1, dimetridazole concentration of 40 mg ·L-1, pH of 11, dimetridazole can be removed 90%. The photocatalytic degradation kinetics of dimetridazole could be fitted to the quasi-first-order equation. Photocatalytic degradation of dimetridazole can take place via two pathways: oxidation by ·OH and reduction by e-. |
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