| 啶虫脒光催化降解动力学的优化及其降解产物的分析 |
| 摘要点击 2154 全文点击 1192 投稿时间：2014-04-10 修订日期：2014-05-21 |
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| 中文关键词 啶虫脒 光催化降解 单因素实验 中心复合实验 降解动力学 |
| 英文关键词 acetamiprid photocatalytic degradation single-variable-at-a-time central composite design degradation kinetics |
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| 中文摘要 |
| 利用光催化技术通过单因素和中心复合实验对啶虫脒的降解动力学进行了研究. 在单因素实验中，探讨了催化剂浓度、底物浓度、温度和pH对其降解动力学的影响. 结果表明啶虫脒光催化降解动力学符合Langmuir-Hinshelwood模型，随着温度的升高和底物浓度的降低其降解速率增加，而弱酸和碱性条件有利于啶虫脒的光催化降解. 中心复合实验通过研究上述4种因素之间的相互关系得到啶虫脒的光催化降解最优条件为：TiO2浓度2.30 g·L-1，底物浓度90.0 μmol·L-1，温度37.5℃，溶液初始pH值为5.0. 最后，HPLC检测到啶脒虫光催化降解产物主要有7个，其中6个降解产物极性大于啶虫脒. |
| 英文摘要 |
| Photocatalytic degradation kinetics of acetamiprid was studied by both of single-variable-at-a-time (SVAT) and central composite design (CCD) experiments based on four factors, such as catalyst dosages, substrate concentration, temperature and pH values. The results indicated that degradation of acetamiprid followed pseudo first-order kinetics by Langmuir-Hinshelwood model, increased with the increasing of temperature and the decreasing of substrate concentration. The photocatalytic degradation kinetic rate of acetamiprid was low in acid solutions, while high in weak acidic and alkaline solutions. After studying the synergistic effects of these four classic parameters, the optimal experiment conditions for photocatalytic degradation of acetamiprid were obtained as follows: TiO2 at 2.30 g·L-1, initial acetamiprid concentration of 90.0 μmol·L-1, temperature of 37.5℃ and pH value at 5.0. Lastly, 7 degradation intermediates of acetamiprid were detected during photocatalytic process by HPLC, and 6 of them exhibited more polar than the parent molecule. |
