| 水溶液中α-萘乙酸的光降解研究 |
| 摘要点击 948 全文点击 1991 投稿时间：1996-07-08 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 光降解 α-萘乙酸 紫外光． |
| 英文关键词 photolysis α-naphthaleneacetic acid ultraviolet light |
|
| 中文摘要 |
| 为了解α-萘乙酸(NAA)在环境中滞留、迁移和转化等行为,以低功率紫外灯和荧光灯为光源,对水溶液中的NAA进行光降解。研究结果表明,主波长为254nm的紫外光能有效降解NAA,降解呈一级动力学反应;而主波长为365nm的长波光对NAA几乎不降解;添加TiO2能有效催化NAA的降解。采用GC-MS技术鉴定了几种光解主要产物,NAA的光降解包括氧化脱羧和芳环的氧化断裂过程。 |
| 英文摘要 |
| Photolysis of α-naphthaleneacetic acid(NAA)has been investigated at 25℃ in aqueous solutions by irradiation at different wavelengths. The shorter wavelength of 254nm is considerably more effective in promoting degradation than wavelength of 365nm. The primary degradation of NAA follows a pseudo first order kinetics. The photolysis half life and rate constant were determined to be 60min and 1.15×10-2 min-1 respectively. The optimum photolysis rate has been observed using TiO2 powder as photocatalyst. Several reaction intermediates were identified using GC/MS technique. The photolysis of NAA involves decarboxylation and oxidation on aromatic ring.On the basis of the analytical data, a mechanism of the process has been proposed. |
|
|
|
