Temperature effect on photolysis decomposing of perfluorooctanoic acid
文献类型：期刊论文
| 作者 | Zhang, Tiliang; Pan, Gang; Zhou, Qin
|
| 刊名 | JOURNAL OF ENVIRONMENTAL SCIENCES
 |
| 出版日期 | 2016-04 |
| 卷号 | 42期号:0页码:126-133 |
| 关键词 | Perfluorooctanoic acid PFOA Photolysis Temperature effect |
| 英文摘要 | Perfluorooctanoic acid (PFOA) is recalcitrant to degrade and mineralize. Here, the effect of temperature on the photolytic decomposition of PFOA was investigated. The decomposition of PFOA was enhanced from 34% to 99% in 60 min of exposure when the temperature was increased from 25 to 85 degrees C under UV light (201-600 nm). The limited degree of decomposition at 25 degrees C was due to low quantum yield, which was increased by a factor of 12 at 85 degrees C. Under the imposed conditions, the defluorination ratio increased from 8% at 25 degrees C to 50% at 85 degrees C in 60 min. Production of perfluorinated carboxylic acids (PFCAs, C7-C5), PFCAs (C4-C3) and TFA (trifluoroacetic acid, C2) accelerated and attained a maximum within 30 to 90 min at 85 degrees C. However, these reactions did not occur at 25 degrees C despite extended irradiation to 180 min. PFOA was decomposed in a step-wise process by surrendering one CF2 unit. In each cyclical process, increased temperature enhanced the quantum yields of irradiation and reactions between water molecules and intermediates radicals. The energy consumption for removing each mu mol of PFOA was reduced from 82.5 kJ at 25 degrees C to 10.9 kJ at 85 degrees C using photolysis. Photolysis coupled with heat achieved high rates of PFOA degradation and defluorination. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. |
| 收录类别 | SCI |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/36005]  |
| 专题 | 生态环境研究中心_环境纳米材料实验室 |
| 推荐引用方式 GB/T 7714 | Zhang, Tiliang,Pan, Gang,Zhou, Qin. Temperature effect on photolysis decomposing of perfluorooctanoic acid[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2016,42(0):126-133. |
| APA | Zhang, Tiliang,Pan, Gang,&Zhou, Qin.(2016).Temperature effect on photolysis decomposing of perfluorooctanoic acid.JOURNAL OF ENVIRONMENTAL SCIENCES,42(0),126-133. |
| MLA | Zhang, Tiliang,et al."Temperature effect on photolysis decomposing of perfluorooctanoic acid".JOURNAL OF ENVIRONMENTAL SCIENCES 42.0(2016):126-133. |
入库方式： OAI收割
来源：生态环境研究中心
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