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题名: Temperature effect on photolysis decomposing of perfluorooctanoic acid
作者: Zhang, Tiliang; Pan, Gang; null(周琴)
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
DOI: 10.1016/j.jes.2015.05.008
部门归属: 环境纳米材料实验室
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
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/36005
Appears in Collections:环境纳米材料实验室_期刊论文

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