VUV 光辐照下水溶液中全氟癸酸的光化学分解。
Photochemical decomposition of perfluorodecanoic acid in aqueous solution with VUV light irradiation.
机构信息
Environmental Science Research Institution, College of Environment Science and Engineering, Huazhong University of Science and Technology, Wuhan, PR China.
出版信息
J Hazard Mater. 2010 Sep 15;181(1-3):187-92. doi: 10.1016/j.jhazmat.2010.04.115. Epub 2010 May 6.
The photochemical decomposition of perfluorodecanoic acid (PFDeA) in water in the presence of persulfate ion (S(2)O(8)(2-)) and sulfur ion (S(2-)) was investigated under vacuum ultraviolet (VUV) light irradiation. PFDeA was decomposed under VUV light irradiation. With the addition of S(2)O(8)(2-) or S(2-), the photo-decomposition and defluorination of PFDeA were enhanced significantly. Sulfate radical anion (SO(4)(*-)) generated from photolysis of S(2)O(8)(2-) initiated PFDeA oxidation. While the S(2-) ion, acting as a *OH scavenger, enhanced the role of reduction pathway induced by aqueous electrons (e(aq)(-)). The shorter-chain perfluorocarboxylic acids (PFCAs), formed in a stepwise manner from longer-chain PFCAs, were identified as products by HPLC/MS.
在真空紫外（VUV）光辐照下，研究了过硫酸根离子（S(2)O(8)(2-))和硫离子（S(2-))存在下水中全氟癸酸（PFDeA）的光化学分解。PFDeA 在 VUV 光辐照下被分解。添加 S(2)O(8)(2-)或 S(2-)时，PFDeA 的光解和脱氟明显增强。S(2)O(8)(2-)光解生成的硫酸根自由基阴离子（SO(4)(-)）引发 PFDeA 氧化。而 S(2-)离子作为OH 清除剂，增强了由水合电子（e(aq)(-))引起的还原途径的作用。通过 HPLC/MS 鉴定，以逐步的方式从长链全氟羧酸（PFCAs）形成短链全氟羧酸（PFCAs）作为产物。
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