Efficient decomposition of environmentally persistent perfluorocarboxylic acids by use of persulfate as a photochemical oxidant
Efficient decomposition of environmentally persistent perfluorocarboxylic acids by use of persulfate as a photochemical oxidant
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DOI：
10.1021/es0484754
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发表时间：
2005-04-01
影响因子：
11.4
通讯作者：
Kutsuna, S
中科院分区：
文献类型：
--
作者：
Hori, H;Yamamoto, A;Kutsuna, S
研究了水中持久性全氟羧酸（PFCAs）在过硫酸根离子（S2 O 82-）作用下的光化学降解，以建立一种中和固定源PFCAs的技术。S-2 O-8（2-）的光解产生高度氧化性的硫酸根阴离子（SO 4中心点-），其有效地分解全氟辛酸（PFOA）和其它带有C4-C8全氟烷基的PFCAs。主要产物是F-和CO2;此外，在反应溶液中检测到少量的短于初始链长的PFCAs。浓度为1.35 mM的PFOA（在含氟聚合物制造中乳化过程后的未处理废水中的典型浓度）通过具有50 mM S2 O 82-和200-W氙-汞灯照射4小时的光化学系统完全分解。PFOA的初始分解率比光分解高11倍。通过该方法，反应溶液中的所有含硫物种最终转化为硫酸根离子。该方法成功地应用于地板蜡溶液中全氟壬酸的分解。
Photochemical decomposition of persistent perfluorocarboxylic acids (PFCAs) in water by use of persulfate ion (S2O82-) was examined to develop a technique to neutralize stationary sources of PFCAs. Photolysis Of S-2 O-8(2-) produced highly oxidative sulfate radical anions (SO4 center dot-), which efficiently decomposed perfluorooctanoic acid (PFOA) and other PFCAs bearing C-4-C-8 perfluoroalkyl groups. The major products were F- and CO2; also, small amounts of PFCAs with shorter than initial chain lengths were detected in the reaction solution. PFOA at a concentration of 1.35 mM (typical of that in untreated wastewater after an emulsifying process in fluoropolymer manufacture) was completely decomposed by a photochemical system with 50 mM S2O82- and 4 h of irradiation from a 200-W xenon-mercury lamp. The initial PFOA decomposition rate was 11 times higher than with photolysis alone. All sulfur-containing species in the reaction solution were eventually transformed to sulfate ions by this method. This method was successfully applied to the decomposition of perfluorononanoic acid contained in a floor wax solution.