Laccase-Catalyzed Degradation of Perfluorooctanoic Acid

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• 作者：Qi Luo ; Junhe Lu ; Hao Zhang ; Zunyao Wang ; Mingbao Feng ; Sheau-Yun Dora Chiang ; David Woodward ; Qingguo Huang
• 刊名：Environmental Science & Technology Letters
• 出版年：2015
• 出版时间：July 14, 2015
• 年：2015
• 卷：2
• 期：7
• 页码：198-203
• 全文大小：425K

文摘

This study examined the decomposition of perfluorooctanoic acid (PFOA) in enzyme-catalyzed oxidative humification reactions (ECOHRs). ECOHRs make up a class of reactions that are ubiquitous in the environment. Approximately 50% of PFOA in a mineral buffer solution decomposed upon addition of laccase and 1-hydroxybenzotriazole after 157 days with a pseudo-first-order rate constant of 0.0044 day^鈥? (r² = 0.89). No shorter carbon-chain perfluorocarboxylic acids were detected as degradation products during the experiment. However, partially fluorinated shorter-chain alcohols and aldehydes were identified by high-resolution mass spectrometry. These partially fluorinated compounds were likely products resulting from PFOA degradation via a combination of free radical decarboxylation, rearrangement, and coupling processes. Fluoride was detected in the reaction solution, and the concentration indicated a 28.2% defluorination ratio during the treatment. This finding suggests that PFOA may be transformed during humification, and ECOHRs can potentially be used for the remediation of PFOA.