Oxidation of nonylphenol and octylphenol by manganese dioxide: Kinetics and pathways

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摘要：

Due to their potent estrogenicity and ubiquitous occurrence, non-ionic surfactant metabolites nonylphenol (NP) and octylphenol (OP) are of significant concern. Abiotic chemical oxidation by naturally abundant metal oxides may be an important route of their environmental attenuation, but is poorly understood. We investigated the reaction kinetics and pathways of NP and OP with MnO2. At pH 5.5 and 100 mg/L delta-MnO2, 92, 84 and 76% of 4-n-NP, 4-tert-OP and technical nonylphenol (tNP) was transformed in 90 min, respectively. A further experiment using a Mn-containing soil and Mn-removed soil confirmed that soil MnO2 caused NP removal. Multiple reaction products, including hydroquinone, hydroxylated products, dimers and trimers were identified through fragmentation analysis by GC-MS/MS and UPLC-MS/MS, allowing the construction of tentative pathways. This study suggested that abiotic oxidation by MnO2 may contribute to the dissipation of tNP, 4-n-NP, 4-tert-OP and their analogues in the natural environment. (C) 2013 Elsevier Ltd. All rights reserved.

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关键词：

Surfactant metabolites Nonylphenol Manganese oxides Natural attenuation

DOI：

10.1016/j.envpol.2013.05.047

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年份：

2013