Oxidation of diclofenac by birnessite: Identification of products and proposed transformation pathway

文献类型： 外文期刊

第一作者： Zhao, Yue

作者： Zhao, Yue;Wang, Min;Zhao, Yue;Liu, Fei;Zhao, Yue;Liu, Fei;Qin, Xiaopeng

作者机构：

关键词： Birnessite; Diclofenac; Oxidation mechanism; Transformation pathway; Emerging contaminants

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：5.565； 五年影响因子：5.066 ）

ISSN： 1001-0742

年卷期： 2020 年 98 卷

页码：

收录情况： SCI

摘要： Diclofenac (DCF), a widely used non-steroidal anti-inflammatory, reacted readily with birnessite under mild conditions, and the pseudo first order kinetic constants achieved 8.84 x 10(-2) hr(-1). Five products of DCF including an iminoquinone product (2,5-iminoquinone-diclofenac) and four dimer products were observed and identified by tandem mass spectrometry during the reaction. Meanwhile, 2,5-iminoquinone-diclofenac was identified to be the major product, accounting for 83.09% of the transformed DCF. According to the results of spectroscopic Mn(III) trapping experiments and X-ray Photoelectron Spectroscopy, Mn(IV) contained in birnessite solid was consumed and mainly converted into Mn(III) during reaction process, which proved that the removal of DCF by birnessite was through oxidation. Based on the identified products of DCF and the changes of Mn valence state in birnessite solid, a tentative transformation pathway of DCF was proposed. (C) 2020 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

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