Overlooked self-catalytic mechanism in phenolic moiety-mediated Fenton-like system: Formation of Fe(III) hydroperoxide complex and co-treatment of refractory pollutants

文献类型： 外文期刊

第一作者： Chen, Cheng

作者： Chen, Cheng;Wang, Yongyi;Huang, Yajing;Qu, Wei;Xia, Dehua;He, Chun;Hua, Jian;Sharma, Virender K.;Shu, Dong

作者机构：

关键词： Self-catalysis; Fe(III); Fe(II) redox cycling; Fe(III) hydroperoxide complex; Fenton-like reaction; Phenolic pollutants

期刊名称：APPLIED CATALYSIS B-ENVIRONMENTAL （ 影响因子：22.1； 五年影响因子：19.7 ）

ISSN： 0926-3373

年卷期： 2023 年 321 卷

页码：

收录情况： SCI

摘要： Applications of Fenton-like reactions (Fe(III)/H2O2) without catalyst have low efficiency in remediating pollutants. Herein, pollutants containing phenolic moiety (P, e.g., paracetamol (PCM)) were demonstrated to make Fe(III)/H2O2 system highly effective in degrading a wide range of contaminants. Kinetics analysis shows the selfcatalytic degradation of PCM with optimum performance at pH 4.0, and Fe(III)/Fe(II) conversion was accelerated without the assistance of cocatalyst. Based on state-of-art spectroscopy measurements and theoretical calculations, the overlooked self-catalytic mechanism was revealed. In the presence of phenolic moiety, a yellowcolored high-spin P-Fe(III)-OOH complex can be formed in Fe(III)/H2O2 system, which subsequently converts to Fe(II). Afterwards, the oxidation of P gives hydroquinone that also facilitates the cycling of Fe(III)/Fe(II). The accumulated Fe(II) reacts with H2O2 to generate hydroxyl radicals, the major species responsible to oxidize pollutants, thereby achieving efficient decontaminant performance. Results provide new insights into the selfcatalytic Fenton-like process for remediating a mixture of pollutants.

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