Electrochemical treatment of 2, 4-dichlorophenol using a nanostructured 3D-porous Ti/Sb-SnO2-Gr anode: Reaction kinetics, mechanism, and continuous operation
Electrochemical treatment of 2, 4-dichlorophenol using a nanostructured 3D-porous Ti/Sb-SnO2-Gr anode: Reaction kinetics, mechanism, and continuous operation
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使用纳米结构 3D 多孔 Ti/Sb-SnO2-Gr 阳极电化学处理 2, 4-二氯苯酚：反应动力学、机理和连续操作
DOI：
10.1016/j.chemosphere.2017.06.125
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发表时间：
2017-10-01
期刊：
影响因子：
8.8
通讯作者：
Wang, Chuanyi
中科院分区：
文献类型：
--
作者：
Asim, Sumreen;Zhu, Yunqing;Wang, Chuanyi
2,4二氯苯酚（2,4 - dcp）被认为是一种剧毒、致突变和可能致癌的污染物。本研究主要研究了2,4 - dcp在纳米结构3d多孔Ti/Sb-SnO2-Gr阳极上的电化学氧化，目的是通过影响动力学的研究、羟基自由基的反应性和中间体的分析来全面阐明矿化过程。在pH为3时，使用Na2SO4电解质在电流密度为30 mA cm（-2）时获得了高效率。在优化条件下，电解40 min内2,4 - dcp去除率最高可达99.9%，TOC去除率达81%，ECTOC最低（0.49 kW h g(-1)）。为了探索3D-Ti/Sb-SnO2-Gr电极的稳定性，建立了连续电化学操作，一致的矿化结果表明了3D-Ti/Sb-SnO2-Gr体系在耐久性和实际应用方面的有效性。EPR研究表明，3D-Ti/Sb-SnO2-Gr表面大量生成(OH)- o中心点自由基，导致污染物快速难降解焚烧。从脱氯和(OH)- o中心点自由基的反应活性中，检测到包括6个环副产物和3个脂肪羧酸在内的几个中间体，并提出了两种可能的降解途径，证明2,4 - dcp完全矿化。(C) 2017 Elsevier Ltd.版权所有。
2, 4 dichlorophenol (2, 4-DCP) is considered to be a highly toxic, mutagenic, and possibly carcinogenic pollutant. This study is focused on the electrochemical oxidation of 2, 4-DCP on nanostructured 3D-porous Ti/Sb-SnO2-Gr anodes, with the aim of presenting a comprehensive elucidation of mineralization process through the investigation of influential kinetics, the reactivity of hydroxyl radical's and analysis of intermediates. High efficiency was achieved at pH of 3 using Na2SO4 electrolytes at a current density of 30 mA cm(-2). Under the optimized conditions, a maximum removal of 2, 4-DCP of up to 99.9% was reached, whereas a TOC removal of 81% was recorded with the lowest ECTOC (0.49 kW h g(-1)) within 40 min of electrolysis. To explore the stability of the 3D-Ti/Sb-SnO2-Gr electrodes, a continuous electrochemical operation was established, and the consistent mineralization results indicated the effectiveness of the 3D-Ti/Sb-SnO2-Gr system concerning its durability and practical utilization. EPR studies demonstrated the abundant generation of (OH)-O-center dot radicals on 3D-Ti/Sb-SnO2-Gr, resulting in fast recalcitrant pollutant incineration. From dechlorination and the reactivity of the (OH)-O-center dot radicals, several intermediates including six cyclic byproducts and three aliphatic carboxylic acids were detected, and two possible degradation pathways were proposed that justify the complete mineralization of 2, 4-DCP. (C) 2017 Elsevier Ltd. All rights reserved.