Three-dimensional heterogeneous Electro-Fenton system with a novel catalytic particle electrode for Bisphenol A removal.
Three-dimensional heterogeneous Electro-Fenton system with a novel catalytic particle electrode for Bisphenol A removal.
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DOI：
10.1016/j.jhazmat.2019.03.067
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发表时间：
2019-03
影响因子：
13.6
通讯作者：
Yimei Zhang;Zhuang Chen;Panpan Wu;Yaxiao Duan;Lincheng Zhou;Yuxian Lai;Fei Wang;Shuai Li
中科院分区：
文献类型：
--
作者：
Yimei Zhang;Zhuang Chen;Panpan Wu;Yaxiao Duan;Lincheng Zhou;Yuxian Lai;Fei Wang;Shuai Li
本文以改进的气体扩散电极（GDE）为阴极，磁性氮掺杂/还原氧化石墨烯（Fe 3 O 4/N-rGO）为催化粒子电极（CPE），构建了一种新型的三维（3D）非均相电芬顿（EF）体系，用于双酚A（BPA）的去除。Fe_3O_4/N-rGO既作为颗粒电极又作为多相催化剂。该研究得出结论，BPA可以通过这种混合系统有效地去除。通过比较不同功能颗粒电极的性能，探讨了三维电极与EF体系之间的协同效应。三维电极体系具有较大的比表面积，有利于污染物向电极的传质，同时由于电子传递加快，加快了FeⅡ的再生，从而提高了EF催化效率。EF过程促进了颗粒电极的再生速率，从而加速了3D电极反应过程。优化了影响BPA降解行为的参数。结果表明，在90 min内，BPA和TOC的最佳去除率分别为93%和60.5%。结果表明，CPE具有较高的催化活性（BPA为86.5%，TOC为50.3%）和较低的催化剂损耗（小于9.5%），具有良好的稳定性和重复使用性。通过比较均相EF和类Fenton EF的催化活性和·OH生成能力，探讨了三维多相EF的可能机理。在对中间产物分析的基础上，提出了双酚A可能的降解途径。
Herein, a novel three-dimensional (3D) heterogeneous Electro-Fenton (EF) system with improved gas diffusion electrode (GDE) as cathode and magnetic nitrogen doped/reduced graphene oxide (Fe3O4/N-rGO) as catalytic particle electrodes (CPEs) was built for Bisphenol A (BPA) removal. The Fe3O4/N-rGO served as both particle electrodes and heterogeneous catalyst. The study concluded that BPA could be effectively removed via this hybrid system. The synergistic effect between the 3D electrode and EF system was discussed by comparing the performance of different functional particle electrodes. The 3D electrode system exhibited a larger specific surface area electrode, which improved the mass transfer of pollutants to electrode, and also accelerated the regeneration of FeⅡdue to faster electron transfer, thereby enhancing the efficiency of EF catalysis. The EF process promotes the regeneration rate of particle electrodes and thus accelerates the 3D electrode reaction course. The parameters affecting degradation behavior of BPA were optimized. As a result, optimal removal rate of BPA and TOC was 93% and 60.5%, respectively within 90 min. The CPEs showed high catalytic performance (86.5% for BPA and 50.3% for TOC) and low catalyst loss (less than 9.5%) after 5 cycles, indicating its excellent stability and reusability. The possible mechanism of 3D heterogeneous EF was investigated by comparing the catalytic activity and •OH production capacity of homogeneous EF and Fenton-like. Built on the analysis of intermediates, a possible decomposition pathway of BPA was proposed.