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首页> 美国卫生研究院文献>Membranes >A 2D Convection-Diffusion Model of Anodic Oxidation of Organic Compounds Mediated by Hydroxyl Radicals Using Porous Reactive Electrochemical Membrane
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A 2D Convection-Diffusion Model of Anodic Oxidation of Organic Compounds Mediated by Hydroxyl Radicals Using Porous Reactive Electrochemical Membrane

机译：多孔反应性电化学膜对羟基自由基介导的有机化合物进行阳极氧化的二维对流扩散模型

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摘要

In recent years, electrochemical methods utilizing reactive electrochemical membranes (REM) have been considered as a promising technology for efficient degradation and mineralization of organic compounds in natural, industrial and municipal wastewaters. In this paper, we propose a two-dimensional (2D) convection-diffusion-reaction model concerning the transport and reaction of organic species with hydroxyl radicals generated at a TiO REM operated in flow-through mode. It allows the determination of unknown parameters of the system by treatment of experimental data and predicts the behavior of the electrolysis setup. There is a good agreement in the calculated and experimental degradation rate of a model pollutant at different permeate fluxes and current densities. The model also provides an understanding of the current density distribution over an electrically heterogeneous surface and its effect on the distribution profile of hydroxyl radicals and diluted species. It was shown that the percentage of the removal of paracetamol increases with decreasing the pore radius and/or increasing the porosity. The effect becomes more pronounced as the current density increases. The model highlights how convection, diffusion and reaction limitations have to be taken into consideration for understanding the effectiveness of the process.
机译：近年来，利用反应性电化学膜（REM）的电化学方法已被认为是有效降解，矿化天然，工业和市政废水中有机化合物的有前途的技术。在本文中，我们提出了一种二维（2D）对流扩散反应模型，该模型涉及有机物与以流通模式运行的TiO REM产生的羟基自由基的迁移和反应。它允许通过处理实验数据来确定系统的未知参数，并预测电解设置的行为。在不同的渗透通量和电流密度下，模型污染物的计算和实验降解率有很好的一致性。该模型还提供了对非均质电表面上电流密度分布及其对羟基自由基和稀释物质分布曲线的影响的理解。结果表明，扑热息痛的去除率随着孔半径的减小和/或孔隙率的增加而增加。随着电流密度的增加，效果变得更加明显。该模型强调了对流，扩散和反应的局限性，以便理解该过程的有效性。

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