Skolotneva Ekaterina, Trellu Clement, Cretin Marc, Mareev Semyon
Physical Chemistry Department, Kuban State University, 149 Stavropolskaya str., 350040 Krasnodar, Russia.
Laboratoire Géomatériaux et Environnement (EA 4508), Université Gustave Eiffel, 77454 Marne la Vallée, France.
Membranes (Basel). 2020 May 16;10(5):102. doi: 10.3390/membranes10050102.
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.
近年来，利用反应性电化学膜（REM）的电化学方法被认为是一种很有前景的技术，可用于高效降解和矿化天然、工业和城市废水中的有机化合物。在本文中，我们提出了一个二维（2D）对流-扩散-反应模型，该模型涉及在流通模式下运行的TiO REM中有机物种与羟基自由基的传输和反应。它允许通过处理实验数据来确定系统的未知参数，并预测电解装置的行为。在不同渗透通量和电流密度下，模型污染物的计算降解率与实验降解率之间有很好的一致性。该模型还提供了对电不均匀表面上电流密度分布及其对羟基自由基和稀释物种分布轮廓影响的理解。结果表明，扑热息痛的去除百分比随着孔径减小和/或孔隙率增加而增加。随着电流密度增加，这种效应变得更加明显。该模型突出了在理解该过程的有效性时，必须如何考虑对流、扩散和反应限制。
