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Chronopotentiometry Applied to the Determination of Copper Transport Properties Through a Cation-Exchange Membrane

机译：通过阳离子交换膜的计时量应用于铜传输性能的测定

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Over the past several decades, electrodialysis membranes have been employed for the removal of metals from galvanizing industry effluents. However, for its technical viability, it is useful to know some properties of the system to avoid, for example, precipitation of inorganic salts, destruction of the membrane and an increase in the energy consumption. The scope of the present study is to use chronopotentiometry to determine limiting current densities, transition times and resistances of the cationic membrane HDX 100 using a synthesized solution of the galvanizing industry effluent prepared with copper sulfate and sulfuric acid in different concentrations: 0.1, 0.5 and 1.0 g/L of Cu~(+2). The current-voltage and chronopotentiometric curves obtained have clearly defined regions and it was verified that the Cu~(+2) concentration causes a significant increase in the limiting current densities and in transition times. However, a high decrease in resistance occurred because at the highest concentrations, it is more difficult to reach the zero concentration value at the membrane surface. Besides, the pH increase causes a significant decrease in the limiting current density and in the transport number, but a slight increase in the resistance due to the presence of hydrogen. The results obtained confirm that the chronopotentiometry method is a valuable tool to determine membrane properties.
机译：在过去的几十年中，电渗析膜已被用于检测来自镀锌行业废水中去除金属。然而，对于它的技术可行性，是有用的知道该系统的一些特性，以避免，例如，无机盐，膜破坏，并增加了能量消耗的沉淀。本研究的范围是使用计时，以确定限流的电流密度，转换时间和使用该镀锌行业的合成溶液中的阳离子膜HDX 100的电阻流出物用硫酸铜和硫酸在不同浓度制备：0.1，0.5和为1.0g /铜〜（2）中的L.的电流 - 电压和计时电位曲线得到具有明确定义的区域和可以确认在Cu〜（2）的浓度导致在极限电流密度和在过渡时间一个显著增加。然而，在电阻高减少的发生是因为在最高浓度下，它更难以达到在膜表面上的零浓度值。此外，pH值的增加导致在极限电流密度和在运输数量显著减少，但由于氢的存在的轻微增加的阻力。所获得的结果证实，该计时方法是确定膜性能的有价值的工具。

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