Abstract The study was performed to understand the feasibility of graphite felt for electro-enhanced removal of perchlorate ions through capacitive deionization process (CDI) in aqueous solution. The cyclic voltammetry studies indicated that the perchlorate ions neither get oxidized nor reduced under the operating conditions for the applied potential range of 1.5 V. The effect of voltage, flow rate, perchlorate concentration, pH of the solution and temperature on the electrosorption was studied. The electrosorption capacity increased with increasing applied potential, flow rate and perchlorate concentration. The change in pH significantly affected the removal efficiency due to competitive ionic effect. The increase in temperature had a negative impact on the electrosorption capacity. Langmuir model was found to be a better fit than the Freundlich model and the maximum electrosorption capacity was found to be 21.1 mg g−1. It was observed that electro-enhanced adsorption followed pseudo first order kinetic model with a rate constant of 0.45 min−1 for an initial concentration of 1000 mg L−1 operated at 1.5 V. Moreover the graphite felt exhibited good repeatability of the electrosorption process and affinity toward perchlorate ions. Thus it can be concluded that the graphite felt electrode can be potentially used for electrosorptive removal of perchlorate ions from the aqueous solution.

中文翻译：

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使用电容去离子工艺电增强去除水溶液中高氯酸根离子

摘要 本研究旨在了解石墨毡在水溶液中通过电容去离子法（CDI）电增强去除高氯酸根离子的可行性。循环伏安法研究表明，高氯酸根离子在 1.5 V 的施加电压范围内的操作条件下既不会被氧化也不会被还原。研究了电压、流速、高氯酸根浓度、溶液的 pH 值和温度对电吸附的影响。电吸附能力随着施加电位、流速和高氯酸盐浓度的增加而增加。由于竞争性离子效应，pH值的变化显着影响去除效率。温度升高对电吸附能力有负面影响。发现 Langmuir 模型比 Freundlich 模型更适合，并且发现最大电吸附容量为 21.1 mg g-1。观察到电增强吸附遵循伪一级动力学模型，初始浓度为 1000 mg L-1，在 1.5 V 下操作时速率常数为 0.45 min-1。此外，石墨毡表现出良好的电吸附过程重复性和对高氯酸根离子的亲和力。因此可以得出结论，石墨毡电极可以潜在地用于从水溶液中电吸附去除高氯酸根离子。45 min-1 对于 1000 mg L-1 的初始浓度，在 1.5 V 下操作。此外，石墨毡表现出良好的电吸附过程可重复性和对高氯酸根离子的亲和力。因此可以得出结论，石墨毡电极可以潜在地用于从水溶液中电吸附去除高氯酸根离子。45 min-1 对于 1000 mg L-1 的初始浓度，在 1.5 V 下操作。此外，石墨毡表现出良好的电吸附过程可重复性和对高氯酸根离子的亲和力。因此可以得出结论，石墨毡电极可以潜在地用于从水溶液中电吸附去除高氯酸根离子。