电增强电容去离子法去除水溶液中的铜离子。
Electro-enhanced removal of copper ions from aqueous solutions by capacitive deionization.
机构信息
Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Rd., Taipei 10617, Taiwan.
Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Rd., Taipei 10617, Taiwan.
出版信息
J Hazard Mater. 2014 Aug 15;278:8-15. doi: 10.1016/j.jhazmat.2014.05.074. Epub 2014 Jun 2.
This study was performed to determine the feasibility of electrosorptive removal of copper ions from aqueous solutions using a capacitive deionization process. The electrosorptive potential of copper ions was determined using cyclic voltammetry measurements, and copper electrodeposition could be suppressed at a voltage less than 0.8 V. Importantly, the experimental results demonstrated a significant enhancement of electrosorption capability of copper ions using the activated carbon electrodes under electro-assistance, associated with electrical double-layer charging. At 0.8 V, the equilibrium electrosorption capacity was enhanced to 24.57 mg/g based on the Langmuir model, and the electrosorption constant rate was increased to 0.038 min(-1) simulated by a first-order kinetics model. Moreover, the activated carbon electrode showed great regeneration performance for the removal of low level copper ions. Additional experiments regarding electrosorption selectivity were performed in the presence of sodium chloride, natural organic matter, or dissolved silica. Copper ions that were preferentially electroadsorbed on the electrode surface can be effectively removed in a competitive environment. Therefore, the electrosorption process using activated carbon electrodes can be recommended to treat copper solutions at low concentrations for wastewater treatment and water purification.
本研究旨在确定使用电容去离子过程从水溶液中电吸附去除铜离子的可行性。通过循环伏安法测量确定了铜离子的电吸附电位，可以在小于 0.8 V 的电压下抑制铜的电沉积。重要的是，实验结果表明，在电辅助下，活性炭电极对铜离子的电吸附能力显著增强，这与双电层充电有关。在 0.8 V 时，基于 Langmuir 模型，平衡电吸附容量提高到 24.57 mg/g，通过一级动力学模型模拟的电吸附常数速率提高到 0.038 min(-1)。此外，活性炭电极对去除低浓度铜离子具有良好的再生性能。在存在氯化钠、天然有机物或溶解硅的情况下进行了额外的电吸附选择性实验。优先吸附在电极表面的铜离子可以在竞争环境中被有效去除。因此，推荐使用活性炭电极的电吸附工艺来处理低浓度的铜溶液，以进行废水处理和水净化。
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