铁氰化镍电极用于苦咸水连续阳离子插层脱盐
Nickel Hexacyanoferrate Electrodes for Continuous Cation Intercalation Desalination of Brackish Water
摘要：
使用含有六氰合铁酸镍（NiHCF）纳米粒子的多孔电极，我们构建和测试一个装置中的两个流动通道的设备，其中嵌入电极是在与阴离子交换膜直接接触的电容去离子。当NiHCF带负电时，阳离子嵌入其中，并且其附近的水被脱盐;同时，当该电极中的NiHCF带正电时，相对电极中的水变得更加含盐。在充电和放电的循环过程中，连续地产生甜水，与所施加的电流的方向同步地在两个通道之间交替。我们提出了这种技术的原理验证实验单盐溶液，在那里我们分析了各种水平的电流和周期持续时间。分析了除盐率和能耗。在脱盐实验与盐的混合物中，我们发现了三倍的增强K $^+$在Na $^+$ -吸附，这表明了潜在的NiHCF嵌入电极的选择性离子分离的混合离子溶液。
英文摘要：
Using porous electrodes containing nickel hexacyanoferrate (NiHCF) nanoparticles, we construct and test a device for capacitive deionization in a two flow-channel device where the intercalation electrodes are in direct contact with an anion-exchange membrane. Upon negatively charging NiHCF, cations intercalate into it and the water in its vicinity is desalinated; at the same time water in the opposing electrode becomes more saline upon positively charging the NiHCF in that electrode. In a cyclic process of charge and discharge, fresh water is continuously produced, alternating between the two channels in sync with the direction of applied current. We present proof-of-principle experiments of this technology for single salt solutions, where we analyze various levels of current and cycle durations. We analyze salt removal rate and energy consumption. In desalination experiments with salt mixtures we find a threefold enhancement for K$^+$ over Na$^+$-adsorption, which shows the potential of NiHCF intercalation electrodes for selective ion separation from mixed ionic solutions.
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