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Permselective ion electrosorption of subnanometer pores at high molar strength enables capacitive deionization of saline water
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2019/12/16 , DOI: 10.1039/c9se00996e Sheng Bi 1, 2, 3, 4, 5 , Yuan Zhang 6, 7, 8, 9, 10 , Luca Cervini 11, 12, 13, 14 , Tangming Mo 1, 2, 3, 4, 5 , John M. Griffin 11, 12, 13, 14, 15 , Volker Presser 6, 7, 8, 9, 10 , Guang Feng 1, 2, 3, 4, 5
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2019/12/16 , DOI: 10.1039/c9se00996e Sheng Bi 1, 2, 3, 4, 5 , Yuan Zhang 6, 7, 8, 9, 10 , Luca Cervini 11, 12, 13, 14 , Tangming Mo 1, 2, 3, 4, 5 , John M. Griffin 11, 12, 13, 14, 15 , Volker Presser 6, 7, 8, 9, 10 , Guang Feng 1, 2, 3, 4, 5
Affiliation
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Capacitive deionization with porous carbon electrodes is an energy-efficient water treatment technique limited to the remediation of only brackish water due to the severe efficiency drop at high molar strength. Combining experiment and simulation, our work demonstrates the ability of subnanometer pores for permselective ion electrosorption, which enables capacitive deionization for saline media with high concentrations. Molecular dynamics simulations reveal the origin of permselective ion electrosorption in subnanometer pores at high molar strength. Within the subnanometer range, carbon pores with smaller size become more ionophobic and then express a higher ability of permselective ion electrosorption. This can be understood by the effects of the pore size on the microstructure of in-pore water and ions and the nanoconfinement effects on the ion hydration. These findings provide a new avenue for capacitive deionization of saline water (seawater-like ionic strength) to enable the application of highly concentrated saline media by direct use of porous carbons.
中文翻译：
在高摩尔强度下，亚纳米孔的全选择性离子电吸附可实现盐水的电容去离子
多孔碳电极的电容去离子是一种节能的水处理技术，由于高摩尔强度下效率的严重下降，仅限于微咸水的修复。结合实验和模拟，我们的工作证明了亚纳米孔对渗透选择性离子电吸附的能力，从而能够对高浓度盐介质进行电容去离子。分子动力学模拟揭示了亚摩尔浓度高的亚纳米孔中渗透选择性离子电吸附的起源。在亚纳米范围内，具有较小尺寸的碳孔变得更具疏电性，然后表现出更高的渗透选择性离子电吸附能力。这可以通过孔径对孔内水和离子的微观结构的影响以及纳米约束对离子水化的影响来理解。这些发现为盐水的电容去离子（类似于海水的离子强度）提供了新途径，从而能够通过直接使用多孔碳来应用高浓度盐水介质。
更新日期：2020-03-03
中文翻译：
在高摩尔强度下，亚纳米孔的全选择性离子电吸附可实现盐水的电容去离子
多孔碳电极的电容去离子是一种节能的水处理技术，由于高摩尔强度下效率的严重下降，仅限于微咸水的修复。结合实验和模拟，我们的工作证明了亚纳米孔对渗透选择性离子电吸附的能力，从而能够对高浓度盐介质进行电容去离子。分子动力学模拟揭示了亚摩尔浓度高的亚纳米孔中渗透选择性离子电吸附的起源。在亚纳米范围内，具有较小尺寸的碳孔变得更具疏电性，然后表现出更高的渗透选择性离子电吸附能力。这可以通过孔径对孔内水和离子的微观结构的影响以及纳米约束对离子水化的影响来理解。这些发现为盐水的电容去离子（类似于海水的离子强度）提供了新途径，从而能够通过直接使用多孔碳来应用高浓度盐水介质。
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