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Mixing due to Solution Switch Limits the Performance of Electrosorption for Desalination
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-07-18 , DOI: 10.1021/acs.est.4c02681 Weifan Liu 1 , Longqian Xu 1 , Zezhou Yang 2 , Xudong Zhang 1 , Shihong Lin 1, 2
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-07-18 , DOI: 10.1021/acs.est.4c02681 Weifan Liu 1 , Longqian Xu 1 , Zezhou Yang 2 , Xudong Zhang 1 , Shihong Lin 1, 2
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Electrosorption (ES) is a research frontier in electrochemical separation, with proven potential applications in desalination, wastewater treatment, and selective resource extraction. However, due to the limited adsorption capacity of film electrodes, ES requires short circuiting or circuit reversal, accompanied by a solution switch between the feed solution and receiving solution, to sustain desalination over many charge–discharge cycles. In previously reported studies, solution switches have been commonly ignored to simplify experimental procedures, and their impacts on separation performance are thus not well understood. This study aims to provide a quantitative analysis of the impacts of mixing due to a solution switch on the performance of ES-based desalination. A numerical model of ES has been employed to evaluate the adverse effects of the solution switch on the desalination performance in three commonly used operation modes. The analysis reveals that the impacts of mixing due to solution-switch are more severe with a larger concentration difference between the desalinated water and the brine and provides insights into the effectiveness of increasing electrode loading or specific capacity in mitigating the detrimental impacts of mixing. Even with state-of-the-art systems, producing freshwater from seawater or even brackish water with medium-to-high salinity is practically challenging due to the presence of solution switch.
中文翻译：
溶液切换导致的混合限制了脱盐电吸附的性能
电吸附（ES）是电化学分离的研究前沿，在海水淡化、废水处理和选择性资源提取方面具有已被证明的潜在应用。然而，由于薄膜电极的吸附能力有限，ES需要短路或电路反转，并伴随着进料溶液和接收溶液之间的溶液切换，以在许多充放电循环中维持脱盐。在之前报道的研究中，为了简化实验程序，溶液切换通常被忽略，因此它们对分离性能的影响尚不清楚。本研究旨在定量分析由于溶液切换而导致的混合对基于 ES 的海水淡化性能的影响。采用 ES 数值模型来评估三种常用操作模式下溶液切换对海水淡化性能的不利影响。分析表明，随着淡化水和盐水之间的浓度差较大，由于溶液转换而导致的混合影响更加严重，并提供了关于增加电极负载或比容量在减轻混合有害影响方面的有效性的见解。即使采用最先进的系统，由于溶液切换的存在，从海水甚至中高盐度的咸水生产淡水实际上也具有挑战性。
更新日期：2024-07-18
中文翻译：
溶液切换导致的混合限制了脱盐电吸附的性能
电吸附（ES）是电化学分离的研究前沿，在海水淡化、废水处理和选择性资源提取方面具有已被证明的潜在应用。然而，由于薄膜电极的吸附能力有限，ES需要短路或电路反转，并伴随着进料溶液和接收溶液之间的溶液切换，以在许多充放电循环中维持脱盐。在之前报道的研究中，为了简化实验程序，溶液切换通常被忽略，因此它们对分离性能的影响尚不清楚。本研究旨在定量分析由于溶液切换而导致的混合对基于 ES 的海水淡化性能的影响。采用 ES 数值模型来评估三种常用操作模式下溶液切换对海水淡化性能的不利影响。分析表明，随着淡化水和盐水之间的浓度差较大，由于溶液转换而导致的混合影响更加严重，并提供了关于增加电极负载或比容量在减轻混合有害影响方面的有效性的见解。即使采用最先进的系统，由于溶液切换的存在，从海水甚至中高盐度的咸水生产淡水实际上也具有挑战性。
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