Capacitive deionization (CDI) technology has excelled in water treatment areas such as brackish water desalination, hard water softening and pollution ion removal. However, the poor performance of the electrodes used in CDI cell construction continues to limit its practical application. In this work, we used chitosan mixed with potassium hydroxide (KOH) and simply carbonized to synthesize porous carbon electrode materials (CTS-850) with excellent material and electrochemical performance, and achieve high adsorption capacity and fast adsorption rate in a variety of salt solutions. The material characterization of CTS-850 displayed super large specific surface area (>2300 cm³ g^-1), pore volume and excellent nitrogen doping. Electrochemical characterization showed excellent specific capacitance, good conductivity and cycle performance. In CDI experiments, we explored the removal efficiency of electrodes carbonized under different temperatures in single and mixed solution systems, and the CTS-850 electrode had an ultra-high adsorption capacity of 47 mg g^-1 and a fast adsorption rate of 6.7 mg g^-1 min^-1 in 15 mM synthetic municipal wastewater (～1750 mg L^-1). In addition, we discussed the relationship between high adsorption capacity, fast adsorption rate and material properties. Our work is expected to provide guidance for the synthesis of higher performance CDI electrode materials.

电容去离子（CDI）技术在微咸水淡化，硬水软化和去除污染离子等水处理领域表现出色。然而，CDI电池构造中使用的电极的不良性能继续限制了其实际应用。在这项工作中，我们使用壳聚糖与氢氧化钾（KOH）混合并简单碳化，以合成具有优异材料和电化学性能的多孔碳电极材料（CTS-850），并在各种盐溶液中实现高吸附能力和快速吸附速率。CTS-850的材料表征显示超大比表面积（> 2300 cm ³  g ^-1），孔体积和出色的氮掺杂。电化学表征显示出优异的比电容，良好的电导率和循环性能。在CDI实验中，我们探索了在单一和混合溶液系统中在不同温度下碳化的电极的去除效率，CTS-850电极具有47 mg g ^-1的超高吸附容量和6.7 mg g的快速吸附速率在15 mM合成市政废水（〜1750 mg L ^-1）中为^-1  min ^-1。另外，我们讨论了高吸附容量，快速吸附速率和材料性能之间的关系。我们的工作有望为高性能CDI电极材料的合成提供指导。