基于Donnan理论的非对称吸附ICP-CDI体系构建及其除盐机制研究

电除盐体系在含盐水体淡化应用中具有显著优势，然而，体系能量效率与除盐效果之间依然难以达到平衡，盐离子在体系中的迁移作用与电化学反应机理尚不明晰。本研究针对电除盐体系中能量效率提升的瓶颈问题，将Donnan平衡原理引入CDI体系，提出了基于非对称吸附的ICP-CDI技术，选取离子吸附容量高、充放电能力强的赝电容材料作为电极基底，通过官能团修饰的方法将离子选择性功能内化于电极内部，利用阴阳离子扩散速率差异的原理，构建非对称吸附体系，抑制低浓度离子边界层对体系能耗的影响。拟重点研究体系中的界面离子扩散及反应机制，将微流控模型实验与直接数值模拟相结合，探明影响除盐过程能量消耗的关键因素，以指导电极材料制备、电池构型、操作参数等方面的优化调控。本课题为电化学脱盐的机制探究提供了新的视角，为含盐水体净化与回用提供了新的解决方案及技术途径，具有重要的理论意义和应用价值。

The electro-driven desalination system has significant advantages in the existing desalination technologies. However, it is still difficult to achieve a balance between the energy efficiency and the desalination effect. The salt ions migration and the electrochemical reaction mechanism are still unclear. Aiming at the bottleneck of energy efficiency improvement in the electro-driven desalination system, this research introduces the Donnan equilibrium theory into the CDI system, and proposes an ICP-CDI technology based on asymmetric adsorption. Pseudocapacitance materials with high ion adsorption capacity and strong charge and discharge capabilities are selected as the electrode substrate, and the ion selective functions are internalized into the electrode under modification. In order to suppress the influence of the low-concentration ion boundary layer on the energy consumption, the principle of the difference in the diffusion rate of anion and cation will be used to construct an asymmetric adsorption system. It is planned to focus on studying the interface ion diffusion and reaction mechanism in the system by combining the microfluidic model experiment with direct numerical simulation. The key factors affecting the energy consumption of the desalination process will be found out to guide electrode material preparation, battery configuration, and operating parameters Optimal regulation and other aspects. The subject provides a new perspective for the investigation of the mechanism of electro-driven desalination, and provides a new solution and technical approach for the purification and reuse of salt water, which has important theoretical significance and application value.