Abstract: Nickel hexacyanoferrate (NiHCF) films were synthesized on porous three-dimensional carbon felt (PTCF) substrates by repetitious batch chemical deposition, and the NiHCF/PTCF was investigated as electrochemically switched ion exchange (ESIX) electrode of packed bed for continuous cesium ion separation. Scanning electron microscopy (SEM) and cyclic voltammetry (CV) technique were used to characterize the prepared electrodes. CV investigation confirmed the effects of solution concentration on the ion-exchange capacity of NiHCF/PTCF electrodes. The cycling stability and long-term storage stability of NiHCF/PTCF electrodes were also studied. Ion exchange ability of NiHCF/PTCF electrodes was used to assemble a diaphragm-isolated ESIX reactor for cesium separation. The continuous operation of cesium separation and regeneration process of NiHCF/PTCF electrodes based on the diaphragm-isolated reactor was tested in a two-electrode system of laboratory scale. This is of particular interest from an industrial point of views for scaling up to meet requirements for practical application.

摘要： 采用化学沉积法在三维多孔碳毡（PTCF）基体上制备了电活性铁氰化镍（NiHCF）薄膜，并以NiHCF/PTCF为电控离子交换（ESIX）填充床电极考察其连续铯离子分离性能。用扫描电镜(SEM)研究了膜的表面形貌，用循环伏安（CV）测试了不同制膜液浓度下制备的NiHCF/PTCF膜电极的电化学性能，并考察了膜电极的循环稳定性及在水中长期贮存的稳定性。基于NiHCF/PTCF膜电极的离子交换能力组装了隔膜式ESIX反应器，并在两电极体系下考察了ESIX膜电极对模拟废液中放射性Cs+的连续吸附分离及再生性能。研究结果对新型ESIX技术的实际应用有重要指导意义。