采用毛细化学沉积法在炭纸/石墨颗粒复合导电基体的微孔通道内合成铁氰化镍(Nickel hexacyanoferrate,NiHCF)薄膜,并考察了膜电极在碱金属溶液中的电控离子交换性能.通过扫描电子显微镜、能量色散谱、X射线光电子能谱、红外分子吸收光谱等分析了复合薄膜电极的表面形貌及组成;利用离子色谱检测了再生液中碱金属离子浓度变化;应用循环伏安法在1 mol · L~(-1) KNO_3/C_sNO_3溶液中考察了膜电极的离子交换容量、循环寿命与再生能力.结果表明:炭纸/石墨复合基体具有三维多孔结构特征,复合基体NiHCF膜电极具有大的离子交换容量、低的扩散阻力、良好的循环稳定性与再生能力,可用于碱金属离子的选择性分离.
Nickel hexacyanoferrate (NiHCF) thin films were loaded within the porous channels of a carbon paper/graphite electrode by capillary chemical deposition. The composite film electrode was investigated for electrochemically controlled ion separation in an alkaline cation solution. The morphology and composition of the composite film electrode were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, infrared spectroscopy and X-ray photoelectron spectroscopy. Cyclic voltammetry was used to investigate the separation capacity, cycle life and regeneration ability of NiHCF film electrodes in 1 mol · L~(-1) KNO_3 and CsNO_3 solution. Results show that the composite film electrodes had a high ion exchange capacity, low diffusion resistance, good cycling stability and regeneration ability. It is suggested that the composite film electrodes are suitable for the selective separation of alkaline cations.
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