Preparation and Application of Multirow Graphite Cores NiHCF Film Electrodes for Electrochemically Controlled Cesium Separation

The electractive nickel hexacyanoferrate (NiHCF) thin films were synthesized on the multirow graphite substrates which were composed of 27 graphite cores by a cathodical deposition. The multirow graphite core electrodes were investigated as Electrochemically Controlled Ion Separation (ECIS) materials for the selective separation of cesium (Cs⁺). In the simulation solution containing Cs⁺, Cs⁺ are reversibly intercalated and deintercalated from the matrix by electrochemical modulation of the reduced and oxidized states of the film. This paper presents results of experiments on the development of a flow system for the Cs⁺ separation. Ion Chromatography (IC) was used to determine the effect of experimental conditions on the Cs⁺ selective separation for the NiHCF thin film, such as the initial [Cs⁺] concentration, surface state, regenerability, and flow velocity on the Cs⁺ selective separation for the NiHCF thin film .The experiment results show that the Cs⁺ entering into the NiHCF film in oxidized state increase with time. With increasing amounts of Cs⁺ in solution, the [Cs⁺] entering into NiHCF film are larger while in the corresponding solution the removing rate of Cs⁺ is also larger. It is demonstrated that the NiHCF film on the substrate of multiple sequential graphite cores have good ECIS performance and regenerability.