Corresponding Author

Xiao-gang HAO(xghao@tyut.edu.cn)


Electroactive nickel hexacyanoferrate (NiHCF) thin films were synthesized by cathodic deposition and investigated as electrochemically switched ion exchange (ESIX) materials for the separation of Y3+ from aqueous solutions. In 0.1 mol·L-1 Y(NO3)3 solution, cyclic voltammetry (CV) combined with electrochemical quartz crystal microbalance (EQCM) technique was used to investigate the electroactivity, reversibility of the film electrodes and the mechanism of ion exchange. The electrochemical behavior of NiHCF film electrodes was also compared with that in Sr(NO3)2 solutions. The ion selectivity of the film was investigated in 0.1 mol·L-1 solutions containing [Y(NO3)3 + Sr(NO3)2]. The elementary composition of NiHCF films in reduced and oxidized forms were also characterized by X-ray photoelectron spectroscopy (XPS). Experimental results show that the electroactive NiHCF films have reversible electrochemical behavior in aqueous solutions containing Y3+ and Sr2+, respectively. The NiHCF film electrodes displayed a high Y3+ selectivity in Y3+/Sr2+ binary mixtures and the Y3+ ions could be separated effectively from aqueous solutions by ESIX processes.

Graphical Abstract


nickel hexacyanoferrate films, electrochemically switched ion exchange, separation of yttrium ion, rare earth

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