A potential-responsive ion-pump system based on nickel hexacyanoferrate film for selective extraction of cesium ions

doi:10.1016/j.cjche.2023.04.007

Abstract

Abstract: A nickel hexacyanoferrate (NiHCF) film electrode was prepared with NiHCF, conductive carbon black, and polyvinylidene difluoride, which was coated on graphite plate substrate for selective extraction of Cs⁺ ions by using electrochemically switched ion exchange (ESIX) technology. A potential-responsive ion-pump system for efficient extraction of Cs⁺ ions was designed, and the effect of wet film thicknesses, charging modes, flow rates, and chamber widths on Cs⁺ ions extraction performance was investigated. In the system, the adsorption capacity and removal percentage of Cs⁺ ions on the NiHCF film electrode reached as high as 147.69 mg·g^-1 and 92.47%, respectively. Furthermore, the NiHCF film electrode showed high selectivity for Cs⁺ ions and stability. After seven cycles of adsorption/desorption, the desorption percentage could reach about 100%. The excellent Cs⁺ extraction performance should be attributed to the strong driving force produced by the potential-responsive ion-pumping effect in the ESIX process, as well as the low ion transfer resistance of the film electrode which is caused by the special crystal structure of NiHCF. In addition, the NiHCF film electrode was implemented to work together with the bismuth oxybromide (BiOBr) film electrode to accomplish the simultaneous extraction of Cs⁺ and Br^-. And the adsorption capacity and removal percentage of Br^- ions on the BiOBr film electrode reached 69.53 mg·g^-1 and 77.32%, correspondingly. It is expected that such a potential-responsive ion-pump system based on NiHCF and BiOBr film electrodes could be used for the selective extraction and concentration of Cs⁺ and Br^- ions from salt lake brine..

Key words: Electrochemically switched ion exchange, Potential-responsive ion-pump system, NiHCF film electrode, Cesium ions

摘要： A nickel hexacyanoferrate (NiHCF) film electrode was prepared with NiHCF, conductive carbon black, and polyvinylidene difluoride, which was coated on graphite plate substrate for selective extraction of Cs⁺ ions by using electrochemically switched ion exchange (ESIX) technology. A potential-responsive ion-pump system for efficient extraction of Cs⁺ ions was designed, and the effect of wet film thicknesses, charging modes, flow rates, and chamber widths on Cs⁺ ions extraction performance was investigated. In the system, the adsorption capacity and removal percentage of Cs⁺ ions on the NiHCF film electrode reached as high as 147.69 mg·g^-1 and 92.47%, respectively. Furthermore, the NiHCF film electrode showed high selectivity for Cs⁺ ions and stability. After seven cycles of adsorption/desorption, the desorption percentage could reach about 100%. The excellent Cs⁺ extraction performance should be attributed to the strong driving force produced by the potential-responsive ion-pumping effect in the ESIX process, as well as the low ion transfer resistance of the film electrode which is caused by the special crystal structure of NiHCF. In addition, the NiHCF film electrode was implemented to work together with the bismuth oxybromide (BiOBr) film electrode to accomplish the simultaneous extraction of Cs⁺ and Br^-. And the adsorption capacity and removal percentage of Br^- ions on the BiOBr film electrode reached 69.53 mg·g^-1 and 77.32%, correspondingly. It is expected that such a potential-responsive ion-pump system based on NiHCF and BiOBr film electrodes could be used for the selective extraction and concentration of Cs⁺ and Br^- ions from salt lake brine..

关键词: Electrochemically switched ion exchange, Potential-responsive ion-pump system, NiHCF film electrode, Cesium ions

Guoliang Zeng, Danni Ye, Xingfang Zhang, Fengfeng Gao, Xiaogang Hao, Jun Li, Zhong Liu. A potential-responsive ion-pump system based on nickel hexacyanoferrate film for selective extraction of cesium ions[J]. Chinese Journal of Chemical Engineering, 2023, 63(11): 51-62.

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