Citation: MENG Yao, ZHANG Jian-Wei, YUE Yun-Pei, HE Jun-Hui, LI Yan. Analysis of Facilitated Ion Transfer Across Liquid-Liquid Interfaces Using Collision Electrochemisty[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(11): 1535-1541. doi: 10.19756/j.issn.0253-3820.201252 shu

Analysis of Facilitated Ion Transfer Across Liquid-Liquid Interfaces Using Collision Electrochemisty

MENG Yao ^1,, ,
ZHANG Jian-Wei ² ,
YUE Yun-Pei ¹ ,
HE Jun-Hui ¹ ,
LI Yan ²

1.
School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China;
2.
Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, China

Corresponding author: MENG Yao, mengyao0116@nwpu.edu.cn
Received Date: 4 May 2020
Revised Date: 21 May 2020

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 21705128, 21675124) and the Natural Science Basic Research Plan in Shaanxi Province of China (No. 2018JQ2006).

An electrochemical method was developed to analyze the alkali metal ion transfer across the water/1,2-dichloroethane interfaces facilitated by dibenzo-18-crown-6 ether (DB18C6) by observing the collisions of single emulsion droplets on an ultramicroelectrode (UME). The water-in-oil emulsion droplets were stabilized by an ionic liquid of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imides, in which a highly hydrophilic redox probe of K₃Fe(CN)₆/K₄Fe(CN)₆ was used. When the droplets collided with the UME that was biased at a potential to drive the oxidation reaction of 0.05 mol/L[Fe(CN)₆]^4-, the current spikes could be observed only with the addition of DB18C6. It was suggested that the DB18C6 as K⁺ ionophore facilitated the K⁺ transfer from the water to the oil to maintain charge balance during droplet electrolysis. As more K⁺ ionophores were added, the integrated charge of the current spikes showed a rising trend in general because of the ionophore to lower the Gibbs energy of ion transfer. Further collision experiments were conducted to investigate transfer of Na⁺ and K⁺ cations facilitated by the DB18C6. The order in which the ‘voltammetric’ oxidation waves appeared indicated that the ionophore of DB18C6 was more efficient in carrying K⁺ across the water/1,2-dichloroethane interface. Thereby, the collision electrochemistry is a convenient and effective mean to study the ion selectivity of ionophore.
- Facilitated ion transfer,
- Ionophore,
- Water-in-oil emulsion droplet,
- Single-particle collision electrochemistry
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