Competitive Adsorption of Ions at the Oil-Water Interface: A Possible Mechanism Underlying the Separation Selectivity for Liquid-Liquid Solvent Extraction

Pan Sun; Kun Huang; Huizhou Liu

doi:10.1021/acs.langmuir.8b02691

Competitive Adsorption of Ions at the Oil-Water Interface: A Possible Mechanism Underlying the Separation Selectivity for Liquid-Liquid Solvent Extraction

Pan Sun, Kun Huang, Huizhou Liu

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

Adsorption, especially competitive adsorption of ions at the interfaces, governs a wealth of physicochemical processes. Understanding the mechanism behind these interfacial behaviors is crucial for developing novel strategies to intensify reactions or transfer processes. Herein, as an example, we found that in the case of liquid-liquid transport of V(V) and Cr(VI) ions, the competitive adsorption of V(V) and Cr(VI) ions against coexisting SO₄ ^2- ions at the oil-water interface exhibits a significant impact on the selective separation behaviors of V(V) and Cr(VI) ions. The transport of Cr(VI) ions would be hindered by adding Na₂SO₄ into the aqueous solutions because of the competitive adsorption of SO₄ ^2- ions at the interface being stronger than that of Cr(VI) ions, whereas the transport of V(V) ions would not be affected because of the stronger affinity of V(V) ions to the interfaces compared to that of SO₄ ^2- ions. The present work provides new inspirations for developing efficient strategies to improve the separation efficiency of target ions with similar physic-chemical properties by regulating their adsorption behaviors at the interface. It is beneficial to get a deeper understanding into the microscopic nature of competitive adsorption behaviors of ions at interfaces from the interface-molecular level.

Original language	English
Pages (from-to)	13155-13161
Number of pages	7
Journal	Langmuir
Volume	34
Issue number	44
DOIs	https://doi.org/10.1021/acs.langmuir.8b02691
State	Published - Nov 6 2018
Externally published	Yes

Funding

This work was financially supported by the National Natural Science Foundation of China (nos. 51574213 and 51074150), and the Key Project of Chinese National Programs for Fundamental Research and Development (973 Program nos. 2013CB632602, 2012CBA01203). We thank the Supercomputing Center of Chinese Academy of Sciences for allowing us to use the ScGrid for theoretical calculations.

Funders	Funder number
Chinese National Programs for Fundamental Research and Development	2012CBA01203, 2013CB632602
National Natural Science Foundation of China	51574213, 51074150

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title = "Competitive Adsorption of Ions at the Oil-Water Interface: A Possible Mechanism Underlying the Separation Selectivity for Liquid-Liquid Solvent Extraction",

abstract = "Adsorption, especially competitive adsorption of ions at the interfaces, governs a wealth of physicochemical processes. Understanding the mechanism behind these interfacial behaviors is crucial for developing novel strategies to intensify reactions or transfer processes. Herein, as an example, we found that in the case of liquid-liquid transport of V(V) and Cr(VI) ions, the competitive adsorption of V(V) and Cr(VI) ions against coexisting SO4 2- ions at the oil-water interface exhibits a significant impact on the selective separation behaviors of V(V) and Cr(VI) ions. The transport of Cr(VI) ions would be hindered by adding Na2SO4 into the aqueous solutions because of the competitive adsorption of SO4 2- ions at the interface being stronger than that of Cr(VI) ions, whereas the transport of V(V) ions would not be affected because of the stronger affinity of V(V) ions to the interfaces compared to that of SO4 2- ions. The present work provides new inspirations for developing efficient strategies to improve the separation efficiency of target ions with similar physic-chemical properties by regulating their adsorption behaviors at the interface. It is beneficial to get a deeper understanding into the microscopic nature of competitive adsorption behaviors of ions at interfaces from the interface-molecular level.",

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Competitive Adsorption of Ions at the Oil-Water Interface: A Possible Mechanism Underlying the Separation Selectivity for Liquid-Liquid Solvent Extraction

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