When i run my experiment using EMIM ionic liquid, the ions are moving when i apply electric field. However, when i use A336, it is not moving. Any idea why ?
Dear Hemamalini Rawindran,
Polymer membranes and porous materials absorb ionic liquids, causing changes in ionic conductivity and mobility. Polymer inclusion membranes (PIMs) with ionic liquids facilitate ion movement by acting as proton exchange membranes, improving efficiency in processes like microbial fuel cells and electrodialysis, and by enhancing ion conductivity and selectivity for ion transport based on the interaction between the ionic liquid and the polymer matrix.
Best Regards
Dear Prof,
Thank you for the enlightenment.
I would like to share my hiccup during experiment. I am currently running an experiment for ion migration. While using EMIM ionic liquid, the ions are moving under electric current. However, when i use A336, it is not moving. Could Prof shed some light on this too, please? Thank you Prof
Hemamalini Rawindran
N-Methyl-N, N, N-trioctylammonium chloride (A336) is a large molecule. Therefore, it does not pass through the pores of the membranes and therefore does not move.
Polymer inclusion membranes (PIMs) are used to selectively transport ions, and when combined with ionic liquids, they create a unique system for ion movement. The PIM acts as a barrier, allowing only specific ions to pass through. The ionic liquid helps enhance the ion transport by acting as a carrier for the ions. Together, they create a dynamic system for ion movement.
Dear Doctor
Go To
Ionic liquid-based polymer inclusion membranes for metal ions extraction and recovery: Fundamentals, considerations, and prospects
Shuaifei Zhao , Akbar Samadi , Zhuan Wang , Jennifer M. Pringle , Yang Zhang , Spas D. Kolev
Chemical Engineering Journal
Volume 481, 1 February 2024, 148792
"Heavy metal removal from wastewater and valuable metal recovery from electronic waste are of critical environmental and economic significance. Separation based on the use of polymer inclusion membranes (PIMs) with the advantage of simultaneous extraction and stripping has emerged as a promising approach for efficient and selective metal ion removal and/or recovery from wastewaters or electronic waste. However, the conventional extractants used in PIMs are often not selective to certain metal ions, and are highly volatile and toxic, leading to low extraction efficiency and significant environmental concerns. Ionic liquids (ILs) have negligible vapor pressure and can be purposely designed for extraction of specific ions. In addition, ILs can be multifunctional by purpose design, for instance, having the functions of both extractants and plasticizers. Therefore, the marriage of PIMs and ILs (i.e., IL-based PIMs) has been highly attractive for selective extraction and recovery of various metal ions.
The use of ILs in PIMs allows for the design of selective and multifunctional extractants, leading to improved extraction efficiency and higher selectivity towards target chemical species. IL-based PIMs have shown promising results in the selective extraction of various metal ions, including precious metal ions, ions of rare earth elements, and other technology-critical elements, from complex matrices."
Hemamalini Rawindran
Perhaps your dye has a negative ion sign. It interacts with A336 and forms an even larger molecule. When you diluted A336, the number of such molecules decreased and the number of free dye molecules increased.
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