Selective photofacilitated transport of sodium ions through liquid membranes: key factors in experimental design, transport results and comparison with a mathematical model

Goyette, Michelle L.; Longin, Teresa L.; Noble, Richard D.; Koval, Carl A.

doi:10.1016/s0376-7388(02)00504-5

Cited by 14 publications

(17 citation statements)

References 20 publications

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“…An additional example of a carrier and membrane transport system that is likely to perform much better under double than under single illumination recently appeared in a study by Goyette et al 17 In the experiment, the investigators developed a membrane transport cell specifically designed to test predictions of a model for transport in singly illuminated photofacilitated liquid membranes. They used a photoactive crown ether originally developed by Shinkai et al 15 as the carrier to selectively transport NaTFMS over LiTFMS and control the flux with light.…”

Section: Discussionmentioning

confidence: 99%

“…None of the investigators exploring singly illuminated membrane transport who use carriers suitable for doubly illuminated membrane transport report concerns about interference from carrier excited states. [8][9][10][11][12][13][14][15][16][17] Concentrations of the carrier and the complex are determined by reaction kinetics and by steady-state diffusion. Fick's second Figure 1.…”

Section: The Modelmentioning

confidence: 99%

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Simulations of Photomodulated Solute Transport in Doubly Illuminated Liquid Membranes Containing Photoactive Carriers

2005

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A steady-state model describing photofacilitated transport in liquid membranes under double illumination is presented. The model allows for the exploration of the effects of a wide range of thermodynamic and kinetic carrier properties on the control of photoinduced transport rates of solutes, called photomodulation. Most previous experimental and theoretical studies have explored the illumination of only the feed or sweep side of the membrane, while this study examines the effects of illuminating both sides simultaneously. Under double illumination, solute transport rates can be as much as five times greater than those measured in the dark and 2.5 times greater than rates obtained under single illumination. Carriers that are predominantly in the weakly binding form in the dark generally provide slightly better performance at lower light intensities than do carriers that are predominantly in the strongly binding form in the dark. The greatest enhancement in solute transport under double illumination is seen for carriers with very slow interconversion rate constants between the strongly and weakly binding forms. These results provide guidelines to help those studying photofacilitated membranes select or design photoactive molecules that will act as optimal carriers in liquid membranes under double illumination.

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Section: Discussionmentioning

confidence: 99%

Section: The Modelmentioning

confidence: 99%

Simulations of Photomodulated Solute Transport in Doubly Illuminated Liquid Membranes Containing Photoactive Carriers

2005

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“…Equilibrium favors dissociation of the complex, resulting in a high concentration of free solute, which then partitions into the sweep phase. This model is an extension of one developed for simulating solute transport and photopumping under single illumination, , and experimental testing of that model shows reasonable agreement with theoretical predictions . Table lists the parameters used in this manuscript.…”

Section: Introductionmentioning

confidence: 93%

“…Photofacilitated membranes contain carriers that are said to be photoactive in that light can drive conversion of the carriers into different physical configurations, allowing the solute to bind either strongly or weakly. Typically, either the feed side is illuminated to convert most of the weakly binding form of the carrier into the strongly binding form and enhance uptake of solute or the sweep side is illuminated to convert the strongly binding form of the carrier into the weakly binding form and promote release of the solute. − Several different chemically independent concentration gradients for individual species are simultaneously present within the membrane, and the concentration of solute inside the membrane at the sweep interface can become significantly greater than that in the bulk sweep solution. This allows for net transport of solute across the membrane even if the concentration of solute in the sweep solution is equal to or greater than that in the feed solution.…”

Section: Introductionmentioning

confidence: 99%

“…Many potential photoactive carriers are photoactive in both forms, with each form absorbing light at different wavelengths. − , This leads to the potential for doubly illuminated liquid membranes, and a few researchers have explored such membrane systems, both for photomodulation of transport rates − and for photopumping . However, the wide range of binding constants, interconversion rates between the strongly and the weakly binding forms, and other membrane properties used suggest a need for a more complete understanding of the factors important in photopumping.…”

Section: Introductionmentioning

confidence: 99%

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Simulations of Photopumping in Doubly Illuminated Liquid Membranes Containing Photoactive Carriers

2010

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A steady-state model used to simulate photofacilitated active transport against a concentration gradient, called photopumping, is described. Central to this model is the idea that the carrier can be in either a strongly binding or a weakly binding form and light can be used to control the interconversion rate between the two forms. Most experimental and theoretical studies have focused on systems in which only one side of the membrane is illuminated at a time to form singly illuminated liquid membranes. This study explores membranes in which both the feed and the sweep side are illuminated simultaneously with light of different wavelengths to form doubly illuminated liquid membranes. Doubly illuminated liquid membranes can sustain transport against concentration gradients in which the solute concentration in the sweep is a factor of 10 or more higher than that in the feed, while transport in singly illuminated liquid membranes falls off at lower concentration gradients. In addition, carrier properties that are important in single illumination such as the interconversion rates between the weakly and the strongly binding forms of the carrier are not important for doubly illuminated membranes, meaning that the range of suitable carriers will be much greater for double illumination than for single illumination.

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Liquid – Membrane Filters

Ghoshal

Saha

2015

Progress in Filtration and Separation

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Selective photofacilitated transport of sodium ions through liquid membranes: key factors in experimental design, transport results and comparison with a mathematical model

Cited by 14 publications

References 20 publications

Simulations of Photomodulated Solute Transport in Doubly Illuminated Liquid Membranes Containing Photoactive Carriers

Simulations of Photomodulated Solute Transport in Doubly Illuminated Liquid Membranes Containing Photoactive Carriers

Simulations of Photopumping in Doubly Illuminated Liquid Membranes Containing Photoactive Carriers

Liquid – Membrane Filters

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