Methylene Blue and Ascorbic Acid Aqueous Solutions Diffusion on the Nafion Polymer Membrane

Abstract

The paper presents results of studying the aqueous solution diffusion in various forms of the methylene blue and ascorbic acid onto the Nafion proton exchange polymer membrane using spectrometry in the IR 1--10 μm, near UV and visible 190--900 nm ranges. Methylene blue adsorption and desorption rate onto the membrane depends on intensity of the Coulomb interaction between the Mc⁺ molecules and the membrane sulfo-groups. Specifics in the diffusion processes of the membrane aqueous solutions are associated with regulation of the aqueous solution diffusion rate by the size of an exclusive zone appearing near the membrane surface, while its size depends on the water isotopic composition. Kinetics of the solution IR transmission is analyzed. The distilled water adsorption and desorption rates, the methylene blue oxidized form and the reduced colorless leuco-form of the methylene blue (MсH⁰) on the proton exchange membrane are close in values. Mc+ absorption rate into the Мс⁺ membrane is controlled by the solution isotopic composition. With a deuterium content of 157 ppm, the methylene blue adsorption rate is lower than in the case of deuterium content of 3 ppm. Reaction time constant of membrane adsorption of the Mc⁺ solution in this concentration is approximately 1.35 times higher for a solution prepared with the light water. Water desorption rate from the membrane surface during its drying is by 7 times lower in the case of deuterium content of 157 ppm in the methylene blue solution

Please cite this article in English as:

Bunkin N.F., Timchenko S.L., Zadorozhnyi E.N., et al. Methylene blue and ascorbic acid aqueous solutions diffusion on the Nafion polymer membrane. Herald of the Bauman Moscow State Technical University, Series Natural Sciences, 2024, no. 5 (116), pp. 71--96 (in Russ.). EDN: KXUXQC

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