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Open AccessArticle

Custom-Made Ion Exchange Membranes at Laboratory Scale for Reverse Electrodialysis

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CIATEC A.C., Centro de Innovación Aplicada en Tecnologías Competitivas, Omega 201, Col. Industrial Delta, León, Guanajuato 37545, Mexico
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Departamento de Ingeniería en Control y Automatización, Escuela Superior de Ingeniería Mecánica y Eléctrica-Zacatenco, Instituto Politécnico Nacional, UPALM, Av. Politécnico S/N, Col. Zacatenco, Alcaldía Gustavo A. Madero, Ciudad de México 07738, Mexico
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CONACYT-CIATEC A.C., Centro de Innovación Aplicada en Tecnologías Competitivas, Omega 201, Col. Industrial Delta, León, Guanajuato 37545, Mexico
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Author to whom correspondence should be addressed.
Membranes 2019, 9(11), 145; https://doi.org/10.3390/membranes9110145
Received: 6 September 2019 / Revised: 19 October 2019 / Accepted: 23 October 2019 / Published: 4 November 2019
(This article belongs to the Section Membrane Preparation and Characterization)
Salinity gradient power is a renewable, non-intermittent, and neutral carbon energy source. Reverse electrodialysis is one of the most efficient and mature techniques that can harvest this energy from natural estuaries produced by the mixture of seawater and river water. For this, the development of cheap and suitable ion-exchange membranes is crucial for a harvest profitability energy from salinity gradients. In this work, both anion-exchange membrane and cation-exchange membrane based on poly(epichlorohydrin) and polyvinyl chloride, respectively, were synthesized at a laboratory scale (255 c m 2) by way of a solvent evaporation technique. Anion-exchange membrane was surface modified with poly(ethylenimine) and glutaraldehyde, while cellulose acetate was used for the cation exchange membrane structural modification. Modified cation-exchange membrane showed an increase in surface hydrophilicity, ion transportation and permselectivity. Structural modification on the cation-exchange membrane was evidenced by scanning electron microscopy. For the modified anion exchange membrane, a decrease in swelling degree and an increase in both the ion exchange capacity and the fixed charge density suggests an improved performance over the unmodified membrane. Finally, the results obtained in both modified membranes suggest that an enhanced performance in blue energy generation can be expected from these membranes using the reverse electrodialysis technique. View Full-Text
Keywords: ion exchange membranes; solvent evaporation; blue energy; reverse electrodialysis; laboratory-scale membranes ion exchange membranes; solvent evaporation; blue energy; reverse electrodialysis; laboratory-scale membranes
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Villafaña-López, L.; Reyes-Valadez, D.M.; González-Vargas, O.A.; Suárez-Toriello, V.A.; Jaime-Ferrer, J.S. Custom-Made Ion Exchange Membranes at Laboratory Scale for Reverse Electrodialysis. Membranes 2019, 9, 145.

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