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Nanofiltration of multi-ion solutions: Quantitative control of concentration polarization and interpretation by solution-diffusion-electro-migration model

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Fernández de Labastida Ventura, MarcosMés informacióMés informacióMés informació
Yaroshchuk, AndriyMés informacióMés informacióMés informació
Document typeArticle
Defense date2021-04-01
PublisherMultidisciplinary Digital Publishing Institute (MDPI)
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 4.0 International
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 4.0 International
Abstract
For effective use of advanced engineering models of nanofiltration quality of experimental input is crucial, especially in electrolyte mixtures where simultaneous rejections of various ions may be very different. In particular, this concerns the quantitative control of concentration polarization (CP). This work used a rotating disklike membrane test cell with equally accessible membrane surface, so the CP extent was the same over the membrane surface. This condition, which is not satisfied in the conventional membrane test cell, made possible correcting for CP easily even in multi-ion systems. Ion rejections were studied experimentally for several dominant salts (NaCl, MgCl2, Na2SO4 and MgSO4) and trace ions (Na+, NH4+, Cl- and NO3-) using NF270 membrane. The solution–diffusion–electro–migration model was used to obtain ion permeances from the experimental measurements. The model could well fit the experimental data except in the case of NH4+. The correlations between the ion permeances and type of dominant salt are discussed in the context of the established mechanisms of NF such as Donnan and dielectric exclusion. The obtained information contributes to the systematic transport characterization of NF membranes and may be ultimately useful for computational fluid dynamics simulations of the performance of the membranes in various applications.
CitationFernandez de Labastida, M.; Yaroshchuk, A. Nanofiltration of multi-ion solutions: Quantitative control of concentration polarization and interpretation by solution-diffusion-electro-migration model. "Membranes", 1 Abril 2021, vol. 11, núm. 4, p. 272:1-272:12. 
URIhttp://hdl.handle.net/2117/351430
DOI10.3390/membranes11040272
ISSN2077-0375
Publisher versionhttps://www.mdpi.com/2077-0375/11/4/272
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  • R2EM - Resource Recovery and Environmental Management - Articles de revista [155]
  • Departament d'Enginyeria Química - Articles de revista [1.990]
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