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231224s2013 xx |||||o 00| ||eng c |
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|a 10.1021/la304574e
|2 doi
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|a eng
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| 100 |
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|a Cheng, Chao
|e verfasserin
|4 aut
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|a Fundamentals of selective ion transport through multilayer polyelectrolyte membranes
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|c 2013
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 29.07.2013
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|a Date Revised 12.02.2013
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Membranes composed of multilayer poly(4-styrenesulfonate) (PSS)/protonated poly(allylamine) (PAH) films on porous alumina supports exhibit high monovalent/divalent cation selectivities. Remarkably, the diffusion dialysis K(+)/Mg(2+) selectivity is >350. However, in nanofiltration this selectivity is only 16, suggesting some convective ion transport through film imperfections. Under MgCl(2) concentration gradients across either (PSS/PAH)(4)- or (PSS/PAH)(4)PSS-coated alumina, transmembrane potentials indicate Mg(2+) transference numbers approaching 0. The low Mg(2+) transference numbers with both polycation- and polyanion-terminated films likely stem from exclusion of Mg(2+) due to its large size or hydration energy. However, these high anion/cation selectivities decrease as the solution ionic strength increases. In nanofiltration, the high asymmetry of membrane permeabilities to Mg(2+) and Cl(-) creates transmembrane diffusion potentials that lead to negative rejections (the ion concentration in the permeate is larger than in the feed) as low as -200% for trace monovalent cations such as K(+) and Cs(+). Moreover, rejection becomes more negative as the mobility of the trace cation increases. Knowledge of single-ion permeabilities is vital for predicting the performance of polyelectrolyte films in the separation and purification of mixed salts
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|a Journal Article
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|a Yaroshchuk, Andriy
|e verfasserin
|4 aut
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| 700 |
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|a Bruening, Merlin L
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 29(2013), 6 vom: 12. Feb., Seite 1885-92
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|x 1520-5827
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| 773 |
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|g volume:29
|g year:2013
|g number:6
|g day:12
|g month:02
|g pages:1885-92
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|u http://dx.doi.org/10.1021/la304574e
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