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Fundamentals of selective ion transport through multilayer polyelectrolyte membranes
dc.contributor.author | Cheng, Chao |
dc.contributor.author | Yaroshchuk, Andriy |
dc.contributor.author | Bruening, Merlin L. |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament d'Enginyeria Química |
dc.date.accessioned | 2013-04-09T10:30:57Z |
dc.date.created | 2013-01-14 |
dc.date.issued | 2013-01-14 |
dc.identifier.citation | Cheng, C.; Yaroshchuk, A.; Bruening, M. Fundamentals of selective ion transport through multilayer polyelectrolyte membranes. "Langmuir", 14 Gener 2013, vol. 29, núm. 6, p. 1885-1892. |
dc.identifier.issn | 0743-7463 |
dc.identifier.uri | http://hdl.handle.net/2117/18723 |
dc.description.abstract | Membranes composed of multilayer poly(4-styrenesul- fonate) (PSS)/protonated poly(allylamine) (PAH) fi lms on porous alumina supports exhibit high monovalent/divalent cation selectivities. Remarkably, the di ff usion dialysis K + /Mg 2+ selectivity is >350. However, in nano fi ltration this selectivity is only 16, suggesting some convective ion transport through fi lm 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 fi lms 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 nano fi ltration, the high asymmetry of membrane permeabilities to Mg 2+ and Cl − creates transmembrane di ff usion 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 fi lms in the separation and puri fi cation of mixed salts. |
dc.format.extent | 8 p. |
dc.language.iso | eng |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Spain |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
dc.subject | Àrees temàtiques de la UPC::Enginyeria química |
dc.subject.lcsh | Membranes (Technology) |
dc.subject.other | Ion selective membranes |
dc.subject.other | Alumina |
dc.subject.other | Chemical contamination |
dc.subject.other | Dialysis |
dc.subject.other | Ionic strength |
dc.subject.other | Multilayer films |
dc.subject.other | Multilayers |
dc.subject.other | Nanofiltration |
dc.subject.other | Polyelectrolytes |
dc.subject.other | Positive ions |
dc.title | Fundamentals of selective ion transport through multilayer polyelectrolyte membranes |
dc.type | Article |
dc.subject.lemac | Membranes (Tecnologia) -- Separació |
dc.identifier.doi | 10.1021/la304574e |
dc.description.peerreviewed | Peer Reviewed |
dc.rights.access | Restricted access - publisher's policy |
local.identifier.drac | 11796265 |
dc.description.version | Postprint (published version) |
dc.date.lift | 10000-01-01 |
local.citation.author | Cheng, C.; Yaroshchuk, A.; Bruening, M. |
local.citation.publicationName | Langmuir |
local.citation.volume | 29 |
local.citation.number | 6 |
local.citation.startingPage | 1885 |
local.citation.endingPage | 1892 |
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