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Experimental energy barriers to anions transporting through nanofiltration membranes

Richards, Laura A.; Richards, Bryce; Corry, Ben; Schafer, Andrea I.

Description

Environmentally relevant contaminants fluoride, chloride, nitrate, and nitrite face Arrhenius energy barriers during transport through nanofiltration (NF) membranes. The energy barriers were quantified using crossflow filtration experiments and were in the range of 7-17 kcal·mol-1, according to ion type and membrane type (Filmtec NF90 and NF270). Fluoride faced a comparatively high energy barrier for both membranes. This can be explained by the strong hydration energy of fluoride rather than...[Show more]

dc.contributor.authorRichards, Laura A.
dc.contributor.authorRichards, Bryce
dc.contributor.authorCorry, Ben
dc.contributor.authorSchafer, Andrea I.
dc.date.accessioned2015-12-13T22:16:35Z
dc.identifier.issn0013-936X
dc.identifier.urihttp://hdl.handle.net/1885/70933
dc.description.abstractEnvironmentally relevant contaminants fluoride, chloride, nitrate, and nitrite face Arrhenius energy barriers during transport through nanofiltration (NF) membranes. The energy barriers were quantified using crossflow filtration experiments and were in the range of 7-17 kcal·mol-1, according to ion type and membrane type (Filmtec NF90 and NF270). Fluoride faced a comparatively high energy barrier for both membranes. This can be explained by the strong hydration energy of fluoride rather than other ion properties such as bare ion radius, fully hydrated radius, Stokes radius, diffusion coefficient, or ion charge. The energy barrier for fluoride decreased with pressure, indicating an impact of directional force on energy barriers. The influence of temperature-induced pore radius variability and viscosity on energy barriers was considered. The novel link between energy barriers and ion properties emphasizes the importance of ion hydration and/or partial dehydration mechanisms in determining transport in NF.
dc.publisherAmerican Chemical Society
dc.sourceEnvironmental Science and Technology
dc.subjectKeywords: Arrhenius energies; Cross flow filtration; Directional forces; High-energy barriers; Hydrated radius; Hydration energies; Ion charge; Ion hydration; Ion radii; Ion types; Ion-properties; Membrane types; Partial dehydrations; Pore radius; Stokes radius; Te
dc.titleExperimental energy barriers to anions transporting through nanofiltration membranes
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume47
dc.date.issued2013
local.identifier.absfor091202 - Composite and Hybrid Materials
local.identifier.ariespublicationf5625xPUB2475
local.type.statusPublished Version
local.contributor.affiliationRichards, Laura A., Heriot-Watt University
local.contributor.affiliationRichards, Bryce, Heriot-Watt University
local.contributor.affiliationCorry, Ben, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationSchafer, Andrea I., University of Edinburgh
local.description.embargo2037-12-31
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage1968
local.bibliographicCitation.lastpage1976
local.identifier.doi10.1021/es303925r
dc.date.updated2016-02-24T08:59:09Z
local.identifier.scopusID2-s2.0-84874098556
local.identifier.thomsonID000315326700024
CollectionsANU Research Publications

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