Document Detail

Experimental energy barriers to anions transporting through nanofiltration membranes.
MedLine Citation:
PMID:  23298263     Owner:  NLM     Status:  MEDLINE    
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 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.
Laura A Richards; Bryce S Richards; Ben Corry; Andrea I Schäfer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2013-02-08
Journal Detail:
Title:  Environmental science & technology     Volume:  47     ISSN:  1520-5851     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-02-19     Completed Date:  2013-09-17     Revised Date:  2013-09-25    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1968-76     Citation Subset:  IM    
School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom.
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MeSH Terms
Anions / chemistry*
Membranes, Artificial*
Water / chemistry
Reg. No./Substance:
0/Anions; 0/Membranes, Artificial; 7732-18-5/Water
Comment In:
Environ Sci Technol. 2013 Aug 6;47(15):8985-6   [PMID:  23808342 ]
Environ Sci Technol. 2013 Aug 6;47(15):8987-8   [PMID:  23808374 ]

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