Cross-sectional analysis of fouled SWRO membranes by STEM-EDS

Handle URI:
http://hdl.handle.net/10754/563302
Title:
Cross-sectional analysis of fouled SWRO membranes by STEM-EDS
Authors:
Aubry, Cyril; Khan, Muhammad; Behzad, Ali Reza; Anjum, Dalaver H.; Gutiérrez, Leonardo A.; Croue, Jean-Philippe
Abstract:
The intact cross-section of two fouled reverse osmosis membranes was characterized using a scanning transmission electron microscope (STEM) equipped with an electron energy dispersive spectroscope (EDS). Focused ion beam (FIB) was used to prepare a thin lamella of each membrane. These lamellas were then attached to a TEM grid for further STEM/EDS analysis. The foulant in sample A was mainly inorganic in nature and predominantly composed of alumino-silicate particles. These particles were surrounded by carbon at high concentrations, indicating the presence of organic materials. Iron was diffusely present in the cake layer and this could have enhanced the fouling process. The cake layer of membrane B was mainly consisted of organic matter (C, O, and N representing 95% of the total elemental composition) and organized in thin parallel layers. Small concentrations of Si, F, Na, Mg, and Cl were detected inside the active layer and support layer of the membrane. Due to the high sensitivity of the cake layer of membrane A to the electron beam, STEM/EDS line analyses might have been performed on large areas. On the other hand, the cake layer of sample B was resistant to the electron beam and the resolution of STEM/EDS was gradually improved until obtaining a resolution of 25. nm. © 2013 Elsevier B.V.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC); Advanced Nanofabrication, Imaging and Characterization Core Lab; Water Desalination & Reuse Research Cntr; Biological and Environmental Sciences and Engineering (BESE) Division; Core Labs
Publisher:
Elsevier BV
Journal:
Desalination
Issue Date:
Jan-2014
DOI:
10.1016/j.desal.2013.11.033
Type:
Article
ISSN:
00119164
Appears in Collections:
Articles; Advanced Nanofabrication, Imaging and Characterization Core Lab; Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorAubry, Cyrilen
dc.contributor.authorKhan, Muhammaden
dc.contributor.authorBehzad, Ali Rezaen
dc.contributor.authorAnjum, Dalaver H.en
dc.contributor.authorGutiérrez, Leonardo A.en
dc.contributor.authorCroue, Jean-Philippeen
dc.date.accessioned2015-08-03T11:45:15Zen
dc.date.available2015-08-03T11:45:15Zen
dc.date.issued2014-01en
dc.identifier.issn00119164en
dc.identifier.doi10.1016/j.desal.2013.11.033en
dc.identifier.urihttp://hdl.handle.net/10754/563302en
dc.description.abstractThe intact cross-section of two fouled reverse osmosis membranes was characterized using a scanning transmission electron microscope (STEM) equipped with an electron energy dispersive spectroscope (EDS). Focused ion beam (FIB) was used to prepare a thin lamella of each membrane. These lamellas were then attached to a TEM grid for further STEM/EDS analysis. The foulant in sample A was mainly inorganic in nature and predominantly composed of alumino-silicate particles. These particles were surrounded by carbon at high concentrations, indicating the presence of organic materials. Iron was diffusely present in the cake layer and this could have enhanced the fouling process. The cake layer of membrane B was mainly consisted of organic matter (C, O, and N representing 95% of the total elemental composition) and organized in thin parallel layers. Small concentrations of Si, F, Na, Mg, and Cl were detected inside the active layer and support layer of the membrane. Due to the high sensitivity of the cake layer of membrane A to the electron beam, STEM/EDS line analyses might have been performed on large areas. On the other hand, the cake layer of sample B was resistant to the electron beam and the resolution of STEM/EDS was gradually improved until obtaining a resolution of 25. nm. © 2013 Elsevier B.V.en
dc.publisherElsevier BVen
dc.subjectEDSen
dc.subjectFIBen
dc.subjectFouling layeren
dc.subjectReverse osmosis membraneen
dc.subjectSTEMen
dc.titleCross-sectional analysis of fouled SWRO membranes by STEM-EDSen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Laben
dc.contributor.departmentWater Desalination & Reuse Research Cntren
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentCore Labsen
dc.identifier.journalDesalinationen
dc.contributor.institutionEnvironmental Engineering, The Center of Advanced Materials for the Purification of Water with Systems, University of Illinois at Urbana-Champaign, United Statesen
kaust.authorAubry, Cyrilen
kaust.authorKhan, Muhammaden
kaust.authorBehzad, Ali Rezaen
kaust.authorAnjum, Dalaver H.en
kaust.authorCroue, Jean-Philippeen
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