Long term pervaporation desalination of tubular MFI zeolite membranes

Drobek, Martin, Yacou, Christelle, Motuzas, Julius, Julbe, Anne, Ding, Liping and da Costa, Joao C. Diniz (2012) Long term pervaporation desalination of tubular MFI zeolite membranes. Journal of Membrane Science, 415-416 816-823. doi:10.1016/j.memsci.2012.05.074

Author Drobek, Martin
Yacou, Christelle
Motuzas, Julius
Julbe, Anne
Ding, Liping
da Costa, Joao C. Diniz
Title Long term pervaporation desalination of tubular MFI zeolite membranes
Journal name Journal of Membrane Science   Check publisher's open access policy
ISSN 0376-7388
Publication date 2012-10
Sub-type Article (original research)
DOI 10.1016/j.memsci.2012.05.074
Volume 415-416
Start page 816
End page 823
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2013
Language eng
Formatted abstract
Silicalite-1 (S-1) and ZSM-5 membranes prepared by secondary growth on tubular ceramic supports were tested using a pervaporation set up for the desalination of aqueous solutions containing NaCl in concentrations corresponding to brackish (0.3-1wt%), sea (3.5wt%) and brine (7.5-15wt%) water. ZSM-5 membranes delivered higher water fluxes when compared with S-1 membranes due to enhanced hydrophilicity of the Al-rich zeolite structure leading to fluxes as high as 11.5kgm -2h -1 for 0.3wt% NaCl feed solutions at 75°C. At higher salt concentration the water flux decreased alongside with the salt rejection rate, however the hydrophilic ZMS-5 membrane became more susceptible to performance loss, particularly at high temperatures. Detailed stability experiments carried out for up to 560h showed the dissolution of both S-1 and ZSM-5 top layers. This was attributed to the combined effects of ion exchange and water dissolution mechanisms. Interesting though, the MFI structure zeolite was still observed on the XRD patterns whilst EDX depth profile showed the presence of silica up to 30μm depth into the support. These results suggest the formation/infiltration of a compact amorphous phase in the substrate, derived from the aggregation of the dissolved silicate species and possibly together with the arrangement of MFI nano-slabs during the desalination tests. Despite generating lower water fluxes, the S-1 membrane exhibited relatively high robustness under the long term testing conditions which included temperature cycling, delivering salt rejections from initial >99% to <80% at the end of the testing period (560h).
Keyword Desalination
Zeolite membranes
Assisted Hydrothermal Treatment
Silica Membranes
Nonosmotic Desalination
Inorganic Membranes
Rapid Synthesis
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2013 Collection
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Citation counts: TR Web of Science Citation Count  Cited 30 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 37 times in Scopus Article | Citations
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Created: Thu, 15 Nov 2012, 11:36:51 EST by System User on behalf of School of Chemical Engineering