Cobalt oxide silica membranes for desalination

Lin, Chun Xiang C., Ding, Li Ping, Smart, Simon and da Costa, Joao C. Diniz (2012) Cobalt oxide silica membranes for desalination. Journal of Colloid and Interface Science, 368 1: 70-76. doi:10.1016/j.jcis.2011.10.041

Author Lin, Chun Xiang C.
Ding, Li Ping
Smart, Simon
da Costa, Joao C. Diniz
Title Cobalt oxide silica membranes for desalination
Journal name Journal of Colloid and Interface Science   Check publisher's open access policy
ISSN 0021-9797
Publication date 2012-02-15
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.jcis.2011.10.041
Volume 368
Issue 1
Start page 70
End page 76
Total pages 7
Place of publication Maryland Heights, MO, United States
Publisher Academic Press
Collection year 2012
Language eng
Formatted abstract
This work shows for the first time the potential of cobalt oxide silica (CoOxSi) membranes for desalination of brackish (1 wt.% NaCl), seawater (3.5 wt.% NaCl) and brine (7.5–15 wt.% NaCl) concentrations at feed temperatures between 25 and 75 °C. CoOxSi xerogels were synthesised via a sol–gel method including TEOS, cobalt nitrate hydrate and peroxide. Initial hydrothermal exposure (<2 days) of xerogels prepared with various pH (3–6) resulted in densification of the xerogel via condensation reactions within the silica matrix, with the xerogel synthesised at pH 5 the most resistant. Subsequent exposure was not found to significantly alter the pore structure of the xerogels, suggesting they were hydrostable and that the pore sizes remained at molecular sieving dimensions. Membranes were then synthesised using identical sol–gel conditions to the xerogel samples and testing showed that elevated feed temperatures resulted in increased water fluxes, whilst increasing the saline feed concentration resulted in decreased water fluxes. The maximum flux observed was 1.8 kg m−2 h−1 at 75 °C for a 1 wt.% NaCl feed concentration. The salt rejection was consistently in excess of 99%, independent of either the testing temperature or salt feed concentration.
Keyword Cobalt oxide silica membranes
Molecular sieving
Water flux
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 25 October 2011

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2012 Collection
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Citation counts: TR Web of Science Citation Count  Cited 20 times in Thomson Reuters Web of Science Article | Citations
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