High performance interlayer-free mesoporous cobalt oxide silica membranes for desalination applications

Elma, Muthia, Wang, David K., Yacou, Christelle, Motuzas, Julius and da Costa, Joao C. Diniz (2015) High performance interlayer-free mesoporous cobalt oxide silica membranes for desalination applications. Desalination, 365 308-315. doi:10.1016/j.desal.2015.02.034


Author Elma, Muthia
Wang, David K.
Yacou, Christelle
Motuzas, Julius
da Costa, Joao C. Diniz
Title High performance interlayer-free mesoporous cobalt oxide silica membranes for desalination applications
Journal name Desalination   Check publisher's open access policy
ISSN 0011-9164
1873-4464
Publication date 2015-06-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.desal.2015.02.034
Open Access Status Not yet assessed
Volume 365
Start page 308
End page 315
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2016
Language eng
Formatted abstract
Mesoporous cobalt oxide silica matrices and membranes were successfully prepared using a dual acid–base catalysed sol-gel and interlayer-free approach for desalination applications. The effects of cobalt addition (0–35 mol%) on the structure–property relationship of the silica materials and membrane performance were systematically studied as a function of feed salt concentration (0.3–7.5 wt.% NaCl) and temperature (22–60 °C). As cobalt concentration increases beyond 5 mol%, the concentration of tricobalt tetroxide and proportion of silica mesopores were found to increase within the matrices. Silica membranes with high amount of tricobalt tetroxide (35 mol%) were found to be highly mesoporous with water fluxes of 20, 11.3 and 7.7 kg m− 2 h− 1 for the 0.3, 3.5 and 7.5 wt.% solutions at 60 °C, respectively, with > 99.7% salt rejection at all times. This is attributed to the high pore volume (mesopores formation) and structural robustness of the silica network provided by the presence of tricobalt tetroxide. Even higher performance was achieved for low tricobalt tetroxide (1 mol%) silica membranes with water fluxes of 47.6 (0.3 wt.%) and 31.5 (3.5 wt.%) kg m− 2 h− 1 at 60 °C, respectively, though with reduced salt rejections of 90%.
Keyword Desalination
Base catalysed
Silica sal-gel
Cobalt oxide
Interlayer-free
Membrane
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 2016 Collection
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 9 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 12 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Sun, 14 Jun 2015, 00:30:30 EST by System User on behalf of School of Chemical Engineering