Preparation, characterization and performance of templated silica membranes in non-osmotic desalination

Ladewig, Bradley P., Tan, Ying Han, Lin, Chun Xiang C., Ladewig, Katharina, Diniz da Costa, Joao C. and Smart, Simon (2011) Preparation, characterization and performance of templated silica membranes in non-osmotic desalination. Materials, 4 5: 845-856. doi:10.3390/ma4040845


Author Ladewig, Bradley P.
Tan, Ying Han
Lin, Chun Xiang C.
Ladewig, Katharina
Diniz da Costa, Joao C.
Smart, Simon
Title Preparation, characterization and performance of templated silica membranes in non-osmotic desalination
Journal name Materials   Check publisher's open access policy
ISSN 1996-1944
Publication date 2011-05
Sub-type Article (original research)
DOI 10.3390/ma4040845
Open Access Status DOI
Volume 4
Issue 5
Start page 845
End page 856
Total pages 12
Place of publication Basel, Switzerland
Publisher MDPI
Collection year 2012
Language eng
Formatted abstract
In this work we investigate the potential of a polyethylene glycol-polypropylene glycol- polyethylene glycol, tri-block copolymer as a template for a hybrid carbon/silica membrane for use in the non-osmotic desalination of seawater. Silica samples were loaded with varying amounts of tri-block copolymer and calcined in a vacuum to carbonize the template and trap it within the silica matrix. The resultant xerogels were analyzed with FTIR, Thermogravimetric analysis (TGA) and N2 sorption techniques, wherein it was determined that template loadings of 10 and 20% produced silica networks with enhanced pore volumes and appropriately sized pores for desalination. Membranes were created via two different routes and tested with feed concentrations of 3, 10 and 35 ppk of NaCl at room temperature employing a transmembrane pressure drop of <1 atm. All membranes demonstrated a salt rejection capacity of >85% (in most cases >95%) and fluxes higher than 1.6 kg m−2 h−1. Furthermore, the carbonized templated membranes displayed equal or improved performance compared to similarly prepared non-templated silica membranes, with the best results of a flux of 3.7 kg m−2 h−1 with 98.5% salt rejection capacity, exceeding previous literature reports. In addition, the templated silica membranes exhibited superior hydrostability demonstrating their potential for long-term operation.  
Keyword Desalination
Inorganic membranes
Silica
Carbonized templates
Surfactants
Salt rejection
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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