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Issue 45, 2014
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Insight into the pore tuning of triazine-based nitrogen-rich organoalkoxysilane membranes for use in water desalination

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Abstract

A promising new triazine-based nitrogen-rich organosilica (TTESPT) membrane has been developed for molecular separation processes in gas (gas separation) and liquid phases (reverse osmosis (RO)). By adjusting the H2O/TTESPT molar ratio, we found a promising technique for tuning the pore network of TTESPT membranes. An increase in the H2O/TTESPT molar ratio from 60 to 240 fully hydrolyzed all the ethoxide groups in the TTESPT membrane, which reduced the size of the pores in the silica pore network. A TTESPT membrane with a high H2O/TTESPT molar ratio exhibited a high degree of selectivity for H2/SF6 (greater than 4000) at a permeation temperature of 200 °C. This membrane also demonstrated high sodium chloride (NaCl) rejection (>98.5%) with water permeability of >1 × 10−12 m3 m−2 s−1 Pa−1 under operating conditions of 1 MPa and 60 °C during a RO experiment. As the operating temperature was increased from 25 to 60 °C, the NaCl rejection was constant without displaying the characteristic flux deterioration. This showed that the membrane retained a stable hybrid network structure.

Graphical abstract: Insight into the pore tuning of triazine-based nitrogen-rich organoalkoxysilane membranes for use in water desalination

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Supplementary files

Article information


Submitted
29 Mar 2014
Accepted
15 May 2014
First published
20 May 2014

RSC Adv., 2014,4, 23759-23769
Article type
Paper
Author version available

Insight into the pore tuning of triazine-based nitrogen-rich organoalkoxysilane membranes for use in water desalination

S. M. Ibrahim, R. Xu, H. Nagasawa, A. Naka, J. Ohshita, T. Yoshioka, M. Kanezashi and T. Tsuru, RSC Adv., 2014, 4, 23759
DOI: 10.1039/C4RA02772H

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