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1453025 
Journal Article 
Cation exchange PVA/SPPO/SiO2 membranes with double organic phases for alkali recovery 
Wu, Y; Hao, J; Wu, C; Mao, F; Xu, T 
2012 
Yes 
Journal of Membrane Science
ISSN: 0376-7388 
423 
383-391 
WOS:000311480800041 
Cation exchange hybrid membranes are prepared from
sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) (SPPO), polyvinyl alcohol (PVA) and
tetraethoxysilane (TEOS). The membranes contain double organic phases of PVA and SPPO, and thus
can combine their advantages of organic solvent resistance and ion exchange property. The SPPO
phase is encapsuled in PVA/SiO2 matrix, and thus the crosslinking degree of PVA/SiO2 matrix
decreases. The hybrid membranes have the ion exchange capacities (IECs) of 0.44-1.34 mmol/g, and
are stable in ethanol. The ethanol uptake (E-R) is in the range of 1.3-21.3%, and the swelling
degree in 65 degrees C ethanol is in the range of 7.5-54.5%. The membranes have the tensile
strength (TS) of 30-70 MPa, with the elongation at break (E-b) of 5-13%. The initial
decomposition temperatures are all higher than 220 degrees C. Diffusion dialysis (DD) test
indicates that, the membranes can be potentially applied for alkali recovery. The dialysis
coefficient of NaOH (U-OH) is in the range of 0.007-0.013 m/h, and the highest separation factor
(S) can reach up to 181. The DD performance may be influenced by three aspects, including
membrane hydrophilicity, IEC and the interstices between PVA and SPPO phases. Methods of aldehyde
crosslinking and ethanol swelling are compared to enhance membrane stability, and the ethanol
swelling is more beneficial to DD process. (c) 2012 Elsevier B.V. All rights reserved. 
Cation exchange membrane; SPPO; PVA; Diffusion dialysis; Alkali recovery 
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