Structure of water in hybrid cellulose acetate-silica ultrafiltration membranes and permeation properties.
Carbohydr Polym
; 189: 342-351, 2018 Jun 01.
Article
em En
| MEDLINE
| ID: mdl-29580418
ABSTRACT
Hybrid cellulose acetate (CA) silica (SiO2) (CA/SiO2) membranes were synthesized by promoting the in situ condensation between silanols from the SiO2 precursor and the COH or acetate groups from the CA polymer. For all the CA/SiO2 membranes, the ATR-FTIR peak assigned to (SiOC) proves the hybrid condensation reaction and confirms the synthesis of monophasic hybrid membranes. ATR-FTIR shows the presence of uncondensed highly reactive SiOH species, in membranes with silica contents higher than 20â¯mol%. Together with RMN studies, results show molecular water strongly hydrogen-bonded with SiOH groups, yielding a drastic decrease in the membrane hydraulic permeability, from 57 to 10â¯kg/h/m2/bar. The incorporation of 5 and 10â¯mol% of silica increased the hydraulic permeability from 32 to 82â¯kg/h/m2/bar when compared to the CA membrane.
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MEDLINE
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En
Ano de publicação:
2018
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Article