Publication Type Journal Article
Title Structure of water in hybrid cellulose acetate-silica ultrafiltration membranes and permeation properties
Authors Goncalo Mendes Monica Faria Alexandra Carvalho M. Clara Gonçalves Maria Norberta de Pinho
Groups MPPM
Journal CARBOHYDRATE POLYMERS
Year 2018
Month June
Volume 189
Number
Pages 342-351
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 C-OH or acetate groups from the CA polymer. For all the CA/SiO2 membranes, the ATR-FTIR peak assigned to (Si-O-C) proves the hybrid condensation reaction and confirms the synthesis of monophasic hybrid membranes. ATR-FTIR shows the presence of uncondensed highly reactive Si-OH species, in membranes with silica contents higher than 20 mol\%. Together with RMN studies, results show molecular water strongly hydrogen-bonded with Si-OH groups, yielding a drastic decrease in the membrane hydraulic permeability, from 57 to 10 kg/h/m(2)/bar. The incorporation of 5 and 10 mol\% of silica increased the hydraulic permeability from 32 to 82 kg/h/m(2)/bar when compared to the CA membrane.
DOI http://dx.doi.org/10.1016/j.carbpol.2018.02.030
ISBN
Publisher
Book Title
ISSN 0144-8617
EISSN 1879-1344
Conference Name
Bibtex ID ISI:000428322000042
Observations
Back to Publications List