期刊
CARBOHYDRATE POLYMERS
卷 189, 期 -, 页码 342-351出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.02.030
关键词
Hybrid membrane; Cellulose acetate membrane; Silica; Sol-gel; Integral asymmetrical membranes; Hydraulic permeability
资金
- FCT [UID/QUI/00100/2013, PTDC/CTM-BIO/6178/2014]
- CeFEMA [UID/CTM/04540/201]
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.
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