Enhancing hydrophilicity and permeation flux of chitosan/kaolin composite membranes by using polyethylene glycol as porogen

A novel chitosan/kaolin composite membrane with high flux and enhanced hydrophilicity was prepared by solvent casting and evaporation process in the presence of polyethylene glycol (PEG). The characterization of the as-fabricated membranes indicated that the combined effect of kaolin as reinforcing...

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Veröffentlicht in:Applied clay science 2019-02, Vol.168, p.312-323
Hauptverfasser: Rekik, Sonia Bouzid, Gassara, Sana, Bouaziz, Jamel, Deratani, André, Baklouti, Semia
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Sprache:eng
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Zusammenfassung:A novel chitosan/kaolin composite membrane with high flux and enhanced hydrophilicity was prepared by solvent casting and evaporation process in the presence of polyethylene glycol (PEG). The characterization of the as-fabricated membranes indicated that the combined effect of kaolin as reinforcing agent and PEG as porogen into a chitosan matrix showed significant influence on the morphology and hydrophilicity. Highly porous membranes with finger-like structure were obtained. Both size and density of the pores increased with increasing the PEG content from 0 to 3 wt%. The incorporation of the hydrophilic polymeric additive constructed a water channel network and increased the free volume within the composite matrix, contributing to the enhanced filtration performance of the resulting membrane. Additionally, their mechanical, thermal and chemical stability showed a large improvement compared to the unmodified one. [Display omitted] •Chitosan/kaolin/PEG composite membranes were successfully prepared.•Thermal, chemical and mechanical properties are improved in composites.•A highly porous morphology was obtained.•Composites show better hydrophilicity and water flux than the pristine membranes.
ISSN:0169-1317
1872-9053
DOI:10.1016/j.clay.2018.11.029