This study reports on the possibility of applying one-part pressed geopolymers as a support for microfiltration membranes. The mineralogical, physical, mechanical, microstructural and hydraulic properties of the investigated materials are presented. Metakaolin-based geopolymeric membrane flat supports were synthesized by uniaxial pressing a dry-mixed powder (Si/Al = 1.45, Na/Al = 0.9, Na/Si = 0.62, H2O = 12%), with pressure between 2 and 20 MPa and a curing temperature of 70 °C. Mixing and pressing optimization resulted in samples with a total open porosity up to 39%, a modal pore diameter up to 23.5 μm and a flexural strength up to 20.4 MPa. Permeation measurement with demineralized water and ethanol-water solutions were carried out using a dead-end geometry membrane apparatus. A hydraulic permeability up to 31.3·103 L h−1 m−2 bar−1 has been obtained. Furthermore, permeation tests using water-ethanol solutions have demonstrated that the material is hydrophilic. These results highlighted the potential of geopolymers as microfiltration support.

Preparation and characterization of metakaolin-based geopolymer membrane supports by facile pressed one-part route / Filipponi A.; Masi G.; Bandini S.; Bignozzi M.C.. - In: CERAMICS INTERNATIONAL. - ISSN 0272-8842. - ELETTRONICO. - 49:4(2023), pp. 6834-6842. [10.1016/j.ceramint.2022.10.233]

Preparation and characterization of metakaolin-based geopolymer membrane supports by facile pressed one-part route

Masi G.
Secondo
;
Bandini S.
Penultimo
;
Bignozzi M. C.
Ultimo
2023

Abstract

This study reports on the possibility of applying one-part pressed geopolymers as a support for microfiltration membranes. The mineralogical, physical, mechanical, microstructural and hydraulic properties of the investigated materials are presented. Metakaolin-based geopolymeric membrane flat supports were synthesized by uniaxial pressing a dry-mixed powder (Si/Al = 1.45, Na/Al = 0.9, Na/Si = 0.62, H2O = 12%), with pressure between 2 and 20 MPa and a curing temperature of 70 °C. Mixing and pressing optimization resulted in samples with a total open porosity up to 39%, a modal pore diameter up to 23.5 μm and a flexural strength up to 20.4 MPa. Permeation measurement with demineralized water and ethanol-water solutions were carried out using a dead-end geometry membrane apparatus. A hydraulic permeability up to 31.3·103 L h−1 m−2 bar−1 has been obtained. Furthermore, permeation tests using water-ethanol solutions have demonstrated that the material is hydrophilic. These results highlighted the potential of geopolymers as microfiltration support.
2023
Preparation and characterization of metakaolin-based geopolymer membrane supports by facile pressed one-part route / Filipponi A.; Masi G.; Bandini S.; Bignozzi M.C.. - In: CERAMICS INTERNATIONAL. - ISSN 0272-8842. - ELETTRONICO. - 49:4(2023), pp. 6834-6842. [10.1016/j.ceramint.2022.10.233]
Filipponi A.; Masi G.; Bandini S.; Bignozzi M.C.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/916794
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