Journal
CERAMICS INTERNATIONAL
Volume 49, Issue 4, Pages 6834-6842Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.10.233
Keywords
Pressing; Membrane support; Geopolymer; Metakaolin
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This study investigates the use of one-part pressed geopolymers as a support for microfiltration membranes. The properties of these materials, including mineralogy, physical characteristics, microstructure, and hydraulic properties, are presented. The geopolymeric membrane flat supports were synthesized through pressing a dry-mixed powder and optimizing the mixing and pressing process. The results show that the geopolymers have high open porosity, pore diameter, and flexural strength, demonstrating their potential as microfiltration support.
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 investi-gated 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 ??m 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.
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