Hierarchical structure control of MgAl2O4 porous ceramics and application to organic polymer filtration membrane

Asymmetric porous ceramic membranes typically have a very thin top layer with finer pores covered on thick porous layers with micrometer‐scale pores. In this study, triple‐layer asymmetric MgAl2O4 filtration membranes composed of (i) an Al2O3 support layer (circular pellet with ~10 µm pores) prepare...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2021-12, Vol.104 (12), p.6144-6154
Main Authors: Ma, Zhiyuan, Suzuki, Yoshikazu
Format: Article
Language:English
Subjects:
Aluminum oxide
Asymmetry
Ceramics
Filtration
filtration membrane
Immersion coating
Membranes
MgAl2O4
Microfiltration
Polyethylene oxide
Polymers
porous ceramics
Rejection rate
Sintering (powder metallurgy)
Structural hierarchy
Thickness
Ultrafiltration
Water purification
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Summary:Asymmetric porous ceramic membranes typically have a very thin top layer with finer pores covered on thick porous layers with micrometer‐scale pores. In this study, triple‐layer asymmetric MgAl2O4 filtration membranes composed of (i) an Al2O3 support layer (circular pellet with ~10 µm pores) prepared by dry pressing, (ii) a reactively sintered MgAl2O4 intermediate layer (~40 µm in thickness), prepared by dip‐coating with tackifier (PEG‐20000), and (iii) another reactively sintered finer MgAl2O4 membrane layer (~20 µm in thickness), prepared by dip‐coating without tackifier. Different from our previous studies for the microfiltration of submicrometer‐sized particles, in this study we have challenged the ultrafiltration of water‐soluble polymer molecules. Their filtration performance was investigated by removing 1 million molecular‐weight polyethylene oxide (PEO) from water. The rejection rate of the triple‐layer asymmetric filtration membrane to PEO was ~14%. The all‐ceramic membrane in this study showed a comparable rejection rate with the reported inorganic–organic membrane, and it must be promising for excellent chemical and thermal stabilities as well as long durability.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.18009