High-Performance γ-Al2O3 Multichannel Tube-Type Tight Ultrafiltration Membrane Using a Modified Sol-Gel Method

We introduced a modified sol-gel method using polyvinyl alcohol (PVA) as an additive to improve the permeability of γ-Al2O3 membranes by minimizing the thickness of the selective layer and maximizing the porosity. First, the analysis revealed that the thickness of γ-Al2O3 decreased as the concentrat...

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Bibliographic Details
Published in:Membranes (Basel) 2023-04, Vol.13 (4), p.405
Main Authors: Naseer, Danyal, Ha, Jang-Hoon, Lee, Jongman, Lee, Hong Joo, Song, In-Hyuck
Format: Article
Language:English
Subjects:
Additives
Aluminum oxide
Boehmite
high permeability
Mathematical models
Membrane permeability
Membranes
mesoporous
Morphology
multichannel
Permeability
Polyethylene glycol
Polyvinyl alcohol
Pore size
Porosity
Resource recovery
Route selection
sol-gel method
Sol-gel processes
Thickness
Tortuosity
Transitional aluminas
Ultrafiltration
Viscosity
γ-Al2O3 membranes
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Summary:We introduced a modified sol-gel method using polyvinyl alcohol (PVA) as an additive to improve the permeability of γ-Al2O3 membranes by minimizing the thickness of the selective layer and maximizing the porosity. First, the analysis revealed that the thickness of γ-Al2O3 decreased as the concentration of PVA increased in the boehmite sol. Second, the properties of the γ-Al2O3 mesoporous membranes were greatly influenced by the modified route (method B) compared to the conventional route (method A). The results showed that the porosity and surface area of the γ-Al2O3 membrane increased, and the tortuosity decreased considerably using method B. This effect was attributed to the adsorption of PVA molecules on the surface of the boehmite particles, which depended on the synthesis route. The experimentally determined pure water permeability trend and the Hagen–Poiseuille mathematical model confirmed that the modified method improved the performance of the γ-Al2O3 membrane. Finally, the γ-Al2O3 membrane fabricated via a modified sol-gel method with a pore size of 2.7 nm (MWCO = 5300 Da) exhibited a pure water permeability of over 18 LMH/bar, which is three times higher than that of the γ-Al2O3 membrane prepared using the conventional method.
ISSN:2077-0375
2077-0375
DOI:10.3390/membranes13040405