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Title: Highly permeable Al2O3 microfiltration membranes with holey interior structure achieved through sacrificial C particles
Authors: Zhang Z. 
Ng T.C.A. 
Gu Q. 
Zhang L. 
He Z. 
Lyu Z. 
Zhang X.
Wang W.
Ng H.Y. 
Wang J. 
Issue Date: 31-Dec-2019
Publisher: Blackwell Publishing Inc.
Citation: Zhang Z., Ng T.C.A., Gu Q., Zhang L., He Z., Lyu Z., Zhang X., Wang W., Ng H.Y., Wang J. (2019-12-31). Highly permeable Al2O3 microfiltration membranes with holey interior structure achieved through sacrificial C particles. Journal of the American Ceramic Society 103 (5) : 3361-3372. ScholarBank@NUS Repository.
Abstract: Alumina (Al2O3) microfiltration membranes with holey interior structure exhibit the combined desirable properties of both superior permeability and good retention performance. These membranes are purposely made to consist of a holey intermediate layer with a thickness in the range 12.9-15.5 μm and a top filtration layer of very thin thickness in the range 1.8-2.8 μm, fabricated by cosintering with sacrificial carbon (C) particles. The holey structure in the intermediate layer, which can be well controlled by regulating the amount of C particles added to Al2O3 particles, contains plenty of holes of 1-5 μm in size, thereby possessing much reduced water flow resistance. The thin top filtration layer, which contains uniformly distributed nanopores of 90-100 nm in size, functions as the selective layer, thereby ensuring a good retention performance. At the C particle content of 30 wt. %, the Al2O3 membrane with holey interior structure demonstrates a super-high pure water flux (3358 Lm-2h-1), which is almost twice that of the membrane without holey interior structure (1697 Lm-2h-1), while the mechanical strength and retention performance are well maintained. © 2020 The American Ceramic Society
Source Title: Journal of the American Ceramic Society
ISSN: 00027820
DOI: 10.1111/jace.16987
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