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Title: Ultrathin TiO2 microfiltration membranes supported on a holey intermediate layer to raise filtration performance
Authors: Zhang Z. 
Ng T.C.A. 
Gu Q. 
Zhang L. 
Lyu Z. 
Zhang X.
Ng H.Y. 
Wang J. 
Keywords: High water permeability
Holey intermediate layer
TiO2 microfiltration membrane
Ultrathin thickness
Issue Date: 23-Sep-2020
Publisher: Elsevier Ltd
Citation: Zhang Z., Ng T.C.A., Gu Q., Zhang L., Lyu Z., Zhang X., Ng H.Y., Wang J. (2020-09-23). Ultrathin TiO2 microfiltration membranes supported on a holey intermediate layer to raise filtration performance. Journal of the European Ceramic Society. ScholarBank@NUS Repository.
Abstract: Ultrathin TiO2 microfiltration membranes with thicknesses in the range of 1−7 μm were prepared by coating TiO2 suspensions on purposely designed holey Al2O3 substrates. The effects of the TiO2 top layer thickness on surface roughness, pore size distribution, and thereby on water flux, steady permeate and retention performance of the overall membrane were systematically investigated. The ultrathin TiO2 membrane layer with a thickness of ∼3 μm, surface roughness of ∼109 nm and an average pore size of 87 nm shows the best overall performance. Its pure water flux (2214 Lm−2 h-1 bar-1) at 100 kPa and normalized permeate flux (59 %) after 50-min filtration in a feed solution of 70-nm polystyrene nanospheres (2 ppm) are much higher than those of the control TiO2 membrane (696 Lm−2 h-1 bar-1 and 27 %). The disruptively improved pure water flux and normalized steady permeate flux, without significantly sacrificing the retention performance, are correlated to the unique membrane structural features. © 2020 Elsevier Ltd
Source Title: Journal of the European Ceramic Society
ISSN: 09552219
DOI: 10.1016/j.jeurceramsoc.2020.09.053
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