Abstract
AbstractThe rapid development of engineering filtering process suggests that it is imperative to produce membrane substrates with a fine pore size, high gas permeation, and antifouling properties for efficient and long‐term application. This study reports on a novel fabrication method of a porous Al2O3/CaAl12O19 ceramic membrane substrate by a direct foaming method combined with cement solidification and tape‐casting technology. The microstructure of the produced ceramic membrane consisted of pores with a size of 50‐150 μm, which were interconnected with each other with a large number of small filtering functional pores of <10 μm. By increasing the amount of the foaming agent, the porosity of the porous Al2O3/CaAl12O19 ceramic membranes was tailored from 64.8% to 80.5%, and the bending strength decreased from 32.1 ± 1.0 to 9.6 ± 0.9 MPa, respectively. The sintered hydrophilic ceramic substrate was successfully modified to a hydrophobic one (with water contact angles of 143°) by pyrolysis of dimethyldichlorosilane and dichloromethylsilane. The resultant membrane displayed high chemical stability and self‐cleaning features. The membrane with a porosity of 64.8% had a N2 permeation of 3.0 (±0.5) × 107 L m−2 h−1 at 0.5 bar and a water flux which could be totally suppressed at a liquid entry pressure of 0.45 bar.
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