Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 105, Issue 11, Pages 6554-6569Publisher
WILEY
DOI: 10.1111/jace.18637
Keywords
ceramic membrane; low-cost preparation; pore tuning; ultrathin membrane; vacuum infiltration
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Funding
- National Research Foundation Singapore [NRF-CRP17-2017-01]
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This paper introduces a new ceramic membrane preparation process called melding, which combines vacuum infiltration and pore tuning techniques to construct the ceramic membrane layer directly within the porous ceramic substrate, with high permeance and pollutant removal efficiency.
Conventional ceramic membranes are usually fabricated on porous ceramic substrates, using a repetitive coating-sintering process to form a multilayered structure. This results in lengthy fabrication periods and high fabrication costs. In this work, we developed a novel fabrication process, melding, by combining vacuum infiltration and pore tuning techniques to directly construct the ceramic membrane layer within the porous ceramic substrate. By careful selection of powder sizes, the detrimental penetration effect can be modified into a benefit, forming an ultrathin membrane layer with thickness less than 1.45 mu m after sintering at 1200 degrees C. Compared favorably with dip-coated ceramic membranes, the melded ceramic membrane had much smaller nominal pore sizes (0.19 vs 0.31 mu m), but much higher water permeance (>60%). The melded ceramic membrane also had the highest rejection (98.5%) toward 125 nm polystyrene latex suspensions (2 ppm), highest sustained oil removal efficiency (>90%) under oil-in-water emulsion (200 ppm) filtration, and the least irreversible fouling (<8.6%). The melding process also significantly reduced the raw powders required, leading to an 86% reduction in material costs, as compared to the multilayered ceramic membranes.
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