Abstract
High-porosity dendritic porous alumina was fabricated by using tertiary butanol (TBA) hydrate crystals combined with directional freeze casting. The porosity of this porous alumina approximated 80 %, and its high porosity resulted in high water flux. Dendritic pores improved the physical interception capability of porous ceramics due to the intrinsic moving paths and intercepts from the pore structure. Changes in the TBA content (from 70 vol.% to 85 vol.%) caused a change in pore size from 36.58 μm to 11.54 μm and pore structure (change order: snowflake, dendritic, rod-like, and needle-like), which are important factors affecting water flux and interception capability. The interception and removal of Escherichia coli by 7 mm-height porous ceramics with dendritic structure and an average pore size of 27.90 μm reached 100 % at pH 7.2. This study provides a simple and low-cost method for the effective removal of bacteria.
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