A Foldable All-Ceramic Air Filter Paper with High Efficiency and High-Temperature Resistance

Advanced filter materials
with high efficiency, low-pressure drop,
and high-temperature resistance are urgently needed in the field of
high-temperature gas filtration. Here, an Al2O3-stabilized ZrO2 (ASZ) submicron fiber air filter paper
with excellent flexibility and thermal stability (up to 1100 °C)
is developed using a cost-effective, scalable solution blow spinning
method and subsequent calcination. The ASZ papers demonstrate excellent
flexibility and foldability, which can be attributed to the tetragonal
phase and small crystallite size of the ASZ fibers due to the presence
of Al2O3. In addition, the ASZ papers with an
areal density of 56 mg cm–2 show a high filtration
efficiency (99.56%) and a low-pressure drop (108 Pa) for 15–615
nm NaCl particles at an airflow velocity of 5.4 cm s–1. We envision that the foldable all-ceramic air filter material will
provide a solution for the removal of particulate matter from the
high-temperature exhaust gases.