Biomimetic Nanofibrous Aerogels Enabling High‐Temperature PM Filtration and Photocatalytic CO 2 Conversion for Sustainable Industrial Filtration Systems

ABSTRACT Industrial particulate matter (PM) and carbon dioxide (CO 2 ) emissions pose severe environmental health risks, yet developing high‐temperature‐resistant filters with concurrent PM capture and CO 2 conversion capabilities remains a critical challenge, driving demand for advanced multifunctional filtration materials. Here, a cactus‐inspired multigradient multifunctional Indium oxide @ Bismuth Sulfobromide/oxidized polyaryl sulfide sulfone (In 2 O 3 @Bi 19 Br 3 S 27 /OPASS (MMIB/OP)) nanofibrous aerogel that synergistically integrates PM filtration and CO 2 photocatalytic degradation will be presented. This aerogel was prepared by combining grooved‐structured high‐performance OPASS resin nanofibres with flower‐like and spiny inorganic microstructures. The system achieves excellent PM 0.3 filtration efficiency (99.72%) at ultra‐low pressure drop (71.48 Pa) under ambient conditions, while maintaining stable filtration performance at 300°C (96.66%). In addition, the filter was also able to exhibit excellent photocatalytic activity with a CO yield of 46.8 µmol·h −1 g −1 . Theoretical modelling and experimental results show that the air purification and photocatalysis of the MMIB/OP filter can be attributed to the uniform distribution of the S‐type heterojunction catalysts on the surface of the groove‐structured fibres. It provides a new strategy for developing highly efficient and durable multifunctional air filters, which is expected to promote the upgrading of industrial filtration systems toward green and low‐carbon.