Breathable Janus Mineral Fabrics Integrate High Flux and Antifouling Performance

ABSTRACT The demand for highly reactive textiles with high water flux is increasing. Large‐pore fabrics inherently face two performance limitations: hydrophilic surfaces are vulnerable to oil intrusion, and rapid water flow shortens hydraulic residence time to suppress pollutant degradation. To enable both high flux and dual‐mode antifouling performance, we developed an interfacial reaction strategy that integrates a well‐assembled iron oxide‐polydopamine composite heterojunction onto a mineral fabric. By tailoring the fabric's normal‐direction Janus wettability, the highly active side exhibits superhydrophilicity while establishing a breakthrough pressure difference of up to 1342 Pa. This design effectively isolates oil‐fouling and achieves unidirectional water transport, confining the aqueous phase within the catalytic layer to create a restricted reaction environment for prolonged contact. Leveraging the synergistic activity of photothermal‐assisted photocatalysis and Fenton‐like reactions, the Janus fabric achieves a degradation kinetic constant k of 0.109 min −1 for aqueous organic pollutants, over tenfold higher than that under dark conditions, fundamentally avoiding activity decay caused by adsorption accumulation and ultimately endowing the Janus fabric with durable dual‐mode antifouling performance. This strategy offers valuable insights for designing advanced composite fabrics with potential application in environment protection, bioengineering, and energy.