Engineering Dual‐Functional Polypyrrole‐Grafted Amidoxime‐Based Nanofibrous Adsorbent for an Integrated Solar‐Powered Water‐Uranium‐Food Nexus System

ABSTRACT Integrated marine resource utilization is vital for sustainable water, energy, and food supply. Herein, a solar‐powered system integrating dual‐functional fibrous mats (Ppy‐PAO NFs) with a spherical evaporation–condensation‐irrigation device (SECID) was developed for simultaneous uranium (U) extraction, freshwater production, and crop irrigation. The Ppy‐PAO NFs, prepared via vapor‐phase graft polymerization (VGP), exhibit enhanced U affinity and photothermal performance, achieving adsorption capacities of 15.13 mg/g (dark) and 16.37 mg/g (light) in simulated seawater, compared with pristine AO‐nanofibers representing increases of 11.41% and 20.54%, respectively, along with a pure water evaporation rate of 1.74 kg/(m 2 ·h). Within the integrated platform, freshwater yield reached 3.85 kg/(m 2 ·d), and Na, Mg, Ca, and U concentrations in the condensate decreased by 3–4 orders of magnitude, meeting WHO drinking water standards. The collected freshwater was automatically supplied to a cultivation unit, supporting the growth of various crops and enabling integrated water–uranium–food production. Performance projections indicate that a 12 100 m 2 marine platform could monthly extract 3.85 kg of U, produce 805.50 tons of freshwater, and yield 2.10 tons of vegetables, meeting the daily needs of 100 offshore personnel. This work offers a sustainable pathway for integrated marine water–uranium–food resource utilization.