Abstract
Uranium (U) extraction from seawater by novel porous materials, such as covalent organic frameworks (COFs), holds great promise for developing nuclear energy. Currently, most COFs deplored for U extraction from seawater are devoid of macro-continuity, thus hindering their practical application. Here, we report a facile method of constructing photosensitive COFs into a superelastic aerogel structure based on size rearrangement and multi-interfacial interaction engineering with bacterial cellulose nanofibers (BCNs). The resultant photosensitive COF aerogels (PCAs) exhibit a record-high AZO-3 loading (∼90 %), hierarchical porosity, high surface area (188.27 m2/g), and superior underwater stability and elasticity over 500 compressions. Eventually, the PCAs show excellent photoinduced U extraction performances with 838.70 % improved U extraction capacity than in a dark condition, good recyclability, and superior adsorption selectivity (selectivity coefficient up to 26.99). The successful design of PCAs offered attractive perspectives on the development of next-generation adsorbents for U extraction from seawater. This work is also expected to inspire the design of other typical porous adsorbents into a macro-continuous matrix with improved mass transfer properties and stability.
Published Version
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