It is highly desirable to synthesize high-performance composite hydrogels in a simple and economical manner for uranium extraction from seawater. In this study, tough polyamidoxime-nanocellulose (PAO-CNF) composite hydrogels are fabricated via supramolecular complexation. The nanostructured PAO domains are dispersed in the supramolecularly cross-linked CNF network, guaranteeing superior mechanical strength and satisfied uranium uptake in seawater. A high tensile strength of 4.3 MPa is retained for the composite hydrogels after immersion in seawater for 30 days, which is beneficial for long-term survival in the ocean. The uranium uptake capacity reaches 6.6 mg-U/g in seawater after 35-day adsorption, a synergistic effect from nanostructured PAO domains and hydrophilic CNF network. The tough supramolecular composite hydrogels have great potentials for uranium extraction from seawater, enabling sustainable development of energy and environment.

中文翻译：

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用于从海水中有效提取铀的坚韧聚酰胺肟-纳米纤维素超分子复合水凝胶

非常需要以简单且经济的方式合成高性能复合水凝胶用于从海水中提取铀。在这项研究中，通过超分子络合制备了坚韧的聚酰胺肟-纳米纤维素（PAO-CNF）复合水凝胶。纳米结构的PAO域分散在超分子交联的CNF网络中，保证了优异的机械强度和令人满意的海水中铀吸收。复合水凝胶在海水中浸泡30天后仍保持4.3 MPa的高拉伸强度，有利于在海洋中长期生存。经过35天的吸附，海水中铀的吸收能力达到6.6 mg-U/g，这是纳米结构PAO域和亲水性CNF网络的协同效应。坚韧的超分子复合水凝胶在从海水中提取铀方面具有巨大的潜力，可实现能源和环境的可持续发展。