Ultrafast and Efficient Extraction of Uranium from Seawater Using an Amidoxime Appended Metal-Organic Framework
Ultrafast and Efficient Extraction of Uranium from Seawater Using an Amidoxime Appended Metal-Organic Framework
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DOI：
10.1021/acsami.7b12396
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发表时间：
2017-09-27
影响因子：
9.5
通讯作者：
Wang, Shuao
中科院分区：
文献类型：
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作者：
Chen, Long;Bai, Zhuanling;Wang, Shuao
从海水中富集铀酰对核能的可持续发展至关重要，但目前的铀萃取技术存在吸附效率低、吸收动力学慢、萃取选择性差等多重缺陷。本文采用合成后修饰法制备了首个偕胺肟附加金属有机骨架UiO-66-AO，用于海水中铀的快速高效提取。UiO-66-AO在120 min内可去除渤海海水中94.8%的铀酰离子，在10 min内可去除含有500 ppb铀的渤海海水中99%的铀酰离子。实际海水样品对铀酰的吸附量为2.68 mg/g。此外，UiO-66-AO框架在至少三个吸附/解吸循环中具有可回收性。通过对铀吸附样品的扩展x射线吸收精细结构（EXAFS）分析进一步探讨了优越吸附能力的来源，表明多个偕胺肟配体能够螯合铀酰（VI）离子，形成六方双棱锥配位几何结构。
Enrichment of uranyl from seawater is crucial for the sustainable development of nuclear energy, but current uranium extraction technology suffers from multiple drawbacks of low sorption efficiency, slow uptake kinetics, or poor extraction selectivity. Herein, we prepared the first example of amidoxime appended metal organic framework UiO-66-AO by a postsynthetic modification method for rapid and efficient extraction of uranium from seawater. UiO-66-AO can remove 94.8% of uranyl ion from Bohai seawater within 120 min and 99% of uranyl ion from Bohai seawater containing extra 500 ppb uranium within 10 min. The uranyl sorption capacity in a real seawater sample was determined to be 2.68 mg/g. In addition, the recyclability of the UiO-66-AO framework was demonstrated for at least three adsorption/desorption cycles. The origin for the superior sorption capability was further probed by extended X-ray absorption fine structure (EXAFS) analysis on the uranium-sorbed sample, suggesting multiple amidoxime ligands are able to chelate uranyl(VI) ions, forming a hexagonal bipyramid coordination geometry.