Tuo Kai, Li Jin, Li Yi, Liang Chuyao, Shao Cuicui, Hou Weifeng, Li Zhijian, Pu Shouzhi, Deng Chunhui
Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, PR China.
YuZhang Normal University, Nanchang 330013, PR China.
Mater Horiz. 2024 Jul 15;11(14):3364-3374. doi: 10.1039/d3mh02108d.
Efficient uranium extraction from seawater is critical for the development of the nuclear industry. Herein, a polydopamine/salicylaldoxime decorated hierarchical zeolitic imidazolate framework-8 (H-PDA/SA-ZIF-8) is constructed by using a controlled etching process. Benefiting from the combination of PDA/SA and the zeolitic imidazolate framework-8 (ZIF-8), as well as a controlled etching process, the H-PDA/SA-ZIF-8 possesses multiaffinity sites, excellent specific surface area (1234.92 m g), and a hierarchical pore structure. The H-PDA/SA-ZIF-8 exhibits excellent adsorption capacity ( = 869.6 mg g), selectivity, and reusability in uranium adsorption. The adsorption process of H-PDA/SA-ZIF-8 fits very well with the Langmuir isotherm model and pseudo-second-order models, and the adsorption process equilibrates within 20 min ( = 20 mg L). Furthermore, the H-PDA/SA-ZIF-8 shows remarkable antibacterial ability. Impressively, the adsorption capacity of H-PDA/SA-ZIF-8 to uranium in natural seawater reaches 6.9 mg g after circulation for 15 days. Therefore, the H-PDA/SA-ZIF-8 is a promising and fascinating material for uranium extraction from natural seawater.
从海水中高效提取铀对核工业的发展至关重要。在此，通过可控蚀刻工艺构建了一种聚多巴胺/水杨醛肟修饰的分级沸石咪唑酯骨架-8（H-PDA/SA-ZIF-8）。得益于PDA/SA与沸石咪唑酯骨架-8（ZIF-8）的结合以及可控蚀刻工艺，H-PDA/SA-ZIF-8具有多个亲和位点、优异的比表面积（1234.92 m²/g）和分级孔结构。H-PDA/SA-ZIF-8在铀吸附方面表现出优异的吸附容量（869.6 mg/g）、选择性和可重复使用性。H-PDA/SA-ZIF-8的吸附过程与朗缪尔等温线模型和准二级模型拟合得非常好，且在20分钟内（铀浓度为20 mg/L）吸附过程达到平衡。此外，H-PDA/SA-ZIF-8还表现出显著的抗菌能力。令人印象深刻的是，经过15天的循环后，H-PDA/SA-ZIF-8对天然海水中铀的吸附容量达到6.9 mg/g。因此，H-PDA/SA-ZIF-8是一种从天然海水中提取铀的有前景且引人关注的材料。
