Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering , Nanjing University of Science and Technology , Nanjing 210094 , People's Republic of China.
ACS Appl Mater Interfaces. 2018 Jul 18;10(28):24164-24171. doi: 10.1021/acsami.8b07826. Epub 2018 Jul 5.
Global environmental challenges especially nuclear pollution pose a great threat to human health and public safety. Metal-organic frameworks (MOFs) with high surface area and excellent stability are potential candidates for the remediation of nuclear pollution. Herein, a ZIF-8-based polyacrylonitrile (PAN) fibrous filter was prepared by an in situ hydrothermal treatment of fibrous filters consisting of PAN, poly(vinylpyrrolidone) (PVP), and zinc ions with an electrospinning method. In the process of hydrothermal treatment, PVP can be extracted from the PAN nanofibers and result in porous structures. Benefiting from these porous structures, the in situ ZIF-8/PAN filters demonstrated a high adsorption capacity of U(VI) (530.3 mg g at pH = 3.0). The extended X-ray absorption fine structure revealed that the adsorption mechanism demonstrated surface complexation between U(VI) and 2-methylimidazole. Furthermore, the adsorption device was fabricated, and the dynamic adsorption shows that in situ ZIF-8/PAN is a promising material for treating the nuclear wastewater. The present work may provide a new strategy to fabricate MOFs into functional devices to remediate the increasing global environmental concerns.
全球环境挑战，尤其是核污染，对人类健康和公共安全构成了巨大威胁。具有高表面积和优异稳定性的金属-有机骨架（MOFs）是修复核污染的潜在候选材料。在此，通过静电纺丝法，以 PAN、聚（N-乙烯基吡咯烷酮）（PVP）和锌离子为原料，制备了一种基于 ZIF-8 的 PAN 纤维状过滤器。在水热处理过程中，PVP 可以从 PAN 纳米纤维中提取出来，形成多孔结构。受益于这些多孔结构，原位 ZIF-8/PAN 过滤器对 U(VI)（在 pH = 3.0 时为 530.3 mg g）表现出高吸附能力。扩展 X 射线吸收精细结构表明，吸附机制表现为 U(VI)与 2-甲基咪唑之间的表面络合。此外，还构建了吸附装置，动态吸附表明原位 ZIF-8/PAN 是处理核废水的一种很有前途的材料。本工作可能为将 MOFs 制备成功能器件以修复日益严重的全球环境问题提供了一种新策略。
