Anchoring ZIF-67 particles on amidoximerized polyacrylonitrile fibers for radionuclide sequestration in wastewater and seawater
Anchoring ZIF-67 particles on amidoximerized polyacrylonitrile fibers for radionuclide sequestration in wastewater and seawater
复制标题
将 ZIF-67 颗粒锚定在偕胺肟化聚丙烯腈纤维上，用于废水和海水中的放射性核素封存
DOI：
10.1016/j.jhazmat.2020.122692
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发表时间：
2020-08-05
影响因子：
13.6
通讯作者：
Pang, Huan
中科院分区：
文献类型：
--
作者：
Li, Wenting;Liu, Yang-Yi;Pang, Huan
随着土地资源的日益匮乏，从废水和海水中捕获铀 (U(VI)) 离子对环境和清洁能源极具吸引力。然而，大量的水和超低浓度的U(VI)给工业应用带来了巨大的挑战。因此，我们通过在电纺聚丙烯腈纤维（PAN）上原位生长MOF颗粒，然后用偕胺肟基团进行改性，形成偕胺肟化PAN/ZIF-67（AOPAN/ZIF）杂化纤维，合成了一种新型有机-无机杂化吸附剂。在此类纤维中，咪唑和偕胺肟的N原子可以在较宽的pH范围内协同提高吸附性能，有利于捕获核废水和海水中的U(VI)。结果表明，AOPAN/ZIF纤维在pH值为4的U(VI)污染水溶液中表现出498.4 mg g(-1)的高吸附量。此外，36 d后，在天然海水中U(VI)的吸附量达到2.03 mg g(-1)，这表明AOPAN/ZIF纤维可以促进U(VI)回收的发展。
Capturing uranium (U(VI)) ions from wastewater and seawater is highly attractive for the environment and clean energy with the increasing deficiency of land sources. Howbeit, the massive volume of water and the ultralow concentration of U(VI) pose a substantial challenge to the industrial application. Accordingly, we have synthesized a novel organic-inorganic hybrid adsorbent through in-situ growing MOF particles on electrospun polyacrylonitrile fibers (PAN) followed by modifing with amidoxime groups to form amidoximed PAN/ZIF-67 (AOPAN/ZIF) hybrid fibers. In such fibers, the N atoms from imidazole and amidoxime can improve the adsorption performance synergistically in a wide pH range, which is favorable for capturing U(VI) under nuclear wastewater and seawater. As a result, the AOPAN/ZIF fibers exhibit high adsorption amount of 498.4 mg g(-1) in U(VI) contaminated aqueous solution at pH 4. Furthermore, the adsorption amount of U(VI) reached 2.03 mg g(-1) in natural seawater after 36 d, which implies that the AOPAN/ZIF fibers may promote the development of U(VI) recovery.