State Key Laboratory of Radiation Medicine and Protection, School of Radiological and Interdisciplinary Sciences (RAD-X), Soochow University, Suzhou 215123, China.
State Key Laboratory of Radiation Medicine and Protection, School of Radiological and Interdisciplinary Sciences (RAD-X), Soochow University, Suzhou 215123, China; Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Suzhou 215123, China.
J Hazard Mater. 2019 Apr 15;368:214-220. doi: 10.1016/j.jhazmat.2019.01.048. Epub 2019 Jan 16.
Porous aromatic frameworks with structural/pore controllability and rigid skeletons present a series of emerging materials for solid phase extraction. However, the complicated monomers or noble metal catalyst, and cumbersome synthetic strategies result in high-cost engineering application of porous aromatic frameworks. Herein, a simple synthetic strategy of porous aromatic frameworks with phosphonate is reported for efficient separation of uranium from radioactive effluents, and petroleum pitch, a low-cost and widely available material, was used as the building block. 4-Vinylbenzylphosphonic acid diethyl ester monomer is introduced to chelate uranium and to improve the aqueous dispersibility of sorbents. The phosphonate functionalized PPAFs take 40 min to achieve adsorption equilibrium, and the maximum sorption capacity reaches 147 mg U/g at pH 1.0. PPAFs exhibit good selectivity over various competing ions and excellent radioresistance in acidic solution. Besides, PPAFs remain almost 100% sorption efficiency and intact structure over 5 sorption-desorption cycles with alkaline eluent. This work not only applies a low-cost material for uranium extraction, but a new idea for the utilization of waste and recycling of resources.
具有结构/孔可控性和刚性骨架的多孔芳香骨架为固相萃取提供了一系列新兴材料。然而，复杂的单体或贵金属催化剂以及繁琐的合成策略导致多孔芳香骨架的高成本工程应用。本文报道了一种简单的合成方法，使用廉价且广泛存在的石油沥青作为构筑块，通过膦酸酯合成多孔芳香骨架，用于从放射性废水中高效分离铀。4-乙烯基苄基膦酸二乙酯单体被引入以螯合铀并提高吸附剂的水分散性。磷功能化的 PPAFs 在 40 分钟内达到吸附平衡，在 pH 值为 1.0 时，最大吸附容量达到 147mgU/g。PPAFs 在酸性溶液中对各种竞争离子表现出良好的选择性和优异的耐辐射性。此外，用碱性洗脱剂进行 5 次吸附-解吸循环后，PPAFs 的吸附效率仍保持在近 100%，且结构完整。这项工作不仅为铀的提取应用了一种低成本的材料，还为废物利用和资源回收提供了新的思路。
