Yao Bing-Jian, Jiang Wei-Ling, Dong Ying, Liu Zhi-Xian, Dong Yu-Bin
College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Centre of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University, Jinan, 250014, P. R. China.
Chemistry. 2016 Jul 18;22(30):10565-71. doi: 10.1002/chem.201600817. Epub 2016 Jun 15.
Metal-organic frameworks (MOFs) are widely used as porous materials in the fields of adsorption and separation. However, their practical application is largely hindered by limitations to their processability. Herein, new UiO-66-Urea-based flexible membranes with MOF loadings of 50 (1), 60 (2), and 70 wt % (3) were designed and prepared by post-synthetic polymerization of UiO-66-NH2 nanoparticles and a polyurethane oligomer under mild conditions. The adsorption behavior of membrane 3 towards four hydrophilic dyes, namely, eosin Y (EY), rhodamine B (RB), malachite green (MG), and methylene blue (MB), in aqueous solution was studied in detail. It exhibits strong adsorption of EY and RB but weak adsorption of MG and MB in aqueous solution. Owing to the selective adsorption of these hydrophilic dyes, membrane 3 can remove EY and RB from aqueous solution and completely separate EY/MB, RB/MG, and RB/MB mixtures in aqueous solution. In addition, the membrane is uniformly textured, easily handled, and can be reused for dye adsorption and separation.
金属有机框架材料（MOFs）作为多孔材料在吸附和分离领域被广泛应用。然而，其可加工性的限制在很大程度上阻碍了它们的实际应用。在此，通过在温和条件下将UiO-66-NH₂纳米颗粒与聚氨酯低聚物进行后合成聚合，设计并制备了MOF负载量分别为50（1）、60（2）和70 wt%（3）的新型基于UiO-66-尿素的柔性膜。详细研究了膜3对水溶液中四种亲水性染料，即曙红Y（EY）、罗丹明B（RB）、孔雀石绿（MG）和亚甲基蓝（MB）的吸附行为。它在水溶液中对EY和RB表现出强吸附，而对MG和MB表现出弱吸附。由于对这些亲水性染料的选择性吸附，膜3可以从水溶液中去除EY和RB，并能完全分离水溶液中的EY/MB、RB/MG和RB/MB混合物。此外，该膜质地均匀，易于处理，可重复用于染料吸附和分离。
