Liu Yang, Lin Shuo, Liu Yanan, Sarkar Amit Kumar, Bediako John Kwame, Kim Hak Yong, Yun Yeoung-Sang
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
Department of BIN Convergence Technology, Chonbuk National University, Jeonbuk, 54896, Republic of Korea.
Small. 2019 Mar;15(10):e1805242. doi: 10.1002/smll.201805242. Epub 2019 Jan 28.
Precious metals such as palladium (Pd) and platinum (Pt) are marvelous materials in the fields of electronic and catalysis, but they are tapering day by day. Zr(IV)-based metal-organic frameworks (MOFs) are competent for their recovery, notably in harsh environments, while the general powder form limits their practical application. Porous MOF-based membranes with ultraefficient metal ion permeation, strong stability, and high selectivity are, therefore, strikingly preferred. Herein, a set of polymeric fibrous membranes incorporated with the UiO-66 series are fabricated; their adsorption/desorption capabilities toward Pd(II) and Pt(IV) are evaluated from strongly acidic solutions; and the MOF-polymer compatibilities are investigated. Polyurethane (PU)/UiO-66-NH showed strong acid resistance and high chemical stability, which are attributable to strong π-π interactions between PU and MOF nanoparticles with a high configuration of energy. The as-fabricated MOF membranes show extremely good adsorption/desorption performances without ruptures/coalitions of nanofibers or leak of MOF nanoparticles, and successfully display the efficacy in a gravity-driven or even continuous-flow system with good recycle performance and selectivity. The as-fabricated MOF membranes set an example of potential MOF-polymer compatibility for practical applications.
钯（Pd）和铂（Pt）等贵金属是电子和催化领域的优良材料，但它们的储量日益减少。基于锆（IV）的金属有机框架（MOF）能够回收这些贵金属，特别是在恶劣环境中，然而一般的粉末形式限制了它们的实际应用。因此，具有超高效金属离子渗透、强稳定性和高选择性的多孔MOF基膜备受青睐。在此，制备了一组包含UiO-66系列的聚合物纤维膜；从强酸性溶液中评估了它们对Pd（II）和Pt（IV）的吸附/解吸能力；并研究了MOF与聚合物的相容性。聚氨酯（PU）/UiO-66-NH表现出很强的耐酸性和高化学稳定性，这归因于PU与具有高能量构型的MOF纳米颗粒之间的强π-π相互作用。所制备的MOF膜表现出极佳的吸附/解吸性能，纳米纤维没有破裂/团聚，MOF纳米颗粒也没有泄漏，并成功地在重力驱动甚至连续流系统中显示出效果，具有良好的循环性能和选择性。所制备的MOF膜为实际应用中潜在的MOF-聚合物相容性树立了典范。
