School of Environment, and Guangdong Key Laboratory of Environmental Pollution and Health , Jinan University , Guangzhou 511443 , P.R. China.
Huizhou Research Institute , Sun Yat-sen University , Huizhou 516081 , P.R. China.
Environ Sci Technol. 2019 Apr 2;53(7):3764-3772. doi: 10.1021/acs.est.9b00408. Epub 2019 Mar 14.
In this work, a versatile postmodification strategy based polydopamine (PDA) grafting is reported for improving CO separation performance of MOF membranes. Owning to the strong bioadhesion, PDA can be deposited on the UiO-66 membrane through a simple and mild process. Since PDA impregnation in invalid nanometer-sized pinholes and grain boundaries of the MOF membrane suppress nonselective gas transports, the modified PDA/UiO-66 membrane exhibits significantly enhanced CO/N and CO/CH selectivities of 51.6 and 28.9, respectively, which are 2-3 times higher than the reported MOF membranes with similar permeance. Meanwhile, because PDA modification do not change UiO-66 intrinsic pores and membrane thickness is submicrometer-sized, the CO permeance is 2-3 orders of magnitude larger than those membranes with similar selectivity, up to 3.7 × 10 mol m s Pa (1115 GPU). Moreover, the PDA/UiO-66 membrane with good reproducibility has excellent long-term stability for CO capture under moist condition in 36 h measurement period.
在这项工作中，报道了一种基于聚多巴胺（PDA）接枝的多功能后修饰策略，用于改善 MOF 膜的 CO 分离性能。由于具有很强的生物粘附性，PDA 可以通过简单温和的过程沉积在 UiO-66 膜上。由于 PDA 浸渍在 MOF 膜的无效纳米级微孔和晶界中抑制了非选择性气体传输，因此改性的 PDA/UiO-66 膜表现出显著增强的 CO/N 和 CO/CH 选择性，分别为 51.6 和 28.9，比具有类似渗透性的报道的 MOF 膜高 2-3 倍。同时，由于 PDA 改性不会改变 UiO-66 的固有孔，且膜厚为亚微米级，CO 的渗透性比选择性相似的膜大 2-3 个数量级，高达 3.7×10-7mol m s Pa（1115 GPU）。此外，在 36 小时测量期间，具有良好重现性的 PDA/UiO-66 膜在潮湿条件下对 CO 具有优异的长期稳定性。
