Polydopamine-Modified Metal-Organic Framework Membrane with Enhanced Selectivity for Carbon Capture
Polydopamine-Modified Metal-Organic Framework Membrane with Enhanced Selectivity for Carbon Capture
复制标题
具有增强碳捕获选择性的聚多巴胺改性金属有机骨架膜
DOI：
10.1021/acs.est.9b00408
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发表时间：
2019
影响因子：
11.4
通讯作者：
Li Wanbin
中科院分区：
文献类型：
--
作者：
Wu Wufeng;Li Zhanjun;Chen Yu;Li Wanbin
在这项工作中，一个通用的后改性策略为基础的聚多巴胺（PDA）接枝报道，以提高CO2分离性能的MOF膜。由于PDA具有很强的生物粘附性，因此可以通过简单温和的过程将PDA沉积在UiO-66膜上。由于PDA浸渍在无效的纳米尺寸的针孔和晶界的MOF膜抑制非选择性气体传输，改性的PDA/UiO-66膜表现出显着提高CO2/N2和CO2/CH 4的选择性分别为51.6和28.9，这是2-3倍高，具有类似的渗透性的MOF膜。同时，由于PDA改性不改变UiO-66的固有孔结构，且膜的厚度为亚微米级，其CO2渗透率比具有相同选择性的膜高2-3个数量级，最高可达3.7 × 10- 7 molm-2s-1 Pa-1（1115 GPU）。此外，PDA/UiO-66膜具有良好的重现性，在潮湿条件下36 h的测量周期内具有良好的CO2捕获长期稳定性。
In this work, a versatile postmodification strategy based polydopamine (PDA) grafting is reported for improving CO2separation 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 CO2/N2and CO2/CH4selectivities 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 CO2permeance is 2–3 orders of magnitude larger than those membranes with similar selectivity, up to 3.7 × 10–7mol m–2s–1Pa–1(1115 GPU). Moreover, the PDA/UiO-66 membrane with good reproducibility has excellent long-term stability for CO2capture under moist condition in 36 h measurement period.