膜
渗透
表面改性
材料科学
化学工程
选择性
衍生工具(金融)
扩散
聚合
纳米复合材料
高分子化学
渗透
化学
纳米技术
聚合物
有机化学
复合材料
催化作用
经济
工程类
物理
生物化学
金融经济学
热力学
作者
Ho Jun Lee,Yogita M. Shirke,Jong Seung Kim,Hyun Jung Yu,Cheol Hun Yoo,Seoin Back,Jae-Deok Jeon,Jong Suk Lee
标识
DOI:10.1016/j.memsci.2022.121096
摘要
Herein, we report on highly H2O-selective derivatives of UiO-66-NH2 (UiO) metal-organic frameworks (MOFs) by enhancing the hydrophilic diffusion channels via a combination of hydrophilic modification and defect engineering. The parent framework, hydrophilic (carboxylated or sulfonated) derivatives, a defective derivative, and a defective and carboxylated derivative were prepared to investigate their structure-transport properties. Both experiments and dynamic functional theory simulations demonstrated that the carboxylation of UiO-66-NH2 is more desirable for H2O/N2 separation than sulfonation due to the enhanced hydrophilicity and less reduced surface area. A defect was induced by an acetic acid modulator, which decreased the hydrophilicity of the parent framework due to the methyl end groups; however, it increased the surface area by 38%, possibly enhancing the diffusion channels. In addition, thin-film nanocomposite (TFN) hollow fiber membranes, derived from the incorporation of carboxylated derivatives during interfacial polymerization, exhibited striped Turing structures on their surfaces, providing more efficient water transport channels. A subsequent TFN membrane containing defective and carboxylated derivatives showed the best H2O/N2 separation performance (H2O permeance of 2370 GPU and H2O/N2 selectivity of 769), suggesting a synergistic effect of hydrophilicity and defect-induced surface area. Our current work provides useful insights into fine-tuning the structural and textural properties of both MOFs and the associated composite membranes for air dehumidification.
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