Li Feng, Liu Theo Dongyu, Xie Silijia, Guan Jian, Zhang Sui
Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore.
ChemSusChem. 2021 Jun 8;14(11):2452-2460. doi: 10.1002/cssc.202100335. Epub 2021 May 7.
Metal-organic frameworks (MOFs) are promising candidates for membrane-based liquid separations due to their intrinsic microporosity, but many are limited by their insufficient stability. In this work, a copper-benzoquinoid (Cu-THQ) MOF was synthesized and demonstrated structural stability in water and organic solvents. After incorporation into the polyamide layer, the hydrophilicity of the membranes was enhanced. The resultant thin-film nanocomposite (TFN) membranes broke the permeability-selectivity tradeoff by showing 242 % increase in water permeance and slightly enhanced salt rejection at MOF loading of 0.0192 mg cm . The underlying mechanism was probed by different chemical and morphological characterizations. The membranes also showed improved tolerance to chlorine oxidation. With their excellent stability, the Cu-THQ MOF-based membranes further demonstrated impressive performance in organic solvent nanofiltration involving dimethylformamide.
金属有机框架材料（MOFs）因其固有的微孔结构而有望成为基于膜的液体分离材料，但许多材料因其稳定性不足而受到限制。在这项工作中，合成了一种铜苯醌（Cu-THQ）MOF，并证明了其在水和有机溶剂中的结构稳定性。将其掺入聚酰胺层后，膜的亲水性得到增强。所得的薄膜纳米复合（TFN）膜在MOF负载量为0.0192 mg cm时，水通量增加了242%，同时盐截留率略有提高，打破了渗透率-选择性之间的权衡。通过不同的化学和形态表征探究了其潜在机制。这些膜还表现出对氯氧化的耐受性提高。基于Cu-THQ MOF的膜具有优异的稳定性，在涉及二甲基甲酰胺的有机溶剂纳滤中进一步展现出令人印象深刻的性能。
