Two-dimensional metal-porphyrin framework membranes for efficient molecular sieving
Two-dimensional metal-porphyrin framework membranes for efficient molecular sieving
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用于高效分子筛分的二维金属卟啉骨架膜
DOI：
10.1016/j.memsci.2021.119812
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发表时间：
2021-09-13
影响因子：
9.5
通讯作者：
Xia, Shengji
中科院分区：
文献类型：
--
作者：
Cheng, Peng;Huang, Yidi;Xia, Shengji
二维（2D）膜的构建使用卟啉为基础的金属有机框架（MOFs），即。即，铜-四（4-羧基苯基）卟啉（Cu-TCPP），用于染料/盐混合物溶液的有效分子筛。这些新型膜含有通过真空过滤方法制造的规则Cu-TCPP纳米片过滤层，以保留MOF材料的取向夹层结构，从而产生稳健的2D膜。厚度为300 nm的水合Cu-TCPP膜显示出对直径约大于1.3 nm的染料的高保留率（对结晶紫（CV）为90.1%，对Chrome黑T（CB-T）为93.3%，对甲基蓝（MB）为99.7%，对刚果红（CR）为99.8%; CV，Mw= 407.9 g/mol; CB-T，Mw=416.4 g/mol）。用最佳金属卟啉骨架膜（小层状尺寸纳米片）对染料/盐混合物溶液进行24 h的错流模式过滤，获得了840.11·m（-2）·h（-1）bar（-1）的水渗透率和99.9%的CR（Mw= 696.7 g/mol）截留率。更重要的是，由于Cu-TCPP膜具有丰富的中间层和规则的表面纳米通道，其对NaCl的截留率仅为0.4%，而对CR/NaCl的选择性高达249.5，与其他二维膜相比具有更高的上级性能。此外，膜的纳米通道在高达0.4 MPa的压力负荷下呈现出强刚性，赋予膜高剪切应力耐受性和良好的抗污性能后，几个污垢清洗循环。
Two-dimensional (2D) membranes were constructed using porphyrin-based metal organic frameworks (MOFs), i. e., copper-tetrakis(4-carboxyphenyl) porphyrin (Cu-TCPP), for efficient molecular sieving of dye/salt mixture solutions. These novel membranes contained a regular Cu-TCPP nanosheet filter layer fabricated by the vacuum filtration method to retain the oriented interlayer structure of the MOF material, resulting in a robust 2D membrane. The hydrated Cu-TCPP membrane with a thickness of 300 nm displayed high retention rates for dyes (90.1% for crystal violet (CV), 93.3% for Chrome black T (CB-T), 99.7% for Methyl blue (MB) and 99.8% for Congo red (CR); CV, Mw= 407.9 g/mol; CB-T, Mw=416.4 g/mol) with diameters approximately greater than 1.3 nm. A water permeance of 840.1 1,m(-2).h(-1) bar(-1) and a CR (Mw= 696.7 g/mol) rejection rate of 99.9% were obtained with the optimal metal-porphyrin framework membrane (small lamellar dimension nanosheets) undergoing the cross-flow mode filtration of dye/salt mixture solutions for 24 h. More importantly, due to the abundant interlayers and regular surface nanochannels, the Cu-TCPP membrane exhibited a low salt rejection rate (0.4% for NaCl) and an outstanding CR/NaCl selectivity (as high as 249.5), which was more superior compared with that of other reported two-dimensional membranes. Additionally, the nanochannels of the membrane presented strong rigidity under pressure load as high as 0.4 MPa, endowing the membrane with high tolerance to shear stress and good antifouling performance after several fouling-cleaning cycles.