期刊
MATERIALS
卷 15, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/ma15082807
关键词
covalent organic framework (COF); imine-COF; fluorinated COF; mixed-matrix membrane (MMM); CO2; CH4 separation
类别
资金
- DFG [SPP 1928, Ja466-43/1]
A catalyst-free Schiff base reaction was used to synthesize two imine-linked covalent organic frameworks. The resulting products were characterized and found to have high surface areas. The larger-scale synthesis products were applied to prepare mixed-matrix membranes, with one of the membranes exhibiting higher CO2/CH4 selectivity and permeability.
A catalyst-free Schiff base reaction was applied to synthesize two imine-linked covalent organic frameworks (COFs). The condensation reaction of 1,3,5-tris-(4-aminophenyl)triazine (TAPT) with 4,4 '-biphenyldicarboxaldehyde led to the structure of HHU-COF-1 (HHU = Heinrich-Heine University). The fluorinated analog HHU-COF-2 was obtained with 2,2 ',3,3 ',5,5 ',6,6 '-octafluoro-4,4 '-biphenyldicarboxaldehyde. Solid-state NMR, infrared spectroscopy, X-ray photoelectron spectroscopy, and elemental analysis confirmed the successful formation of the two network structures. The crystalline materials are characterized by high Brunauer-Emmett-Teller surface areas of 2352 m(2)/g for HHU-COF-1 and 1356 m(2)/g for HHU-COF-2. The products of a larger-scale synthesis were applied to prepare mixed-matrix membranes (MMMs) with the polymer Matrimid. CO2/CH4 permeation tests revealed a moderate increase in CO2 permeability at constant selectivity for HHU-COF-1 as a dispersed phase, whereas application of the fluorinated COF led to a CO2/CH4 selectivity increase from 42 for the pure Matrimid membrane to 51 for 8 wt% of HHU-COF-2 and a permeability increase from 6.8 to 13.0 Barrer for the 24 wt% MMM.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据