Fabrication of a freestanding metal organic framework predominant hollow fiber mat and its potential applications in gas separation and catalysis
Fabrication of a freestanding metal organic framework predominant hollow fiber mat and its potential applications in gas separation and catalysis
复制标题
DOI：
10.1039/c9ta11701f
复制
发表时间：
2020-02-21
影响因子：
11.9
通讯作者：
Parsons, Gregory N.
中科院分区：
文献类型：
--
作者：
Dai, Zijian;Lee, Dennis T.;Parsons, Gregory N.
近年来，基于金属有机骨架（MOF）的聚合物基底在许多工程和技术领域显示出良好的性能。然而，M0 F/聚合物复合材料的公知缺点是M0 F晶体封装和表面积减小。这项工作报告了一种简单温和的策略，以生产自支撑的MOF占主导地位的中空纤维垫。我们的合成方法成功地制备了包括MIL-53（Al）-NH 2，Al-PMOF和ZIF-8在内的各种中空MOFs。该合成策略结合了金属氧化物在聚合物纤维上的原子层沉积（ALD）和随后的聚合物组分的选择性去除，然后将剩余的中空金属氧化物转化为独立的MOF主导的中空纤维结构。中空MOFs显示出增大的表面积、极好的孔隙率和优异的孔可及性，并且在CO2吸附（3.30 mmol g（-1））、CO2/N-2分离选择性（对于15/85和50/50 CO2/N-2混合物为24.9和21.2）和HCHO的催化去除（在60 min内完全氧化150 ppm）方面表现出显著改善的性能。
Recently, metal-organic framework (MOF)-based polymeric substrates show promising performance in many engineering and technology fields. However, a commonly known drawback of MOF/polymer composites is MOF crystal encapsulation and reduced surface area. This work reports a facile and gentle strategy to produce self-supported MOF predominant hollow fiber mats. A wide range of hollow MOFs including MIL-53(Al)-NH2, Al-PMOF, and ZIF-8 are successfully fabricated by our synthetic method. The synthetic strategy combines atomic layer deposition (ALD) of metal oxides onto polymer fibers and subsequent selective removal of polymer components followed by conversion of remaining hollow metal oxides into freestanding MOF predominant hollow fiber structures. The hollow MOFs show boosted surface area, superb porosity, and excellent pore accessibility, and exhibit a significantly improved performance in CO2 adsorption (3.30 mmol g(-1)), CO2/N-2 separation selectivity (24.9 and 21.2 for 15/85 and 50/50 CO2/N-2 mixtures), and catalytic removal of HCHO (complete oxidation of 150 ppm within 60 min).