Hollow fiber membrane supported metal organic framework-based packed bed for gas/vapor adsorption
Hollow fiber membrane supported metal organic framework-based packed bed for gas/vapor adsorption
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DOI：
10.1016/j.cej.2022.140228
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发表时间：
2022-11
影响因子：
15.1
通讯作者：
Yufeng Song;K. Sirkar
中科院分区：
文献类型：
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作者：
Yufeng Song;K. Sirkar
具有高孔隙率的结晶金属有机框架（MOFs）对各种气体具有高吸附能力。它们的易碎和粉状特性促使人们做出了大量努力来制备成型体，用于吸附器的小球、颗粒。采用基于中空纤维膜的策略，因为中空纤维膜（HFM）模块由于每单位装置体积提供的非常高的表面积和它们的容易的可扩展性而高度优选用于工业分离过程。我们在此报道了溶剂热合成方法，其中MOF的纳米晶体U10 -66-NH 2直接在尼龙6的亲水性中空纤维膜的亚微米孔内以及在HFM的孔中合成。约100 nm的纳米晶体填充HFM孔。研究了在膜孔、HFM孔和额外的毛细管空间中含有这种HFM和MOF纳米晶体和微晶的圆柱形模块从稀气流中吸附氨。实现了高的氨穿透时间值。研究了膜孔中的MOF、膜孔中的MOF和HFM孔以及膜孔、HFM孔和毛细管外空间中的MOF的相应行为。达到的时间/MOF重量的值非常高。采用扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、粉末X射线衍射仪（PXRD）、BET吸附等温线、比表面积和孔径分布等对所合成的MOFs进行表征。用于气体/蒸气吸附的HFM支撑的基于M0 F的可缩放装置的高性能已经被证明具有20，000 min/g M0 F的值，用于来自所采用的湿氨进料气流的痕量氨穿透。还讨论了这种装置用于吸附2 - 3种气体和液相吸附的其它潜在用途。
Crystalline metal–organic frameworks (MOFs) with high porosity have high sorption capacities for various gases. Their fragile and pulverulent characteristics have prompted significant efforts to prepare shaped bodies e.g., pellets, granules for use in adsorbers. A hollow fiber membrane-based strategy is adopted since hollow fiber membrane (HFM) modules are highly preferred for industrial separation processes due to very high surface area provided per unit device volume and their easy scalability. We report herein a solvothermal synthesis method whereby nanocrystals of the MOF, UiO-66-NH2, are synthesized directly inside submicron pores of hydrophilic hollow fiber membranes of Nylon 6 as well as in the bores of the HFMs. Nanocrystals of around 100 nm populate HFM pores. Cylindrical modules containing such HFMs and MOF nanocrystals and microcrystals in membrane pores, HFM bores and the extra capillary space were studied for adsorption of ammonia from a dilute gas stream. High values of ammonia breakthrough time were achieved. The corresponding behaviors of three MOF configurations namely, MOF in membrane pores, MOF in membrane pores and the HFM bores and MOF present in membrane pores, HFM bores and in extra capillary space were studied. The values of time/MOF weight achieved were very high. The MOFs synthesized were characterized by Scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), powder X-ray diffractometer (PXRD), Brunauer-Emmett-Teller (BET) adsorption isotherms, surface area, and pore size distribution. High performance of HFM-supported MOF-based scalable devices for gas/vapor adsorption has been demonstrated with values of 20,000 min/g of MOF for trace ammonia breakthrough from humid ammonia feed gas stream employed. Other potential uses of such devices for adsorbing 2 to 3 gases and liquid phase adsorption have also been discussed.