PIM-1 mixed matrix membranes incorporated with magnetic responsive cobalt-based ionic liquid for O2/N2 separation
PIM-1 mixed matrix membranes incorporated with magnetic responsive cobalt-based ionic liquid for O2/N2 separation
复制标题
DOI：
10.1016/j.memsci.2023.121713
复制
发表时间：
2023-05
影响因子：
9.5
通讯作者：
Hongyong Zhao;Tingle Song;Xiaoli Ding;Ruyi Cai;X. Tan;Yuzhong Zhang
中科院分区：
文献类型：
--
作者：
Hongyong Zhao;Tingle Song;Xiaoli Ding;Ruyi Cai;X. Tan;Yuzhong Zhang
膜法分离O2/N2是一种成熟的工业装置。具有优异渗透分离性能的膜仍然是关键的要求之一。钴基化合物对O2具有良好的亲合性，可以促进O2的传递，提高膜的O2/N2选择性。此外，钴基化合物具有磁响应效应，这可以导致在磁场下O2/N2分离的进一步改善。制备了一类含钴基离子液体（CILs）@聚芳酯（芳香族聚酯）（PAR）（核-壳）复合纳米球（CILs@PAR（c-s）CNPs）的PIM-1混合基质膜（MMM）。通过傅里叶变换红外光谱（FTIR）测定CILs@PAR（核-壳）CNP的化学组成。用透射电子显微镜（TEM）观察了CILs@PAR（核-壳）CNPs的形态和结构。测试了CIL @PAR（核-壳）CNP的气体吸附性能。采用热重-差示扫描量热法（TGA-DSC）研究了（CILs@PAR（c-s）CNPs）/PIM MMM的热性能。还报道了（CIL @PAR（c-s）CNP）/PIM MMM的气体渗透-分离性能。与原PIM-1膜相比，（CILs@PAR（c-s）CNPs）/PIM MMM具有更高的O2/N2选择性，这是由于钴基离子液体作为O2载体，同时降低了O2渗透性。随着CILs@PAR（c-s）CNPs含量的增加，O2/N2选择性增加，O2渗透性降低。研究还发现，在MMM上施加磁场后，O2/N2选择性进一步提高，且随着CILs@PAR（c-s）CNPs含量的增加，O2/N2选择性提高得更多.因此，（CILs@PAR（c-s）CNPs）/PIM MMM在180 mT磁场下表现出良好的O2/N2选择性和良好的O2渗透性，O2/N2选择性分别为1000 ~ 1500 Barrer和1000 ~ 1400 Barrer，具有很大的空分应用潜力。
Membrane technology for O2/N2separation is a mature industrial unit. Membranes with excellent permeation-separation performance are still one of the critical requirements. The cobalt-based compounds have been well known for their good affinity for O2, which can facilitate O2transfer and improve the O2/N2selectivity in membranes. The cobalt-based compounds, moreover, have a magnetic responsive effect, which can lead to a further improvement in O2/N2separation under a magnetic field. A class of PIM-1 mixed matrix membranes (MMMs), containing cobalt-based ionic liquid (CILs)@polyarylate (aromatic polyester) (PAR) (core-shell) composite nanospheres (CILs@PAR (c-s) CNPs), were prepared. Chemical compositions of CILs@PAR (core-shell) CNPs were determined by Fourier transform infrared spectroscopy (FTIR). Morphologies and structures of CILs@PAR (core-shell) CNPs were observed by transmission electron microscopy (TEM). Gas adsorption properties of CILs@PAR (core-shell) CNPs were tested. Thermal properties of the (CILs@PAR (c-s) CNPs)/PIM MMMs were investigated by simultaneous thermal analysis (TGA-DSC). Gas permeation-separation performances of the (CILs@PAR (c-s) CNPs)/PIM MMMs were also reported. Compared with the original PIM-1 membrane, the (CILs@PAR (c-s) CNPs)/PIM MMMs display higher O2/N2selectivity because of cobalt-based ionic liquid as O2carrier, coupled with a reduction in O2permeability. With increasing the content of the CILs@PAR (c-s) CNPs, the O2/N2selectivity increases, and the O2permeability decreases. It is also found that, as a magnetic field on the MMMs, the O2/N2selectivity further increases; and it increases more, as a higher content of CILs@PAR (c-s) CNPs. Therefore, the (CILs@PAR (c-s) CNPs)/PIM MMMs exhibit excellent O2/N2selectivity of ∼5 coupled with good O2permeability of ∼140 Barrer under a 180 mT magnetic field and show great potential for air separation.