Jiaqi Liu,Fuyi Sun,Yuanyuan Che,Kaihuan Nie,Zhihao Zhang,Zhen Yang,Liangliang Lin
Metal organic frameworks (MOFs) have shown widespread applications in many aspects owing to their unique structures. In this study, a thin and homogenous UTSA-280/PEI-HPAN nanofiltration membrane was fabricated by combining interfacial reaction and in-situ self-assembly reaction, which showed rejections of 83.79%, 86.17%, 99.42% and 98.93% for MO, AF, MB and CR solutions together with permeances up to 262.54, 197.51, 145.97 and 170.63 L·m −2 ·h −1 ·MPa −1 , respectively. In addition, the UTSA-280/PEI-HPAN membranes demonstrated a preferable stability in 48 h continuous test, a good anti-fouling property in both HA and BSA fouling test and an outstanding reusability, and they also showed high permeances and rejections even after four cycles. The results indicate that the stable UTSA-280/PEI-HPAN hybrid membrane with high separation performances can be a promising material for wastewater treatment .
Xi Chen,Guining Chen,Guozhen Liu,Gongping Liu,Wanqin Jin
Mixed-matrix membranes (MMMs), judiciously combining processability of polymer and remarkable separation performance of nanofillers, have been extensive pursuits for molecular separation process. Permeability matching between filler and polymer is one of the necessary requisites to desirable mixed-matrix effect. Considering the superior molecular sieving effect of UTSA-280 metal-organic frameworks on C 2 H 4 and C 2 H 6 , here, we report two types of UTSA-280/6FDA-polyimide MMMs toward C 2 H 4 /C 2 H 6 separation. The molecular sieving effect of UTSA-280 endowed 6FDA-DAM:DABA(3:2) membrane with simultaneous improvements in C 2 H 4 permeability and C 2 H 4 /C 2 H 6 selectivity. Optimally, when the filler reached 21.80 wt%, C 2 H 4 permeability and C 2 H 4 /C 2 H 6 selectivity was increased to 6.49 Barrer (by 15%) and 4.94 (by 32%), respectively. On the contrary, UTSA-280/6FDA-DAM MMMs showed undesirable mixed-matrix effect that C 2 H 4 permeability decreased meanwhile C 2 H 4 /C 2 H 6 selectivity nearly kept at polymeric pristine membrane level. It was found that permeability matching between two phases was responsible to these opposite mixed-matrix effects. More specifically, UTSA-280 had a relatively low gas permeability so that it required a less permeable polymeric matrix like 6FDA-DAM:DABA(3:2) to exert its molecular sieving effect. Furthermore, the optimal-matching 6FDA-matrix in permeability with UTSA-280 fillers was predicted by theoretical model. This work not only reports improving C 2 H 4 /C 2 H 6 separation performance via mixed-matrix formulation, but also emphasizes the importance of permeability matching between polymer and filler to realize the mixed-matrix effect.
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