期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 214, 期 -, 页码 111-119出版社
ELSEVIER
DOI: 10.1016/j.seppur.2018.04.010
关键词
Pebax; Mixed matrix membranes; CO2 capture; Size-tunable ZIF-8
资金
- National Natural Science Foundation of China [21506028, 21706023]
- Changjiang Scholars Program [T2012049]
- Education Department of the Liaoning Province of China [LT2015007]
- Fundamental Research Funds for the Central Universities [DUT16TD19]
- State Key Laboratory of Fine Chemicals [KF1616]
Poly (ether-block-amide) (Pebax) based mixed matrix membranes (MMMs) were prepared by using size-tunable ZIF-8 nanoparticles as fillers. ZIF-8 nanoparticles with sizes of 40, 60, 90 and 110 nm (ZIF-8-40, ZIF-8-60, ZIF-8-90 and ZIF-8-110) were synthesized in microemulsion by controlling the ratio of Zn2+ to Hmim (1:16, 1:8, 1:5, 1:2). And they were distributed uniformly in Pebax matrix without obvious agglomerations and defects at the loading of 0-20 wt.%, which was confirmed by field-emission scanning electron microscopy (FE-SEM). The incorporation of ZIF-8 resulted in a significant improvement in CO2 permeability and the CO2/N-2 selectivity increased with the BET surface area of ZIF-8 increasing. The enhanced permeability is attributed to an improvement in the free volume of the polymer induced by larger sized ZIF-8, while the increased selectivity results from the high specific surface area of large sized ZIF-8, which can provide more active sites for CO2 capture and great mass transfer resistance for N-2. At 5 wt.% loading of ZIF-8-90, the MMM presents the best separation performance with CO2 permeability of 99.7 Barrer and CO2/N-2 selectivity of 59.6, both of which are increased by about 25% by comparison to the pure Pebax membrane. The present study provides an effective way to obtain size-controlled ZIF-8 fillers and high separation performances of Pebax based MMMs.
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