ZIF-8 nanoparticles with tunable size for enhanced CO2 capture of Pebax based MMMs
| Autor: | Rui Ding, Wenji Zheng, Gaohong He, Kai Yang, Yan Dai, Xiaoming Yan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Materials science Nanoparticle Filtration and Separation 02 engineering and technology Polymer 021001 nanoscience & nanotechnology Analytical Chemistry Membrane 020401 chemical engineering chemistry Chemical engineering Specific surface area Barrer Microemulsion 0204 chemical engineering 0210 nano-technology Selectivity BET theory |
| Zdroj: | Separation and Purification Technology. 214:111-119 |
| ISSN: | 1383-5866 |
| Popis: | 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/N2 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 N2. At 5 wt.% loading of ZIF-8-90, the MMM presents the best separation performance with CO2 permeability of 99.7 Barrer and CO2/N2 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. |
| Databáze: | OpenAIRE |
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