期刊
MEMBRANES
卷 11, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/membranes11010065
关键词
pervaporation; polylactic acid (PLA); iron metal organic-framework; MOF; methanol; methyl tert-butyl ether (MTBE); organic-organic separation
In this study, a microporous carboxylate metal-organic framework MIL-100 Fe was prepared and used to enhance the selectivity of mixed matrix membranes for methanol separation. The addition of 0.5 wt% Fe-MOF-MW in PLA membranes showed the highest selectivity at 25 degrees Celsius and a vacuum pressure of 0.09 mbar.
A microporous carboxylate metal-organic framework MIL-100 Fe was prepared as submicron particles by microwave-assisted hydrothermal synthesis (Fe-MOF-MW). This product was explored, for the first time, for the preparation of polylactic acid (PLA) mixed matrix membranes. The produced MOF was characterised by powder X-ray diffraction (PXRD), environmental scanning electron microscopy (ESEM) as well as by thermogravimetric analysis (TGA) and nitrogen adsorption/desorption. The effect of different Fe-MOF-MW concentrations (0.1 and 0.5 wt%) on the membrane properties and performance were evaluated. These membranes were used in the pervaporation process for the separation of methanol/methyl tert-butyl-ether mixtures at the azeotropic point. The influence of the feed temperature and vacuum pressure on the membrane performance was evaluated and the results were compared with PLA pristine membranes. Moreover, the produced membranes have been characterised in terms of morphology, MOF dispersion in the polymeric membrane matrix, wettability, thickness, mechanical resistance and swelling propensity. The presence of Fe-MOF-MW was found to have a beneficial effect in improving the selectivity of mixed matrix membranes towards methanol at both concentrations. The highest selectivity was obtained for the PLA membranes embedded with 0.5 wt% of Fe-MOF-MW and tested at the temperature of 25 degrees C and vacuum pressure of 0.09 mbar.
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