期刊
JOURNAL OF MEMBRANE SCIENCE
卷 652, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2022.120473
关键词
UiO-66; Chitosan; Mixed-matrix membrane; Pervaporation; methanl/dimethyl carbonate
资金
- National Natural Science Foundation of China [22038006, 21922805]
- Natural Science Research General Project at Colleges and Universities in Jiangsu Province [21KJB530008]
Pervaporation of organic-organic mixtures is a promising technique, and incorporating UiO-66 (ZrCl4) metal-organic frameworks into chitosan membranes can enhance their separation performance for methanol-dimethyl carbonate mixtures. The presence of UiO-66 (ZrCl4) nanofillers improves the permeation flux and separation factor, surpassing polymer-based membranes.
Pervaporation shows great potential in separation of organic-organic mixtures that are widely involved in chemical and petrochemical industries, while the separation performance of polymeric membranes is undesirable for practical application. In this work, we incorporated UiO-66 (ZrCl4) metal-organic frameworks (MOFs) into chitosan (CS) membrane to separate methanol-dimethyl carbonate (DMC) mixtures. ZrOCl2 center dot 8H(2)O or ZrCl4 was selected as metal precursor to synthesize UiO-66, which aimed to investigate the structural defect of UiO-66 for the separation performance of mixed matrix membranes (MMMs). BET, H-1 NMR and low-angle XRD characterizations indicated that UiO-66 (ZrCl4) with appropriate pore size is more suitable for preferentially permeate methanol over DMC. IR, dielectric relaxation and DSC characterizations combined with molecular simulations revealed the ideal interfacial morphology of UiO-66/CS MMMs was owing to the favorable molecular interactions including hydrogen bond interaction and van der Waals interaction. Pervaporation separation of methanol-DMC mixtures demonstrated that UiO-66 (ZrCl4) nanofillers can simultaneously enhance the permeation flux and separation factor of CS membrane. The optimized 10 wt% UiO-66 (ZrCl4)/CS MMM exhibited total flux and methanol/DMC separation factor of 355 g/m(2)h and 337 for 10 wt% methanol-DMC mixtures at 50 degrees C, which were 3.4-fold and 25-fold higher than that of the pure CS membrane, respectively, and outperformed the state-of-the-arts polymer-based membranes.
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