期刊
JOURNAL OF MEMBRANE SCIENCE
卷 489, 期 -, 页码 144-152出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2015.04.012
关键词
Cu-3(BTC)(2) MOF; PVA; Hybrid membrane; Toluene/n-heptane separation; Pervaporation
资金
- National Natural Science Foundation of China [21176007, 21271015, 21322601, 21406006]
- Program for New Century Excellent Talents in University [NCET-13-0647]
- Beijing Municipal Natural Science Foundation [2132013]
As a new type of filler for nanohybrid membranes, metal organic frameworks (MOFs) have attracted intense interest in recent years. In this work, MOF-based Cu-3(BTC)(2)/PVA (BTC=benzene-1,3,5-tricarboxylate, PVA=poly(vinyl alcohol)) nanohybrid membranes were fabricated on a ceramic tubular substrate by using a pressure-driven assembly method. The morphology and structure of the resulting membranes were characterized by scanning electron microscope, energy dispersive X-ray spectrometer, and powder Xray diffraction. The Cu3(BTC)2/PVA membranes were then used in separating 50 wt% toluene/n-heptane mixtures through pervaporation. The effects of PVA concentration, Cu-3(BTC)(2) loading, teed composition, and operating temperature on membrane performances were explored. The results indicate that, compared with pristine PVA membrane, the separation factor and permeate flux of optimized Cu-3(BTC)(2)/PVA membranes are improved from 8.9 and 14 g/(m(2) h) to 17.9 and 133 g/(m(2) h), respectively. A speculation of the transport process of permeating components in the selective layer of Cu-3(BTC)(2)/PVA membrane was proposed. Enhanced affinity between toluene and the membrane through incorporating Cu-3(BTC)(2) particles plays a key role in improving separation performances. (C) 2015 Elsevier BM. All rights reserved.
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