Enhanced anti-swelling property and dehumidification performance by sodium alginate–poly(vinyl alcohol)/polysulfone composite hollow fiber membranes
► High dehumidification performance is achieved by NaAlg–PVA blend membrane. ► Membrane structure can be facilely tuned by PVA content in the blend. ► The reduced free volume cavity size lowers the membrane swelling degree. Enhanced membrane dehumidification performance was achieved by physically bl...
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Published in | Journal of membrane science Vol. 407-408; pp. 211 - 220 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
15.07.2012
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | ► High dehumidification performance is achieved by NaAlg–PVA blend membrane. ► Membrane structure can be facilely tuned by PVA content in the blend. ► The reduced free volume cavity size lowers the membrane swelling degree.
Enhanced membrane dehumidification performance was achieved by physically blending sodium alginate (NaAlg) with poly(vinyl alcohol) (PVA). Both flat-sheet homogenous membranes and hollow-fiber composite membranes were prepared and characterized by Fourier transform infrared spectra (FT-IR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), positron annihilation lifetime spectroscopy (PALS). When PVA content was 20wt.% and 30wt.%, the blend membranes exhibited lower swelling degree and much higher water/propylene selectivity than both NaAlg and PVA control membranes, resulting from the better-controlled free volume cavity size. In particular, the blend membrane containing 20wt.% PVA showed the best dehumidification performance for propylene-water mixture. Both high water permeance (>10−2cm3(STP)/cm2scmHg) and high selectivity (infinite big) were acquired for 0.13wt.% water in feed under optimized operating conditions (temperature: 298K; feed pressure: 250kPa; feed flowrate: ≥300ml/min). |
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Bibliography: | http://dx.doi.org/10.1016/j.memsci.2012.03.049 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0376-7388 1873-3123 |
DOI: | 10.1016/j.memsci.2012.03.049 |