Preparation and Properties of Composite Filtration Membranes Containing Energy-storage Nanofibers†

doi:10.7503/cjcu20140619

Abstract

Abstract:

Two type of composite membranes(NFCM) containing poly(stearyl methacrylate)(PSMA)/poly(ethylene terephthalate)(PET) nanofiber supporting layer, prepared by coaxial electrospinning technology, and poly(vinylidene fluoride)(PVDF) substrate, were prepared using water or ethanol as the coagulation solution. NFCM has the low pressure and high water flux against the bulk PVDF membrane at the same condition. The morphological structure, the pure water flux and the rejection of NFCM show the strong dependence upon the solvent-treated process. The water flux of NFCM@EtOH is in the range from 100 to 1400 L/(m²·h); while for NFCM@H₂O, its water flux only is between 40 and 220 L/(m²·h), indicating that EtOH shows the greatly influence on the surface porosity of membrane. The tensile strength of membrane changes from 0.925 MPa of the original PVDF to 4.28 MPa of NFCM, demonstrating that the incorporated nanofibers can effectively improve the mechanical property of PVDF membrane. Obvious thermal behaviour and the temperature buffering ability appear in NFCM, and it exhibits an active response when temperature is below 50 ℃. The slowdown amplitude of water flux with temperature is observed in NFCM as compared with the control. The prepared NFCM containing PSMA/PET nanofiber as the supporting layer provides a way to obtain the high-performance composite membrane with the high water flux.

Key words: Energy-storage nanofiber, Electrospinning, Water flux, Poly(vinylidene fluoride), Composite membrane

CLC Number:

O631

TrendMD:

WANG Haixia, LIU Minqiao, CUI Jianping, SHI Haifeng, Qi Lu, WANG Dujin. Preparation and Properties of Composite Filtration Membranes Containing Energy-storage Nanofibers^†[J]. Chem. J. Chinese Universities, 2014, 35(12): 2713.

Figures/Tables 8

Fig.1 SEM image(A) of PSMA/PET coaxial nanofibers and DSC heating(a, b) and cooling(c, d) results(B) of PSMA bulk(a, c) and PSMA/PET coaxial nanofibers(b, d) Insert of (A): TEM image of PSMA/PET coaxial nanofibers.

Fig.2 SEM images of NFCM with H2O(A1, B1) and EtOH(A2, B2) as coagulation solution, respectively (A1, A2) Top surface; (B1, B2) bottom surface; (C1, C2) cross section of NFCM. Insets of (C1) and (C2): the enlarged parts of the marked black circle lines.

Fig.3 Relationship of water flux of NFCM@EtOH(a) and NFCM@H2O(b) with the thickness of nanofibers

Fig.4 Relationship of rejection of BSA as a function of water flux of NFCM@EtOH

Fig.5 DSC heating and cooling curves of NFCM and PVDF membranes

Fig.6 Compared relationship of water flux in PSMA/PET and PET nanofiber-based membrane coagulated by EtOH as a function of temperature a. PET nanofber@50 μm; b. PSMA/PET nanofber@44 μm; c. PSMA/PET nanofber@70 μm; d. PSMA/PET nanofber@161 μm; e. PSMA/PET nanofber@205 μm.

Fig.7 Contact angles(CA) of PVDF@H2O(A), PVDF@EtOH(B), NFCM@H2O(C) and NFCM@EtOH(D)

Fig.8 Typical stress-strain curves of NFCM at the different coagulation solution with the controlled membrane thickness a. NFCM@H2O-77 μm; b. NFCM@H2O-99 μm;c. NFCM@H2O-143 μm; d. NFCM@H2O-151 μm.

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