Preparation and Filtration Performance of Antifouling PVA/PVDF Composite Ultrafiltration Membrane Based on Electrospinning Technology†

doi:10.7503/cjcu20160429

Abstract

Abstract:

A composite ultrafiltration membrane containning polyethylene terephthalate(PET) non-woven fabric substrate and poly(vinylidene fluoride)(PVDF) nanofibers as support layer, polyvinyl alcohol(PVA) nanofiber membrane for barrier layer was prepared using electrospinning method. A mixture of acetone and water solution was used for crosslinking treatment to form the dense barrier layer. The ultrafiltration membranes were characterized by Fourier transform infrared(FTIR) spectroscopy, scanning electron micrograph(SEM) and water contact angle(WCA). Filtration performance of the resulting PVA/PVDF composite ultrafiltration membranes was evaluated by the oil/water emulsions separation system. The results showed that the optimal composite ultrafiltration membrane possessed general flux[(42.50±4.78) L/(m²·h)] and high rejection rate[(95.72±0.33)%] at very low feeding pressure(0.02 MPa), after 5 times recycled, it still has good filter performance. The pure water flux using the dead-end filtrationof composite ultrafiltration membrane at atmospheric pressure was [(3469±28) L/(m²·h)].

Key words: Electrospinning, Solution treatment, Ultrafiltration, Antifouling

CLC Number:

TrendMD:

WU Linghui, WANG Bin, WANG Jiaona, LI Congju. Preparation and Filtration Performance of Antifouling PVA/PVDF Composite Ultrafiltration Membrane Based on Electrospinning Technology^†[J]. Chem. J. Chinese Universities, 2016, 37(12): 2306.

Figures/Tables 12

Scheme 1 Fabrication flow chart of the composite ultrafiltration membrane with PET non-woven fabric as substrate and PVDF nanofibers as middle layer and PVA nanofibers as the barrier layer

Scheme 2 Schematic diagram of dead-end filtration system

Fig.1 SEM images of electrospun nanofibers(A, C) and their diameter distribution(B, D)(A, B) PVDF nanofiber; (C, D) PVA nanofiber.

Fig.2 Rejection rate of oil/water emulsion filtered by the composite film with different PVDF electrospinning time at atmospheric pressure

Fig.3 SEM images of composite ultrafiltration membrane surface morphology with different PVA nanofibers electrospinning timeTime/h: (A) 1; (B) 2; (C) 3; (D) 4; (E) 5.

Fig.4 Surface morphology of composite ultrafiltration membrane at different crosslinked temperatures Temperature/℃: (A) 20; (B) 30; (C) 40; (D) 50 ; (E) 60.

Table 1 Massloss rates and swelling degrees of the composite ultrafiltration membranes under different crosslinking temperatures

Temperature/℃	20	30	40	50	60
m_L(%)	0.38	0	0.35	0.13	0.25
m_S(%)	80.08	70.82	74.35	73.15	69.59

Fig.5 FTIR spectra of crosslinked PVA(a) and non-crosslinked PVA(b)

Fig.6 Water contact angles of different nanofiber layers(A) PVDF layer; (B) PVA layer; (C) crosslinked PVA layer; (D) cross-section morphology of (C).

Fig.7 Separation of the dead-end filtration usingthe composite ultrafiltration membrane with different PVA electrospinning time(A) Change of the flux by filter oil/water emulsions; (B) change of the rejection rate by filter oil/water emulsions; (C) change of the flux by filter pure water. Time/h: a. 1; b. 2; c. 3; d. 4; e. 5.

Fig.8 Change of the flux and rejection rate over 5 cycles

Table 2 The loss rate(Rl) and flux recovery rate(Rr) of the composite ultrafiltration membrane after recycling

Number of recycle	1	2	3	4	5
R_l(%)		26.17	28.99	27.97	26.73
R_r(%)		73.83	71.01	72.03	73.27

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