Preparation and Characterization of Modified Graphene Oxide/Polyethersulfone Positively Charged Hybrid Nanofiltration Membrane†

doi:10.7503/cjcu20130962

Abstract

Abstract:

Graphene oxide(GO) has received tremendous attention thanks to its unique two-dimensional feature, fantastic mechanical and chemical properties. In this paper, GO was fabricated and then was modified by chitosan. After the quaternization of modified GO, the positively charged material was used as inorganic additive to prepare polyethersulfone(PES) hybrid nanofiltration membrane with phase inversion method using N,N-dimethylacetamide(DMAc) as solvent, polyvinylpyrrolidone(PVP) as pore-forming agent. The effect of modified GO content on the separating property of hybrid membranes was investigated. The results suggested that the positively charged nanofiltration membranes were prepared successfully without the changes of morphology. With the increase of modified GO content, the water flux and separation selectivity of hybrid membranes were improved significantly and it was proposed that the best additive quantity of modified GO was round 0.5%(mass fraction).

Key words: Graphene oxide, Chitosan, Polyethersulfone nanofiltration membrane, Desalination

CLC Number:

O631
TQ028.8

TrendMD:

YU Liang, ZHANG Yatao, LIU Jindun. Preparation and Characterization of Modified Graphene Oxide/Polyethersulfone Positively Charged Hybrid Nanofiltration Membrane^†[J]. Chem. J. Chinese Universities, 2014, 35(5): 1100.

Figures/Tables 10

Scheme 1 Preparation process of the QAGO-Cs

Table 1 Composition of the casting solutions

Sample	w(PES)(%)	w(QAGO-Cs)(%)	w(PVP)(%)	w(DMAc)( %)	t/s
0	20.32	0	1	78.68	60
1	20.32	0.25	1	78.66	60
2	20.32	0.50	1	78.64	60
3	20.32	1.00	1	78.62	60

Fig.1 IR spectra of GO(a), GO-Cs(b) and QAGO-Cs(c)

Fig.2 XRD patterns of pristine graphite(a) and GO(b)

Fig.3 Thermo gravimetric analysis(TGA) curves of pristine graphite(a) and GO(b)

Fig.4 TEM images of GO nanosheets at different magnifications

Fig.5 SEM images of the cross-section of pure PES membrane(A) and hybrid membrane with QAGO-Cs mass fraction of 0.5%(B)

Fig.6 Effect of modified GO content on water ratio and water contact angle of hybrid membrane

Fig.7 Effect of modified GO content on ion exchange capacity

Fig.8 Effect of modified GO content on pure water flux and rejections of hybrid membrane

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