Preparation and Property of Polyethersulfone Ultrafiltration Membranes with Mesoporous-graphitic-C3N4/Ag

doi:10.15541/jim20180308

Abstract

Abstract:

Membrane fouling is still the major problem for the application of membrane separation. In this study, different amounts of silver doped mesoporous graphitic carbon nitride (m-g-C₃N₄/Ag) were introduced into casting solution by blending. The polyethersulfone (PES) nanocomposite membrane was prepared via the phase-inversion method. The impacts of m-g-C₃N₄/Ag addition on the morphology, filtration, antibacterial, photocatalytic, and antifouling properties of nanocomposite membrane were systematically studied. The results showed that the addition of m-g-C₃N₄/Ag can improve the cross-section structure of the nanocomposite membrane as well as its surface hydrophilicity. Compared with pure PES membrane, the pure water flux of the modified nanocomposite membrane increased significantly with the increase of doping amount. The protein rejection rates of all samples were over 90%, indicating that the addition of m-g-C₃N₄/Ag can significantly improve the filtration performance of the nanocomposite membrane without sacrificing the rejection performance. The anti-bacterial activity of the nanocomposite membranes was improved with the increase of m-g-C₃N₄/Ag content in which the anti-bacterial activity to P. aeruginosa was much more significant than that to E. coli. The pure PES membrane almost had not photodegradation under light irradiation. By contrast, all nanocomposite membranes exhibited good photocatalytic properties under visible light irradiation, and the photocatalytic activity improved with increase of m-g-C₃N₄/Ag. The nanocomposite membrane in which the m-g-C₃N₄/Ag content was the highest that showed the optimal photocatalysis, and the decolorization rate of methyl orange reached 63% in 120 min. The comprehensive antifouling performances of all membranes were characterized by four-step filtration experiments. It can be seen that the flux recovery ratio (FRR) of all nanocomposite membranes is much higher than that of PES membrane. The FRR of all membranes was further increased after washing with water and irradiating with visible light. In summary, the addition of m-g-C₃N₄/Ag can endow the PES membrane with the antibacterial and the photocatalytic properties under visible light irradiation, thereby improving its comprehensive antifouling performance.

Key words: m-g-C₃N₄/Ag, polyethersulfone membrane, antibiosis, photocatalysis, antifouling

CLC Number:

TQ028

Zi-Ya LIU, Ru-Ya CAO, Man-Ying ZHANG. Preparation and Property of Polyethersulfone Ultrafiltration Membranes with Mesoporous-graphitic-C₃N₄/Ag[J]. Journal of Inorganic Materials, 2019, 34(5): 478-486.

Figures/Tables 12

Table 1 Composition of dope solution

Membrane abbreviation	Silver content/wt%	PES/wt%	DMF/wt%
M0	0	18	82.0
M1	0.1	18	81.9
M2	0.3	18	81.7
M3	0.5	18	81.5
M4	1.0	18	81.0

Fig. 1 Morphologies of composite membranes(a) Surface; (b) Cross section

Table 2 Basic specifications of the membranes

Membrane abbreviation	CA/(°)	Porosity /%	Water uptake/%	MWCO /kDa
M0	68.50±1.64	63.31	31.77	69
M1	63.03±1.70	64.06	32.52	69
M2	60.27±1.90	64.51	32.94	69
M3	55.66±2.60	65.38	33.79	69
M4	53.75±4.70	66.04	34.42	69

Fig. 2 Pure water flux and BSA rejection of membranes

Fig. 3 Concentrations of leaching silver during 12 h filtration of each membrane sample

Fig. 4 Antibacterial effect of membranes on (a) E.coli and (b) P. aeruginosa in the disk diffusion test

Table 3 Antibacterial rate of membranes on E.coli and P. aeruginosa

Membrane abbreviation	PA/%	EC/%
M0	0	0
M1	61	57
M2	100	76
M3	100	100
M4	100	100

Fig. 5 Photodegradation of methyl orange with different membranes under visible light irradiation

Fig. 6 Absorbance variation of methyl orange solution with M4

Fig. 7 Flux values of various membranes at different processes

Fig. 8 Flux recovery ratio (FRR) of membranes before and after visible light irradiation

Fig. 9 Distribution of fouling resistance of all membranes

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Preparation and Property of Polyethersulfone Ultrafiltration Membranes with Mesoporous-graphitic-C₃N₄/Ag

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