Preparation and Desalination Performance of Composite Reverse Osmosis Membrane Based on Electrospinning Technology†

doi:10.7503/cjcu20150519

Abstract

Abstract:

Electrospun polyethylene terephthalate(PET) nanofibrous membranes were prepared on the non-woven cloth, then crosslinked chitosan was coated on the composite membrane to modify it. Finally interfacial polymerization was conducted using m-phenylene diamine(MPD) and 1,3,5-benzenetricarbonyl trichloride(TMC) benzene as monomers on chitosan modified nanofibrous to prepare polyamide separation layer. A new type of nanofibrous composite reverse osmosis membrane was obtained. This composite reverse osmosis membrane has typical ridge and valley structure of the typical commercial polyamide composite reverse osmosis membrane. Sodium dodecyl benzene sulfonate(SDBS) content on the properties and structure of the membrane was systematically studied from three aspects, means the film surface morphology, hydrophilicity and separation properties. The results showed that the content of SDBS had a certain effect on the uniformity and hydrophilicity of the membrane morphology. In addition, with the increase of SDBS content, membrane desalination first increases then decreases, and the flux had a small amplitude increase,then it decrease after the increase.

Key words: Composite reverse osmosis membrane, Electrospun, interfacial polymerization, Sodium dodecyl benzene sulfonate(SDBS), Desalination performance

CLC Number:

TrendMD:

WANG Jiaona, YIN Zefang, LI Congju. Preparation and Desalination Performance of Composite Reverse Osmosis Membrane Based on Electrospinning Technology^†[J]. Chem. J. Chinese Universities, 2016, 37(2): 396.

Figures/Tables 10

Fig.1 Interfacial polymerization device

Scheme 1 Polymerization of MPD and TMC

Fig.2 Lab-scale cross-flow filtration rig used for the performance test of the obtained membranes

Fig.3 SEM images of untreated(A) and hot-pressed(B) electrospun PET nanofibrous membrane

Fig.4 Fiber diameter distribution of PET membrane

Fig.5 SEM images of the prepared composite reverse osmosis(RO) membranes with different SDBS concentrations Mass fraction of SDBS(%): (A) 0; (B) 0.05; (C) 0.10; (D) 0.15; (E) 0.20; (F) 0.25.

Fig.6 Cross-section images of the prepared composite RO membranes with different SDBS concentrations Mass fraction of SDBS(%): (A) 0; (B) 0.05; (C) 0.10; (D) 0.15; (E) 0.20; (F) 0.25.

Fig.7 Contact angles of the obtained membranes with different SDBS content

Fig.8 Separation properties in terms of permeabi-lity and NaCl rejection for the prepared composite RO membranes with different SDBS content

Fig.9 SEM images of the prepared composite RO membranes after filtering with different SDBS content Mass fraction of SDBS(%): (A) 0; (B) 0.05; (C) 0.10; (D) 0.15; (E) 0.20; (F) 0.25.

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