A facile approach to silica-modified polysulfone microfiltration membranes for oil-in-water emulsion separation

A versatile strategy to fabricate newly-developed silica-modified membranes based on organic/inorganic hybridization for oil/water separation is described in this study. The modified membranes are easily obtained by a simple two-step immersion of polysulfone hollow fiber membranes with radial gradie...

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Bibliographic Details
Published in:RSC advances 2016-01, Vol.6 (47), p.41323-4133
Main Authors: Gao, Qiao-Ling, Fang, Fei, Chen, Chen, Zhu, Xue-Yan, Li, Jing, Tang, Hong-Ying, Zhang, Zhong-Biao, Huang, Xiao-Jun
Format: Article
Language:English
Subjects:
Emulsions
Membranes
Microfiltration
Microstructure
Polysulfone resins
Scanning electron microscopy
Separation
Silicon dioxide
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Summary:A versatile strategy to fabricate newly-developed silica-modified membranes based on organic/inorganic hybridization for oil/water separation is described in this study. The modified membranes are easily obtained by a simple two-step immersion of polysulfone hollow fiber membranes with radial gradient microstructure (RGM-PSF) into a silicon solution of tetraethyl orthosilicate (TEOS) mixed with 3-glycidyloxypropyltrimethoxysilane (GOPTS) and subsequently into a lactic acid solution. Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS) and field emission scanning electron microscopy (FE-SEM) were utilized to characterize the surface compositions and microstructures. A micro/nano-scaled SiO 2 -based coating was generated roughly and continuously on the membrane surfaces, endowing them with superhydrophilicity and underwater superoleophobicity. Results of dead-end filtration experiments demonstrated that the hybridized RGM-PSF membranes could be applied in oil-in-water emulsion separation far more efficiently, with higher water permeate flux, better oil rejection ratio, and higher pressure endurance than those of the common ones. Therefore, this study has provided a facile approach to prepare silica-modified membranes with special wettability, showing prominent application prospects for oily wastewater treatment in practical processes. A facile strategy to prepare silica-modified membranes with superhydrophilicity and underwater superoleophobicity was developed. These hybrid membranes can be applied in oil/water separation with high filtration efficiency and pressure endurance.
ISSN:2046-2069
2046-2069
DOI:10.1039/c6ra07929f