A novel composite membrane for simultaneous separation and catalytic degradation of oil/water emulsion with high performance

The use of poly(vinylidene fluoride) (PVDF) microfiltration (MF) membranes to purify oily water has received much attention. However, it is challenging to obtain high-performance PVDF microfiltration membranes due to severe surface fouling and rapid decline of permeability. This study explored a new approach to fabricate high-performance PVDF/silica (SiO2) composite membrane via the use of a polymer solution featuring lower critical solution temperature (LCST) characteristics and the non-solvent thermally induced phase separation method (NTIPS). Coupling with morphological observations, the membrane formation kinetics were analyzed in depth to understand the synergistic effect between the LCST solution properties and fabrication conditions in NTIPS. Utilizing such a synergistic effect, the transition from finger-like macrovoid pores to bi-continuous highly connected pores could be flexibly tuned by increasing the PVDF concentration and the weight ratio of SiO2/PVDF in the dope solution and by raising the coagulation temperature to above the LCST of the solution. The filtration experiments with surfactant-stabilized oil-water emulsion showed that the permeation flux of the PVDF/SiO2 composite membranes was higher than 318 L·m−2·h−1·bar−1 and the rejection above 99.2%. It was also shown that the PVDF/SiO2 composite membranes, especially those fabricated above the LCST, demonstrated better hydrophilicity, which resulted in significant enhancement in the anti-fouling properties for oil/water emulsion separation. Compared to the benchmark pure PVDF membrane in oily water purification, the optimal composite membrane T70 was demonstrated via the 3-cycle filtration experiments with a significantly improved flux recovery ratio (Frr) and minimal reduced irreversible fouling (Rir). Overall, with the developed method in this work, facile procedure to tune the membrane morphology and pore structure was demonstrated, resulting in high performance composite membranes suitable for oil/water emulsion separation.

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Manufacture of a Hydrophobic Silica Nanoparticle Composite Membrane for Oil-Water Emulsion Separation

International Journal of Technology ◽

10.14716/ijtech.v11i2.3279 ◽

2020 ◽

Vol 11 (2) ◽

pp. 364

Author(s):

Bambang Poerwadi ◽

Christina W. Kartikowati ◽

Rama Oktavian ◽

Oyong Novareza

Keyword(s):

Composite Membrane ◽

Silica Nanoparticle ◽

Water Emulsion ◽

Hydrophobic Silica ◽

Emulsion Separation ◽

Oil Water

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Nanofibrous metal–organic framework composite membrane for selective efficient oil/water emulsion separation

Journal of Membrane Science ◽

10.1016/j.memsci.2017.08.047 ◽

2017 ◽

Vol 543 ◽

pp. 10-17 ◽

Cited By ~ 62

Author(s):

Yahui Cai ◽

Dongyun Chen ◽

Najun Li ◽

Qingfeng Xu ◽

Hua Li ◽

...

Keyword(s):

Composite Membrane ◽

Metal Organic Framework ◽

Water Emulsion ◽

Emulsion Separation ◽

Metal Organic ◽

Oil Water ◽

Organic Framework

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One-pot Synthesis of Multifunctional KGM/PDA/PVDF Composite Membrane for Efficient Treatment of Oil–water Emulsion and Dye

NANO ◽

10.1142/s1793292021500259 ◽

2021 ◽

pp. 2150025

Author(s):

Yilin Wu ◽

Yan Yan ◽

Jian Lu ◽

Zhixin Yu ◽

Junda Wu ◽

...

Keyword(s):

Corrosion Resistance ◽

Composite Membrane ◽

Separation Efficiency ◽

Inversion Method ◽

One Pot ◽

Water Separation ◽

Covalent Bonds ◽

Water Emulsion ◽

Efficient Treatment ◽

Oil Water

A new multifunctional KGM/PDA/PVDF composite membrane was successfully prepared via facile nonsolvent induced phase inversion method. Here, the KGM component consisted of numerous covalent bonds, which could improve the corrosion resistance of membrane materials. The dopamine, as a natural “glue” between PVDF substantial and KGM, is capable of integrating different materials together suitably. The as-prepared membrane possessed superior superhydrophilic/underwater superoleophobic property, great corrosion resistance and antifouling property. The separation efficiency was as high as 99.01%, and could stay relatively stable even in the acid, alkali or high salty environment. Additionally, the membrane had great regeneration performance and could keep stable after 15 cyclic separation, which was appropriate for efficient various oil–water separation process. Moreover, the composite membrane could also effectively separate dyes in different environments and the efficiencies were all more than 91%. All in all, the multifunctional composite membrane with facile preparation method might provide a promising strategy and significant theoretical basis for the efficient separation of oil–water emulsions and dyes.

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