Preparation of Hydrophobic PET Track-Etched Membranes for Separation of Oil–Water Emulsion

The paper describes the separation of an oil–water emulsion by filtration using poly(ethylene terephthalate) track-etched membranes (PET TeMs) with regular pore geometry and narrow pore size distribution. PET TeMs were modified with trichloro(octyl)silane to increase their hydrophobic properties. Conditions for the modification of PET TeMs with trichloro(octyl)silane were investigated. The results of changes in the pore diameters and the contact angle depend on the concentration of trichloro(octyl)silane and the soaking time are presented. The obtained samples were characterized by FTIR, AFM, SEM-EDX and gas-permeability test. Chloroform–water and cetane–water emulsions have been used as a test liquid for oil–water separation.

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Self-roughened superhydrophobic coatings for continuous oil–water separation

Journal of Materials Chemistry A ◽

10.1039/c5ta01014d ◽

2015 ◽

Vol 3 (19) ◽

pp. 10248-10253 ◽

Cited By ~ 86

Author(s):

Chao-Hua Xue ◽

Ya-Ru Li ◽

Jin-Lin Hou ◽

Lei Zhang ◽

Jian-Zhong Ma ◽

...

Keyword(s):

Phase Separation ◽

Ethylene Terephthalate ◽

Separation Method ◽

Large Area ◽

Water Separation ◽

Superhydrophobic Coatings ◽

Poly Ethylene Terephthalate ◽

Oil Water Separation ◽

Oil Water ◽

Poly Ethylene

Hydrophobic polydimethylsiloxane based coatings were self-roughened on poly(ethylene terephthalate) textiles via a nonsolvent-induced phase separation method to fabricate superhydrophobic and superoleophilic surfaces. The method is simple and large-area scalable and the obtained textiles could be used as excellent filters for continuous oil–water separation.

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A facile surface modification of a PVDF membrane via CaCO3 mineralization for efficient oil/water emulsion separation

New Journal of Chemistry ◽

10.1039/d0nj03329d ◽

2020 ◽

Vol 44 (48) ◽

pp. 20999-21006

Author(s):

Junda Wu ◽

Atian Xie ◽

Jin Yang ◽

Jiangdong Dai ◽

Chunxiang Li ◽

...

Keyword(s):

Self Assembly ◽

Layer By Layer ◽

Assembly Process ◽

Water Separation ◽

Water Emulsion ◽

Pvdf Membrane ◽

Inorganic Particles ◽

Emulsion Separation ◽

Oil Water Separation ◽

Oil Water

A facile modification of a PVDF membrane using CaCO3 inorganic particles via a layer-by-layer self-assembly process for efficient oil/water separation.

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Oil-in-water emulsion impregnated electrospun poly(ethylene terephthalate) fiber mat as a novel tool for optical fiber cleaning

Journal of Colloid and Interface Science ◽

10.1016/j.jcis.2018.02.035 ◽

2018 ◽

Vol 520 ◽

pp. 64-69 ◽

Cited By ~ 2

Author(s):

Dries J.G. Devlaminck ◽

Md Mahbubor Rahman ◽

Mamoni Dash ◽

Sangram Keshari Samal ◽

Jan Watté ◽

...

Keyword(s):

Optical Fiber ◽

Ethylene Terephthalate ◽

Water Emulsion ◽

Poly Ethylene Terephthalate ◽

Oil In Water ◽

Poly Ethylene ◽

Oil In Water Emulsion

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Application of a triblock copolymer additive modified polyvinylidene fluoride membrane for effective oil/water separation

Royal Society Open Science ◽

10.1098/rsos.171979 ◽

2018 ◽

Vol 5 (5) ◽

pp. 171979 ◽

Cited By ~ 4

Author(s):

S. S. Shen ◽

K. P. Liu ◽

J. J. Yang ◽

Y. Li ◽

R. B. Bai ◽

...

Keyword(s):

Polyvinylidene Fluoride ◽

Triblock Copolymer ◽

Oily Wastewater ◽

The Novel ◽

Permeate Flux ◽

Cleaning Efficiency ◽

Water Separation ◽

Water Emulsion ◽

Oil Water Separation ◽

Oil Water

A hollow fibre membrane was fabricated by blending polyvinylidene fluoride (PVDF) with a triblock copolymer additive polymer that has both hydrophilic and oleophobic surface properties. The novel membrane was characterized and examined for oil/water separation under various system conditions, including different cross-flow rate, feed temperature, trans-membrane pressure, and its rejection and cleaning efficiency, etc. By applying the membrane into the filtration of synthesized oil/water emulsion, the membrane constantly achieved an oil rejection rate of above 99%, with a relatively constant permeate flux varied in the range of 68.9–59.0 l m −2 h −1 . More importantly, the fouling of the used membrane can be easily removed by simple water flushing. The membrane also demonstrated a wide adaptability for different types of real oily wastewater, even at very high feed oil concentration (approx. 115 000 mg l −1 in terms of chemical oxygen demand (COM)). Hence, the novel triblock copolymer additive-modified PVDF membrane can have a great prospect in the continuing effort to expand the engineering application of polymeric membranes for oily wastewater treatment.

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Development of Janus Cellulose Acetate Fiber (CA) Membranes for Highly Efficient Oil–Water Separation

Materials ◽

10.3390/ma14205916 ◽

2021 ◽

Vol 14 (20) ◽

pp. 5916

Author(s):

Xiaotian Yu ◽

Xian Zhang ◽

Yajie Xing ◽

Hongjing Zhang ◽

Wuwei Jiang ◽

...

Keyword(s):

Cellulose Acetate ◽

Water Mixture ◽

Permeate Flux ◽

Fiber Membrane ◽

Water Separation ◽

Water Emulsion ◽

X Ray ◽

Centrifugal Spinning ◽

Oil Water Separation ◽

Oil Water

A new type of Janus cellulose acetate (CA) fiber membrane was used to separate oil–water emulsions, which was prepared with plasma gas phase grafting by polymerizing octamethylcyclotetrasiloxane (D4) onto a CA fiber membrane prepared by centrifugal spinning. The Janus–CA fiber membrane was described in terms of chemical structure using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) analysis, energy dispersive X-ray spectroscopy (EDX) analysis and morphology by field emission scanning electron microscopy (FESEM). In this contribution, we examine the influence of spinning solution concentration, spinning speed and nozzle aperture on the centrifugal spinning process and the fiber morphology. Superhydrophobic/hydrophilic Janus–CA fiber membrane was used to separate water and 1,2-dibromoethane mixture and Toluene-in-water emulsion. Unidirectional water transfer Janus–CA fiber membrane was used to separate n-hexane and water mixture. The separation for the first-time interception rate was about 98.81%, 98.76% and 98.73%, respectively. Experimental results revealed that the Janus cellulose acetate (CA) fiber membrane gave a permeate flux of about 43.32, 331.72 and 275.27 L/(m2·h), respectively. The novel Janus–CA fiber membrane can potentially be used for sustainable W/O emulsion separation. We believe that this is a facile strategy for construction of filtration materials for practical oil–water separation.

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Study on Demulsification-Flocculation Mechanism of Oil-Water Emulsion in Produced Water from Alkali/Surfactant/Polymer Flooding

Polymers ◽

10.3390/polym11030395 ◽

2019 ◽

Vol 11 (3) ◽

pp. 395 ◽

Cited By ~ 9

Author(s):

Bin Huang ◽

Xiaohui Li ◽

Wei Zhang ◽

Cheng Fu ◽

Ying Wang ◽

...

Keyword(s):

Interfacial Tension ◽

Produced Water ◽

Negative Charge ◽

Oil Droplets ◽

Water Separation ◽

Water Emulsion ◽

Flocculation Mechanism ◽

Asp Flooding ◽

Oil Water Separation ◽

Oil Water

The issue of pipeline scaling and oil-water separation caused by treating produced water in Alkali/Surfactant/Polymer (ASP) flooding greatly limits the wide use of ASP flooding technology. Therefore, this study of the demulsification-flocculation mechanism of oil-water emulsion in ASP flooding produced water is of great importance for ASP produced water treatment and its application. In this paper, the demulsification-flocculation mechanism of produced water is studied by simulating the changes in oil-water interfacial tension, Zeta potential and the size of oil droplets of produced water with an added demulsifier or flocculent by laboratory experiments. The results show that the demulsifier molecules can be adsorbed onto the oil droplets and replace the surfactant absorbed on the surface of oil droplets, reducing interfacial tension and weakening interfacial film strength, resulting in decreased stability of the oil droplets. The demulsifier can also neutralize the negative charge on the surface of oil droplets and reduce the electrostatic repulsion between them which will be beneficial for the accumulation of oil droplets. The flocculent after demulsification of oil droplets by charge neutralization, adsorption bridging, and sweeping all functions together. Thus, the oil droplets form aggregates and the synthetic action by the demulsifier and the flocculent causes the oil drop film to break up and oil droplet coalescence occurs to separate oil water.

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Hierarchical rough surfaces formed by LBL self-assembly for oil–water separation

Journal of Materials Chemistry A ◽

10.1039/c4ta01569j ◽

2014 ◽

Vol 2 (30) ◽

pp. 11830-11838 ◽

Cited By ~ 62

Author(s):

Xiaoyu Li ◽

Dan Hu ◽

Kun Huang ◽

Chuanfang Yang

Keyword(s):

Stainless Steel ◽

Removal Efficiency ◽

Self Assembly ◽

Water Separation ◽

Water Emulsion ◽

Oil In Water ◽

Emulsion Separation ◽

Oil Water Separation ◽

Oil Water ◽

Oil In Water Emulsion

Stainless steel felt modified with hierarchically structured coatings and hydrophobicity can achieve a removal efficiency of greater than 99% for oil-in-water emulsion separation.

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An oil/water separation nanofibrous membrane with a 3-D structure from the blending of PES and SPEEK

High Performance Polymers ◽

10.1177/0954008318825297 ◽

2019 ◽

Vol 31 (5) ◽

pp. 538-547 ◽

Cited By ~ 6

Author(s):

Qiong Du ◽

Zheng Chen ◽

Xiangyu Jiang ◽

Jinhui Pang ◽

Zhenhua Jiang ◽

...

Keyword(s):

Mechanical Strength ◽

Separation Process ◽

Nanofibrous Membrane ◽

Water Separation ◽

Water Emulsion ◽

High Mechanical Strength ◽

Good Thermal Stability ◽

Oil In Water ◽

Oil Water Separation ◽

Oil Water

A new nanofibrous membrane (NFM) was prepared by blending polyethersulfone (PES) and sulfonated poly(ether ether ketone) (SPEEK) via electrospinning. The membrane exhibits good thermal stability and high mechanical strength. The hydrophilicity of the membrane could be controlled by adjusting the mass ratio of PES to SPEEK. PES acts as the backbone fiber and provides high mechanical strength, while SPEEK provides hydrophilic functional groups due to the strong hydrophilicity of the sulfonic group. The test results show that the composite NFM integrates the advantages of the two polymers. Simple adjustment of the weight ratios of the two polymers can enable an adjustable flux so that the membrane can be used for different kinds of oil/water separation. The results show that NFMs can not only separate immiscible oil/water systems but also separate oil-in-water emulsions. The immiscible oil/water separation process was driven only by gravity and had a high flux of 1119.63 Lm−2 h−1. This separation process conserves energy, which is beneficial for environmental protection. The separation flux of the oil-in-water emulsion was 758.71 Lm−2 h−1 bar−1 based on measurements under different pressures, and the separation purity total organic carbon was below 50 ppm. This work indicates that a membrane comprised of PES and SPEEK has excellent performance and can be used in different fields.

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