High-performance oil-water separation polytetrafluoroethylene membranes prepared by picosecond laser direct ablation and drilling

Qin, Zhongli; Xiang, Huiqin; Liu, Jianguo; Zeng, Xiaoyan

doi:10.1016/j.matdes.2019.108200

Cited by 29 publications

(12 citation statements)

References 32 publications

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“…The preferential capillary force of CNTs for kerosene and inherent hydrophobicity of CNTs ensured higher water rejection [11,[19][20][21][22][23]. However, when the applied pressure was very high, it exceeded the capillary pressure, and water could pass through the membranes [12,[25][26][27][28]. As a result, at higher ∆P, the water flux increased faster than kerosene flux resulting in a decrease in water rejection.…”

Section: Effect Of Transmembrane Pressurementioning

confidence: 99%

Carbon Nanotube Enhanced Filtration and Dewatering of Kerosene

et al. 2022

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Current approaches to dewatering aviation fuel such as kerosene are adsorption by activated charcoal, gravity separation, etc. The objective of this work is to develop and demonstrate the filtration and dewatering of kerosene using a carbon nanotube immobilised membrane (CNIM). Highly hydrophobic membranes were prepared by immobilising carbon nanotube (CNTs) over polytetrafluoroethylene (PTFE) and polyvinylidene difluoride (PVDF) microfiltration membrane for the dewatering of ppm level water from kerosene. The effects of different CNT concentrations on membrane morphology, hydrophobicity, porosity, and permeability were characterised. After immobilising CNT into membranes, the contact angle increased by 9%, 16%, and 43% compared to unmodified 0.1 μm PTFE, 0.22 μm PTFE and 0.22 μm PVDF membranes, respectively. The CNIM showed remarkable separation efficiency for the fuel-water system. The micro/nano water droplets coalesced on the CNT surface to form larger diameters of water droplets detached from the membrane surface, leading to enhanced water rejection. In general, the water rejection increased with the amount of CNT immobilised while the effective surface porosity over pore length and flux decreased. PTFE base membrane showed better performance compared to the PVDF substrate. The CNIMs were fabricated with 0.1 and 0.22 μm PTFE at an optimised CNT loading of 3 and 6 wt.%, and the water rejection was 99.97% and 97.27%, respectively, while the kerosene fluxes were 43.22 kg/m2·h and 55.44 kg/m2·h respectively.

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Section: Effect Of Transmembrane Pressurementioning

confidence: 99%

Carbon Nanotube Enhanced Filtration and Dewatering of Kerosene

et al. 2022

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“…Here, the generation of holes by laser drilling is a widely used method. An example is a polymer membrane with through-holes leading to a special wettability showing improved oil-water separation [ 25 ]. Furthermore, a membrane with specially designed holes has shown the possibility of unidirectional gas transport [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Geometry assessment of ultra-short pulsed laser drilled micro-holes

Putzer

Ackerl

Wegener

2020

Int J Adv Manuf Technol

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Ultra-short pulsed laser ablation enables a defined generation of micro-holes. A parameter study on the ablation characteristics of copper clearly reveals a benefit for green wavelength with lower threshold fluence, simultaneously increasing the Rayleigh length. The use of a circular drilling method allows a defined manufacturing of micro boreholes and micro through-holes with 35 μm diameter of up to 165 μm and 300 μm length. Introducing high-resolution micro-computed X-ray tomography studying the micro-hole evolution and adjacent geometrical transformations reveals micrometer resolution and high usability. The conical geometry evolving up to an aspect ratio of 5:1 fits well to established models known for percussion drilling. However, increasing the number of pulses leads to non-conical geometry evolution, and this resulting geometry is studied for the first time. Henceforth, the exact geometrical evolution from conical to cylindrical shape upon laser drilling can be resolved revealing the impact of multiple reflections at the generated steep flanks.

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“…Multifunctional superhydrophobic materials have aroused widespread concern in academia and industry because of their wide application value, such as such as self-cleaning, − fluid drag reduction, − anticorrosion, , antifrosting, − antibacteria, and oil/water separation, − as well as making energy devices . However, with the continuous advancement of industrialization and the oil pollution discharge and leakage accidents emerging frequently in recent years, the development of new functional materials for oil/water separation has become a focus of research and development .…”

Section: Introductionmentioning

confidence: 99%

One-Step Preparation of Robust Superhydrophobic Foam for Oil/Water Separation by Pulse Electrodeposition

et al. 2021

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Frequent leakage and pollution of oily wastewater seriously affect the world's ecosystem safety and economic development, which prompts us to urgently develop a highly effective, low-cost, wearresistant, chemically stable, and environmentally friendly new functional material for oil/water separation. In this paper, a robust superhydrophobic material was successfully electrodeposited on the porous copper foam substrates in myristic acid (CH 3 (CH 2 ) 12 COOH) and lanthanum chloride (LaCl 3 •6H 2 O) electrodeposition solution under a continuous pumping circulation and rotation condition. Moreover, SEM, EDS, XRD, FTIR, and XPS technologies were utilized to characterize the surface morphology and chemical composition information. The superhydrophobic property was evaluated by optical contact angle instrument and high-speed camera. It turned out that the micro/nanostructures were mainly composed of lanthanum myristate, and static CA of superhydrophobic copper foam (SCF) was up to 165.2°with SA ≈ 2°. Besides, the SCF exhibited a better performance with good anticorrosion, excellent chemical stability, and outstanding mechanical stability. Furthermore, the SCF can achieve up to 98.6% oil/water separation efficiency. More importantly, by employing this novel processing method, it can effectively save time and provide a promising potential way to make denser and thicker foams for continuous oil/water separation and may be easily applied to other conductive metal matrix materials.

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High-performance oil-water separation polytetrafluoroethylene membranes prepared by picosecond laser direct ablation and drilling

Cited by 29 publications

References 32 publications

Carbon Nanotube Enhanced Filtration and Dewatering of Kerosene

Carbon Nanotube Enhanced Filtration and Dewatering of Kerosene

Geometry assessment of ultra-short pulsed laser drilled micro-holes

One-Step Preparation of Robust Superhydrophobic Foam for Oil/Water Separation by Pulse Electrodeposition

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