Efficient construction of a robust PTFE/Al2O3 hydrophobic membrane for effective oil purification

Chen, Xianfu; Dai, Chaowen; Zhang, Tianyu; Xu, Peng; Ke, Wei; Wu, Jian; Qiu, Minghui; Fu, Kaiyun; Fan, Yiqun

doi:10.1016/j.cej.2022.134972

Cited by 26 publications

(12 citation statements)

References 42 publications

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“…With the ever-increasing energy demand globally, the development of oil industry has gained extensive attention. , Investigating oil transport in porous materials remains one of the most important topics since understanding the flow behavior of oil is crucial to a wide range of applications including oil exploitation and purification. − Moreover, oil spill and leakage occur frequently during offshore oil production or marine transportation, leading to great economic losses and significant damage to the marine environment. Recovering oil spill also requires fast oil transport in oil skimmers. , Graphene-based materials have been regarded as promising candidates for efficient oil transport and recovery because of their high porosity and oleophilic/hydrophobic features. − For instance, in our prior work, , graphene petal-based oil skimmers with micro- and nano-channels were fabricated to achieve fast continuous oil recovery from oil-contaminated water.…”

Section: Introductionmentioning

confidence: 99%

Molecular Alignment-Mediated Stick–Slip Poiseuille Flow of Oil in Graphene Nanochannels

Jian

et al. 2023

J. Phys. Chem. B

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The flow behavior of oil in nanochannels has attracted extensive attention for oil transport applications. In most, if not all, of the prior theoretical simulations, oil molecules were observed to flow steadily in nanochannels under pressure gradients. In this study, non-equilibrium molecular dynamics simulations are conducted to simulate the Poiseuille flow of oil with three different hydrocarbon chain lengths in graphene nanochannels. Contrary to the conventional perception of steady flows of oil in nanochannels, we find that oil molecules with the longest hydrocarbon chain (i.e., n-dodecane) exhibit notable stick−slip flow behavior. An alternation between the high average velocity of n-dodecane in the slip motion and the low average velocity in the stick motion is observed, with a drastic, abrupt velocity jolt of up to 40 times occurring at the transition in a stick−slip motion. Further statistical analyses show that the stick−slip flow behavior of n-dodecane molecules originates from the molecular alignment change of oil near the graphene wall. The molecular alignment of n-dodecane shows different statistical distributions under stick and slip motion states, leading to significant changes of friction forces and thus notable velocity fluctuations. This work provides new insights into the Poiseuille flow behavior of oil in graphene nanochannels and may offer useful guidelines for other mass transport applications.

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Section: Introductionmentioning

confidence: 99%

Molecular Alignment-Mediated Stick–Slip Poiseuille Flow of Oil in Graphene Nanochannels

Jian

et al. 2023

J. Phys. Chem. B

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“…Waterproof and breathable fabrics provide comfort and safety to textiles, which can effectively block the penetration of liquids, while quickly expelling evaporated sweat from the body, making them a promising smart textile . Currently, the most widely used WBM on the market are hydrophobic PTFE microporous membranes , and hydrophilic thermoplastic polyurethane (TPU) nonporous membranes. , For hydrophobic waterproof and breathable membranes, the membrane materials are required to have a hydrophobic surface to provide water resistance, , a small interconnected pore structure, and high porosity inside the fibers to provide moisture permeability. , Generally speaking, PTFE waterproof and breathable membranes are widely used in the textile industry, − filtration media, , electronics, , electrical appliances, and healthcare , due to their excellent chemical resistance, low surface energy, strong hydrophobicity, and thermal stability. − At present, the preparation methods of WBM mainly include melting extrusion, biaxial stretching, phase separation, flash evaporation, and electrostatic spinning (ES) methods. , Small pore size, high porosity, a high specific surface area, and customizable surface shape are characteristics of the fibrous membranes created by electrospinning. − While in the configuration of spinning solution of conventional electrospinning, significant amounts of tetrahydrofuran, formic acid, N , N -dimethylformamide (DMF), N , N -dimethylacetamide (DMAc), and other toxic solvents are consumed, , which will not only cause problems with air pollution and water pollution but also obstruct the large-scale production of WBM by electrospinning . The lingering hazardous chemicals can also damage organs and trigger skin allergies. , Therefore, it is crucial to design a green smart solvent WBM that is harmless to the environment. − …”

Section: Introductionmentioning

confidence: 99%

“…1 Waterproof and breathable fabrics provide comfort and safety to textiles, which can effectively block the penetration of liquids, while quickly expelling evaporated sweat from the body, making them a promising smart textile. 2 Currently, the most widely used WBM on the market are hydrophobic PTFE microporous membranes 3,4 and hydrophilic thermoplastic polyurethane (TPU) nonporous membranes. 5,6 For hydrophobic waterproof and breathable membranes, the membrane materials are required to have a hydrophobic surface to provide water resistance, 7,8 a small interconnected pore structure, and high porosity inside the fibers to provide moisture permeability.…”

Section: Introductionmentioning

confidence: 99%

Amphiphobic, Thermostable, and Stretchable PTFE Nanofibrous Membranes with Breathable and Chemical-Resistant Performances for Protective Applications

Liu

et al. 2023

ACS Appl. Polym. Mater.

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Waterproof and breathable membranes (WBM) have diverse applications in outdoor apparel, wearable electronics, and medical hygiene because they can withstand liquid water penetration while simultaneously transmitting water vapor. Nevertheless, developing potential nontoxic WBM based on ecologically friendly solvents remains a significant issue. Therefore, we prepared polytetrafluoroethylene (PTFE) waterproof and permeable membranes (PWBM) with a remarkable moisture transfer rate of 11.9 kg m −2 d −1 , a high hydrostatic pressure of 81.5 kPa, and an astonishing tensile strain of 554%, so the produced PWBM demonstrates great capabilities. Besides, the obtained PWBM also has outstanding chemical resistance and appealing superhydrophobicity. The development of the subsequent generation of environmentally friendly WBM for protective garments may be therefore beneficial to the successful fabrication of such green smart fibrous membranes.

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“…To avoid introducing additional mass transfer resistance, the membrane used in gas-liquid contact membrane systems should provide an effective barrier between the flue gas and the absorbent [15]. Therefore, the surface of the ceramic membrane in this system usually needs to be hydrophobically modified [16][17][18]. The surface contact angle between the liquid and the solid decreases as the temperature increases.…”

Section: Introductionmentioning

confidence: 99%

Carbon Capture from Flue Gas Based on the Combination of Non-Contact Hydrophobic Porous Ceramic Membrane and Bubbling Absorption

Luo¹,

Jin²,

Zhang³

2023

Journal of Renewable Materials

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A hybrid system combined with a non-contact membrane and bubbling absorption is proposed to capture CO 2 from flue gas. The non-contact way of membrane and liquid absorbent effectively avoids the reduction of gas diffusion flux through the membrane. High-porosity ceramic membranes in hybrid systems are used for gas-solid separation in fuel gas treatment. Due to the high content of H 2 O and cement dust in the flue gas of the cement plant, the membrane is hydrophobically modified by polytetrafluoroethylene (PTFE) to improve its anti-water, anti-fouling, and self-cleaning performances. The results show that the diffusion flux of CO 2 through the membrane is still higher than 7.0 × 10 −3 mol/m 2 s (20% CO 2 concentration) even under the influence of water and cement dust. In addition, slaked lime selected as the absorbent is cheap and the product after bubbling absorption is nano-scale light calcium carbonate. To sum up, the hybrid system combining non-contact membrane and bubbling absorption is expected to be used to capture carbon dioxide from the flue gas of the cement plant.

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Efficient construction of a robust PTFE/Al2O3 hydrophobic membrane for effective oil purification

Cited by 26 publications

References 42 publications

Molecular Alignment-Mediated Stick–Slip Poiseuille Flow of Oil in Graphene Nanochannels

Molecular Alignment-Mediated Stick–Slip Poiseuille Flow of Oil in Graphene Nanochannels

Amphiphobic, Thermostable, and Stretchable PTFE Nanofibrous Membranes with Breathable and Chemical-Resistant Performances for Protective Applications

Carbon Capture from Flue Gas Based on the Combination of Non-Contact Hydrophobic Porous Ceramic Membrane and Bubbling Absorption

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