Facile fabrication of omniphobic PVDF composite membrane via a waterborne coating for anti-wetting and anti-fouling membrane distillation

Li, Xipeng; Shan, Huiting; Cao, Min; Li, Bao-An

doi:10.1016/j.memsci.2019.117262

Cited by 88 publications

(34 citation statements)

References 83 publications

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“…LEP is an intrinsic property of the system but lower CA and θ* would be measured using a low density (γ l ) solution. Because both B (due to change in the microstructure between 25 and 50 °C) and γ l decrease with an increase in temperature, , the LEP in actual MD operation is typically lower than that measured at room temperature. − …”

Section: Theoretical Backgroundmentioning

confidence: 99%

A Critical Review of Membrane Wettability in Membrane Distillation from the Perspective of Interfacial Interactions

Chang

Liu

Zhang

et al. 2020

Environ. Sci. Technol.

150

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Hydrophobic membranes used in membrane distillation (MD) systems are often subject to wetting during long-term operation. Thus, it is of great importance to fully understand factors that influence the wettability of hydrophobic membranes and their impact on the overall separation efficiency that can be achieved in MD systems. This Critical Review summarizes both fundamental and applied aspects of membrane wetting with particular emphasis on interfacial interaction between the membrane and solutes in the feed solution. First, the theoretical background of surface wetting, including the relationship between wettability and interfacial interaction, definition and measurement of contact angle, surface tension, surface free energy, adhesion force, and liquid entry pressure, is described. Second, the nature of wettability, membrane wetting mechanisms, influence of membrane properties, feed characteristics and operating conditions on membrane wetting, and evolution of membrane wetting are reviewed in the context of an MD process. Third, specific membrane features that increase resistance to wetting (e.g., superhydrophobic, omniphobic, and Janus membranes) are discussed briefly followed by the comparison of various cleaning approaches to restore membrane hydrophobicity. Finally, challenges with the prevention of membrane wetting are summarized, and future work is proposed to improve the use of MD technology in a variety of applications.

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Section: Theoretical Backgroundmentioning

confidence: 99%

A Critical Review of Membrane Wettability in Membrane Distillation from the Perspective of Interfacial Interactions

Chang

Liu

Zhang

et al. 2020

Environ. Sci. Technol.

150

View full text Add to dashboard Cite

show abstract

“…The results showed the membrane sintered at 380°C presents the highest mechanical strength, with permeate flux of the prepared PTFE hollow fiber membrane about 4.6-8.8 times as that of commercial PTFE follow fiber membranes, and the prepared membrane shows high and stable flux in long-term experiments. Li, Shan, Shan, Cao, and Li (2019) investigated the fouling propensity of PVDF membrane for membrane distillation for coking wastewater. Two omniphobic PVDF composite membranes were prepared by coating SiO 2 on PVDF membrane surface.…”

Section: Annual Literature Reviewmentioning

confidence: 99%

“…Li, Shan, Shan, Cao, and Li (2019) investigated the fouling propensity of PVDF membrane for membrane distillation for coking wastewater. Two omniphobic PVDF composite membranes were prepared by coating SiO 2 on PVDF membrane surface.…”

Section: New Technology Advancesmentioning

confidence: 99%

Membrane processes

Arabi¹,

Pellegrin

Aguinaldo

et al. 2020

Water Environment Research

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This literature review provides a review for publications in 2018 and 2019 and includes information membrane processes findings for municipal and industrial applications. This review is a subsection of the annual Water Environment Federation literature review for Treatment Systems section. The following topics are covered in this literature review: industrial wastewater and membrane. Bioreactor (MBR) configuration, membrane fouling, design, reuse, nutrient removal, operation, anaerobic membrane systems, microconstituents removal, membrane technology advances, and modeling. Other subsections of the Treatment Systems section that might relate to this literature review include the following: Biological Fixed-Film Systems, Activated Sludge, and Other Aerobic Suspended Culture Processes, Anaerobic Processes, and Water Reclamation and Reuse. This publication might also have related information on membrane processes: Industrial Wastes, Hazardous Wastes, and Fate and Effects of Pollutants.

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“…In our previous works, we have developed filtering fabrics [30][31][32][33][34][35], of which polyvinylidene fluoride (PVDF) has proven to be a substrate material with high efficiency, low resistance, and reduced energy consumption [35]. Filters with modified PVDF have advantageous piezoelectric and pyroelectric effects, resulting in a nanoscale filter membrane that can trap fine particles via electrostatic effects, in addition to traditional mechanisms such as diffusion, inertial collision, and interception [36]. This electrostatic force can capture not only charged particles, but also neutral polarised particles, by electrostatic polarisation.…”

Section: Introductionmentioning

confidence: 99%

The Fabrication of Oleophobic Coating and Its Application in Particulates Filtration

et al. 2022

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The stir-frying process in Chinese cooking has produced serious emissions of oily particles, which are an important source of urban air pollution. In particular, the complex composition of fine particulate may pose a threat to human respiratory and immune systems. However, current filtration methods for oily particulate fumes have low filtration efficiency, high resistance, and high equipment costs. In polypropylene (PP) electret filters, efficiency rapidly decreases and pressure drop (wind resistance) sharply increases after the adsorption of oily particles, due to the oleophilic properties of the PP fibre. We addressed this issue of filter performance degradation by fabricating a sodium perfluorooctanoate (SPFO) oleophobic coating on polyvinylidene fluoride (PVDF) fibre membranes for oily particle filtration. The SPFO coating showed a promising oleophobic effect even at low concentrations, which suggests it has oleophobic properties for different oil types and can be modified for different substrates. This fabricated oleophobic coating is thermostable and the oleophobic effect is unaffected by temperatures from 0 to 100 °C. By modifying the SPFO coating on the PVDF membrane, a high filtration efficiency (89.43%) and low wind resistance (69 Pa) was achieved without oil adhesion, so the proposed coating can be applied in the filtration and purification of oily fine particles and offers a potential strategy for preventing atmospheric oil pollution.

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Facile fabrication of omniphobic PVDF composite membrane via a waterborne coating for anti-wetting and anti-fouling membrane distillation

Cited by 88 publications

References 83 publications

A Critical Review of Membrane Wettability in Membrane Distillation from the Perspective of Interfacial Interactions

A Critical Review of Membrane Wettability in Membrane Distillation from the Perspective of Interfacial Interactions

Membrane processes

The Fabrication of Oleophobic Coating and Its Application in Particulates Filtration

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