Superoleophobic surface modification for robust membrane distillation performance

Chew, Nick Guan Pin; Zhao, Shanshan; Malde, Chandresh; Wang, Rong

doi:10.1016/j.memsci.2017.06.089

Cited by 131 publications

(102 citation statements)

References 69 publications

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“…Even though protonated amine-functional groups were also detected on the 6h-mPVDF membrane surface, there were fewer of these groups as compared with the PDA/PEI membrane surface. This was corroborated with the chemical structures of the respective deposited layers [56,191,196]. As such, the electrostatic repulsion between the negatively charged SDS unimers and the negatively charged 6h-mPVDF membrane surface was more dominant than the electrostatic attraction between these unimers and the protonated amine-functional groups.…”

Section: Underwater Oil-membrane Interactionssupporting

confidence: 66%

“…The absorption peak observed at 1701 cm -1 on the mPVDF membranes is indicative of carbonyl/carboxyl groups, suggesting the successful deposition of carboxyl-functional groups during the accelerated oxidative process induced by SP under slightly acidic conditions [191,196]. This in turn rendered the mPVDF membrane surface more hydrophilic than the previously reported PDA/PEI coated membrane [56]. Fig.…”

Section: Characterizations Of Membrane Surface Chemistrymentioning

confidence: 72%

“…Hierarchical re-entrant structures, coupled with low surface energy, can improve the anti-wetting properties of omniphobic membranes as they represent a significant energetic barrier that has to be overcome in order to transit from the metastable Cassie-Baxter state to the fully wetted Wenzel state [50][51][52][53][54]. The other approach to mitigate fouling and wetting involves creating a superhydrophilic skin layer on the top of a hydrophobic or omniphobic substrate [37,[55][56][57]. This forms a hydration layer surrounding the superhydrophilic skin and renders the membrane surface superoleophobic under water.…”

Section: Direct-contact Membrane Distillation Processmentioning

confidence: 99%

“…This fouling was reversible and the permeate flux could be recovered by simply washing with Milli-Q ® water. Besides that, the deposited PDA/PEI layer offered additional protection to the membrane pores and maintained the liquid entry pressure, rendering them less vulnerable to wetting [56]. Last but not least, the excellent fouling-and wetting-resistant properties of the 6h-mPVDF membrane were ascribed to its underwater superoleophobic surface with hierarchical structures and negative charges, which was able to eliminate both the hydrophobic and electrostatic interactions.…”

Section: Underwater Oil-membrane Interactionsmentioning

confidence: 99%

“…Often, the deposition of polydopamine (PDA) through these conventional techniques is non-homogenous, of low thickness, and of limited hydrophilicity. In the previous study as discussed in Chapter 5, the coating process took more than a day to achieve the desired thickness [56]. Even so, the deposited layer presented limited hydrophilicity.…”

Section: Introductionmentioning

confidence: 99%

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Performance enhancement of the membrane distillation process via membrane surface modification for surfactant-containing feed water

Chew¹

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Section: Underwater Oil-membrane Interactionssupporting

confidence: 66%

Section: Characterizations Of Membrane Surface Chemistrymentioning

confidence: 72%

Section: Direct-contact Membrane Distillation Processmentioning

confidence: 99%

Section: Underwater Oil-membrane Interactionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance enhancement of the membrane distillation process via membrane surface modification for surfactant-containing feed water

Chew¹

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Membrane Surface Modification by Electrospinning, Coating, and Plasma for Membrane Distillation Applications: A State‐of‐the‐Art Review

et al. 2021

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Membrane distillation (MD) is a thermally driven separation process where a hydrophobic and microporous membrane separates nonvolatile compounds. Because of its advantages, this process appears as an efficient way to recover water from industrial effluents. However, the commercial membranes used in the MD process still have operational troubles with complex industrial wastewater and against harsh operational conditions. Fouling, wetting, and low time of operation compromise the membrane function and make the total consolidation of MD technology difficult beyond the traditional application (desalination). Membrane modification can be key to mitigating these operational problems, allowing MD's expansion to complex separations. In this context, herein the main technologies to modify the membranes for MD applications of the last five years are comprehensively summarized. Three kinds of postfabrication modifications are focused on: electrospinning, coating, and plasma, including polymeric and ceramic membranes. A critical analysis of each technique is developed, discussing their potentialities and the properties achieved through them. This review enables the understanding of the operational problems of MD technology and leads to finding feasible alternatives to their mitigation. It also clarifies the evolution in membrane modification, discusses the development directions, and points out the future challenges of modifications.

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Beyond Symmetry: Exploring Asymmetric Electrospun Nanofiber Membranes for Liquid Separation

Lu,

Wang,

et al. 2023

Adv Funct Materials

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Composite membranes with asymmetric traits have gained attention in liquid separation, featuring gradient chemical and physical attributes that align or oppose mass transfer direction. Chemically asymmetric configurations harness internal driving forces to heighten separation efficiency, rendering them an appealing option for heightened separation efficiency and fouling prevention. Concurrently, the internal hierarchical structure differences within composite membranes—such as fiber‐based structural adjustments and the gradient density of functional layers—yield the dual benefits of effective liquid repelling and heightened transport efficiency. Unlike conventional phase‐change methods, electrospinning technology possesses advantages in constructing and governing composite fibrous membrane materials with asymmetric chemistry and hierarchical structures, driven by its adaptable stacking methodologies. Notably, the inherent pore structure of electrospun nanofibrous membranes emerges as a proven solution for minimizing transport resistance. In recent times, interest has surged in electrospun nanofibrous membranes endowed with internal asymmetric properties. However, the spotlight has predominantly graced Janus membranes, spotlighting opposite wettability on different sides, leaving other facets of asymmetric membrane enhancement somewhat underexplored. This comprehensive work unveils recent strides in design, fabrication, facilitated transport mechanisms, and real‐world liquid separation applications, all under the aegis of electrospun nanofiber membranes, each endowed with distinct asymmetric properties.

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Superoleophobic surface modification for robust membrane distillation performance

Cited by 131 publications

References 69 publications

Performance enhancement of the membrane distillation process via membrane surface modification for surfactant-containing feed water

Performance enhancement of the membrane distillation process via membrane surface modification for surfactant-containing feed water

Membrane Surface Modification by Electrospinning, Coating, and Plasma for Membrane Distillation Applications: A State‐of‐the‐Art Review

Beyond Symmetry: Exploring Asymmetric Electrospun Nanofiber Membranes for Liquid Separation

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