Development of robust and superhydrophobic membranes to mitigate membrane scaling and fouling in membrane distillation

Liao, Yuan; Zheng, Guangtai; Huang‬‬‬‬, Jinhui Jeanne; Tian, Miao; Wang, Rong

doi:10.1016/j.memsci.2020.117962

Cited by 130 publications

(48 citation statements)

References 58 publications

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“…84 It can create a robust superhydrophobic nanobeaded surface by electrospraying a mixed polymer solution with NPs and low-surface-energy materials. Liao et al 85 produced a robust superhydrophobic membrane by electrospraying a PVDF/PDMS/ silica mixture on the surface of PVDF ENMs. The membrane exhibited excellent superhydrophobicity and had a WCA of 170°when the SiO 2 content was 3 wt%.…”

Section: Post-treatment Modification Of Membrane Surfacementioning

confidence: 99%

High‐flux strategy for electrospun nanofibers in membrane distillation to treat aquaculture wastewater: a review

Zhou

Tan

Ahmad

et al. 2021

J of Chemical Tech & Biotech

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Aquaculture wastewater contains a large amount of nitrogen and phosphorus compounds, which has a serious impact on the environment and is also harmful to aquatic life. Such wastewater also contains high salinity, especially for mariculture activities. This review summarizes the recent progress and potential of electrospun nanofiber membranes (ENMs) in membrane distillation (MD) to treat high-salinity aquaculture wastewater. Superhydrophobic membranes, which display a prominent wetting resistance, have been widely used to improve the efficiency of the MD process. The intuitive hypothesis is that a membrane with a low surface energy and a low sliding angle has a higher slip effect, thereby improving the wetting resistance of the membrane. Based on this perspective, this review focuses on the wetting tendency of parahydrophobic ENMs with high water adhesion and membrane design for MD wettability. Various strategies are reviewed, including the techniques to induce surface roughness during membrane fabrication and the post-membrane modification to improve the wetting resistance of MD for long-term operation. This review provides an in-depth analysis and a fundamental interpretation of novel perspectives of ENMs for more advanced MD applications.

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Section: Post-treatment Modification Of Membrane Surfacementioning

confidence: 99%

High‐flux strategy for electrospun nanofibers in membrane distillation to treat aquaculture wastewater: a review

Zhou

Tan

Ahmad

et al. 2021

J of Chemical Tech & Biotech

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“…The reason was that according to the laplace equation, the LEPw is inversely proportional to membrane pore size. 25 An optimum pore size balance is required to balance high permeate flux and good pore anti-wetting. The pore size of the MD membrane is usually between 100 nm and 1 μm.…”

Section: Membrane Morphologymentioning

confidence: 99%

High‐performance desalination of high‐salinity reverse osmosis brine by direct contact membrane distillation using superhydrophobic membranes

Yang

Sun

et al. 2020

J of Applied Polymer Sci

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In this study, the direct contact membrane distillation (DCMD) with a superhydrophobic membrane (SM-DCMD) herein was designed and applied to desalinate RO brine, showing excellent performance in desalinating high salinity. The superhydrophobic membrane with good resistance to pore wetting and fouling was prepared by coating silica nanospheres onto a porous glass fiber substrate and subsequent fluorination. It maintained a stable flux (31.27 LMH at feed temperate of 80 C) and outstanding salt rejection (~100%) even in the presence of natural organic matter (NOM, a typical organic foulant) and sodium dodecyl sulfate (SDS, a typical wetting agent with low surface tension). During handling practical reverse osmosis brine, such SM-DCMD system presented excellent performances in terms of a stable flux of 23.70 LMH and salt rejection efficiency of >99% over 24 h continuous operations. The relevant COD and color removal efficiency kept a constant value of 100%. These overall findings indicate that the SM-DCMD is a hopeful candidate for desalinating practical RO brine with high performance.

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“…The most commonly used membrane-based desalination techniques include reverse osmosis (RO) [ 6 ], electrodialysis (ED) [ 7 ], and, recently, membrane distillation (MD) [ 8 ]. The ideal MD process needs the presence of the following criteria in the used membranes: high water contact angle (high hydrophobicity/non-wettability) [ 9 ], high porosity [ 10 ], small tortuosity factor [ 11 ], narrow and uniform pore size distribution [ 12 ], high liquid entry pressure of water (LEP, the pressure threshold at which liquid water would penetrate into pores to cause pore wetting of membranes) [ 10 ], thin thickness [ 13 ], low thermal conductivity (which would help reduce heat loss by conduction), good thermal and chemical stability [ 14 ], high resistance to fouling [ 15 ], and good mechanical strength [ 13 , 16 , 17 ]. These key factors are closely related to the membrane structure and morphology [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of a Novel Poly(vinylidene fluoride-co-hexafluoropropylene)/Poly(ethersulfone) Blend Membrane Fabricated Using an Innovative Method of Mixing Electrospinning and Phase Inversion

2021

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In this work, a novel polymeric membrane was innovated in terms of composition and preparation techniques. A blend of poly(vinylidene fluoride-co-hexafluoropropylene) (PcH) and poly(ethersulfone) (PES) (18 wt.% total polymer concentration) was prepared using a N-methylpyrrolidone (NMP) and N, N-Dimethylformamide (DMF) solvents mixture, while Lithium chloride (0.05–0.5 wt%) was used as an additive. The electrospinning and phase inversion techniques were used together to obtain a novel membrane structure. The prepared membranes were characterized using scanning electron microscope imaging, energy dispersive X-Ray, differential scanning calorimeter, thermogravimetric analysis, and Fourier transfer infrared spectroscopy-attenuated total reflectance analyses. Moreover, the static water contact angle, membrane thickness, porosity, surface roughness as well as water vapor permeability were determined. ImageJ software was used to estimate the average fiber diameter. Additionally, the effect of the change of PcH concentration and coagulation bath temperature on the properties of the fabricated membrane was studied. The novel developed membrane has shown a good efficiency in terms of properties and features, as a membrane suitable for membrane distillation (MD); a high porosity (84.4% ± 0.6), hydrophobic surface (136.39° ± 3.1 static water contact angle), and a water vapor permeability of around 4.37 × 10−5 g·m/m2·day·Pa were obtained. The prepared membrane can be compared to the MD membranes commercially available in terms of properties and economic value.

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Development of robust and superhydrophobic membranes to mitigate membrane scaling and fouling in membrane distillation

Cited by 130 publications

References 58 publications

High‐flux strategy for electrospun nanofibers in membrane distillation to treat aquaculture wastewater: a review

High‐flux strategy for electrospun nanofibers in membrane distillation to treat aquaculture wastewater: a review

High‐performance desalination of high‐salinity reverse osmosis brine by direct contact membrane distillation using superhydrophobic membranes

Preparation and Characterization of a Novel Poly(vinylidene fluoride-co-hexafluoropropylene)/Poly(ethersulfone) Blend Membrane Fabricated Using an Innovative Method of Mixing Electrospinning and Phase Inversion

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