Superhydrophobic dual layer functionalized titanium dioxide/polyvinylidene fluoride- co -hexafluoropropylene (TiO 2 /PH) nanofibrous membrane for high flux membrane distillation

Shahabadi, Seyed Mahdi Seyed; Rabiee, Hesamoddin; Seyedi, Seyed Mojtaba; Mokhtare, Amir; Brant, Jonathan A.

doi:10.1016/j.memsci.2017.05.039

Cited by 126 publications

(84 citation statements)

References 52 publications

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“…Inspired by the Lotus effect, a superhydrophobic membrane with WCA above 150 o C and lower sliding angle can be fabricated to overcome pore wetting, in which a hieratical structure of the surface created by micro-and nano-structures can enhance surface hydrophobicity by introduction of air pockets between the rough surface and water drop. In general, different techniques can be used to achieve this goal, such as layer-by-layer [20,21] , chemical vapor deposition [22], spray-deposition [3] and electrospray [23]. Among them, electrospray is a simple method due to less steps needed compared with other techniques.…”

Section: Introductionmentioning

confidence: 99%

“…However, the permeate flux suffered a reduction of around 38 % from 13 LMH, when coating the neat membrane with 1.89 µm thickness, using DCMD application in which 70 o C and 20 o C was used as a feed and coolant temperature, respectively. In another study, Shaahbadi and his co-authors [23] investigated an electrospray mixture of TiO2 NPs with poly vinylidene fluoride-co-hexafluoropropene (PH) polymer on a PH electrospun membrane. Their results revealed that the modified membrane used in DCMD with a top electrosprayed layer of 25 µm over 100µm of base membrane had a higher WCA around 162 o and water flux 38 LMH.…”

Section: Introductionmentioning

confidence: 99%

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Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation

et al. 2018

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Membrane pore wetting is the main problem hindering long term stability of permeate flux quality in membrane distillation (MD) applications. A superhydrophobic membrane with micro and nanostructured surface features can offer a unique solution to resolve this issue. Thus, a modified electrospun membrane was fabricated using a combination of electrospinning and electrospraying. The membrane surface hydrophobicity was enhanced by constructing a beaded structure from spraying a mixture of non-fluorinated alumina (Al2O3) nanoparticles (NPs) mixed with low concentration of PVDF polymer on an electrospun base membrane made from PVDF. The results revealed that a rough surface with a hierarchical structure can be constructed, which could not only enhance the membrane hydrophobicity, but also further enhance the permeate efficiency by improving parameters such as flux and rejection. Additionally, the membrane hydrophobicity could be further tuned by controlling the bead spinning volume. Our study shows that the modified membrane with 7.8µm beads layer thickness has boosted the liquid entry pressure (LEP) by 61% from 15.5 psi and the water contact angle to 154 o. The performance of modified membranes with different spraying volume (1-5 ml) along with the neat electrospun and commercial membranes were examined in an air gap membrane distillation (AGMD) application for 5 hours using a 2.5 wt% of synthetic heavy metal solution as a wastewater model. Then, the optimized superhydrophobic membrane with 2 ml spinning volume (ES15-2) was further tested in comparison with the commercial membrane during long-term operations (30 h) using 3.5 wt% of mixed heavy metals. The flux was 18.67 LMH (L m −2 h −1) for modified membrane (ES15-2) compare with 12.62 LMH for commercial PVDF membrane during 30 h of long-term operation with feed and coolant temperature at 60 o C, 20 o C, respectively. The present superhydrophobic membrane fabricated by a combined electrospinning/electrospray method shows high potential for MD applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation

et al. 2018

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“…Size increment following amine grafting was likewise reported by Xin et al . ImageJ (1.51k) software was used to evaluate the particle size distribution of EDA‐TiO 2 nanoparticles after amine functionalization with the help of FESEM images, as reported in the literature . Figure shows the particle size distribution of EDA‐TiO 2 particles.…”

Section: Resultsmentioning

confidence: 55%

Synthesis, characterization, and performance evaluation of PES/EDA‐functionalized TiO₂ mixed matrix membranes for CO₂/CH₄ separation

Mustafa

Mannan

Nasir

et al. 2017

J of Applied Polymer Sci

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Poor adhesion between hydrophobic polymers and hydrophilic inorganic fillers is a challenge that encumbers a high separation performance of mixed matrix membrane (MMM). In this study, Titanium(IV) oxide (TiO2) nanoparticles were functionalized using ethylenediamine (EDA) before embedment in poly(ether sulfone) (PES) polymer matrix. MMMs were synthesized through dry phase inversion technique. Membranes morphology and nanoparticles dispersion was drastically enhanced posterior amine modification indicating an improved adhesion between the polymer and filler particles. Membranes thermal stability was likewise improved as higher degradation temperatures were perceived for PES/EDA–TiO2 MMMs. Gas separation evaluation for pure carbon dioxide (CO2) and methane (CH4) gases revealed a remarkably enhanced separation performance upon amine‐grafting of TiO2 as EDA‐TiO2 MMMs exhibited a higher separation performance as compared to MMMs with pristine TiO2. The highest ideal separation factor achieved was 41.52 with CO2 permeability of 10.11 Barrer at an optimum loading of 5% wt of EDA‐TiO2 which is threefold higher as compared to neat PES membrane and approximately twofold higher than MMMs with pristine TiO2, respectively, at the same filler loading. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45346.

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“…The high contact angle can be obtained by controlling the size of the nanostructures. Low dimensional materials, such as TiO 2 nanowire, TiO 2 , graphene oxide, and Pb nanoparticle have been coating on the surface for creating superhydrophobicity using drop‐coating process, electrospinning, and immersion method . Recently many literatures reported surface treatments for modifying titanium surface to attain water contact angle greater than 160°, as listed in Table .…”

Section: Resultsmentioning

confidence: 99%

Fabrication of superhydrophobic titanium surfaces by anodization and surface mechanical attrition treatment

Tsai

Chen²,

Ou³

et al. 2018

Int J Applied Ceramic Tech

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A superhydrophobic surface of titanium was fabricated by anodization in sodium chloride solution followed by immersion in perfluorodecyltriethoxysilane. The surface characteristics of the anodic film (morphology, composition, microstructure, and adhesion) were investigated by scanning electron microscopy, transmission electron microscopy, X‐ray photoelectron spectroscopy, and scratch testing. The anodic film was comprised of TiO2 and TiCl3 with a thickness of 50 nm. The anodized titanium surface exhibited a hierarchical structure, which consisted of a microscale horn structure with a nanoscale strip‐overlay. This structure provided superhydrophobicity (water contact angle: 151.9° and sliding angle: 3°) following the immersion process. Furthermore, coverage of the hierarchical structure on the anodized titanium surface was improved by performing surface mechanical attrition treatment (SMAT) to grain‐refine titanium surface which was then anodized and it enhanced a slightly increased water contact angle. The thickness (200 nm) of the anodic film on the SMAT‐pretreated titanium surface was much higher than that on the titanium surface (50 nm). This resulted from a large number of grain boundaries on the surface serving as a fast diffusion path during anodization. However, the adhesion of the SMAT‐and‐anodized film was worse than that formed by anodization only. This is due to a large number of pores within the SMAT‐and‐anodized film.

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Superhydrophobic dual layer functionalized titanium dioxide/polyvinylidene fluoride- co -hexafluoropropylene (TiO 2 /PH) nanofibrous membrane for high flux membrane distillation

Cited by 126 publications

References 52 publications

Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation

Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation

Synthesis, characterization, and performance evaluation of PES/EDA‐functionalized TiO₂ mixed matrix membranes for CO₂/CH₄ separation

Fabrication of superhydrophobic titanium surfaces by anodization and surface mechanical attrition treatment

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Superhydrophobic dual layer functionalized titanium dioxide/polyvinylidene fluoride- co -hexafluoropropylene (TiO 2 /PH) nanofibrous membrane for high flux membrane distillation

Cited by 126 publications

References 52 publications

Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation

Robust superhydrophobic electrospun membrane fabricated by combination of electrospinning and electrospraying techniques for air gap membrane distillation

Synthesis, characterization, and performance evaluation of PES/EDA‐functionalized TiO2 mixed matrix membranes for CO2/CH4 separation

Fabrication of superhydrophobic titanium surfaces by anodization and surface mechanical attrition treatment

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Synthesis, characterization, and performance evaluation of PES/EDA‐functionalized TiO₂ mixed matrix membranes for CO₂/CH₄ separation