Flux-enhanced PVDF mixed matrix membranes incorporating APTS-functionalized graphene oxide for membrane distillation

Mixed matrix membrane (MMM) structures and performances are greatly affected by the distribution of nanoparticles in the polymeric matrix. Until now, there has been little research on the effects of nanoparticle distribution states on polyacrylonitrile (PAN)‐based MMM structures and performances. In this paper, different intermolecular interactions between nanoparticles and PAN molecules were generated by in situ fabricated amino‐functionalized SiO2 and TiO2 nanoparticles to create absolutely different distribution states of nanoparticles in a PAN matrix. The results indicated that, due to the strong interactions between amino and cyano groups, SiO2 is distributed in the PAN membranes homogeneously, while most of the TiO2 migrates to the membrane's top surfaces or the walls of pores or even escape from the membranes during the nonsolvent index phase separation (NIPS) process. PAN‐TiO2 MMMs have more hydrophilic top surfaces, higher porosity, larger mean pore size, and stronger antifouling performances than pure PAN and PAN‐SiO2 membranes. The PAN‐TiO2 MMMs have an ultrahigh water flux of 1204.6 L/(m2 h), which is more than 44 times that of PAN membranes. And the good pore structures and hydrophilicity of the membranes derived from special interactions between in situ TiO2 nanoparticles and PAN molecules can give high‐performance PAN‐based ultrafiltration membranes a bright future. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47902.

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“…Three cycled antifouling tests were operated, and the parameters of the antifouling performances can be calculated using eqs. :

FRR = \frac{J_{2}}{J_{0}}

R_{r} = \frac{J_{2} - J_{1}}{J_{0}}

R_{ir} = \frac{J_{0} - J_{2}}{J_{0}}

R_{t} = R_{r} + R_{ir} = \frac{J_{0} - J_{1}}{J_{0}}

…”

Section: Methodsmentioning

confidence: 99%

Inorganic nanoparticles incorporated in polyacrylonitrile‐based mixed matrix membranes for hydrophilic, ultrafast, and fouling‐resistant ultrafiltration

Liu

Pan

et al. 2019

J of Applied Polymer Sci

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“…SWCNTs have better properties than MWCNTs, but difficult dispersion is a noticeable issue. In addition to the known eminent hydrophobicity of the CNTs, the inclusion of CNTs increases the membrane surface roughness, which enhances the membrane surface hydrophobicity, a critical property for many MD applications [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Triple-Layer Nanocomposite Membrane Prepared by Electrospinning Based on Modified PES with Carbon Nanotubes for Membrane Distillation Applications

et al. 2020

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In this work, a novel triple-layer nanocomposite membrane prepared with polyethersulfone (PES)/carbon nanotubes (CNTs) as the primary bulk material and poly (vinylidene fluoride-co-hexafluoro propylene) (PcH)/CNTs as the outer and inner surfaces of the membrane by using electrospinning method is introduced. Modified PES with CNTs was chosen as the bulk material of the triple-layer membrane to obtain a high porosity membrane. Both the upper and lower surfaces of the triple-layer membrane were coated with PcH/CNTs using electrospinning to get a triple-layer membrane with high total porosity and noticeable surface hydrophobicity. Combining both characteristics, next to an acceptable bulk hydrophobicity, resulted in a compelling membrane for membrane distillation (MD) applications. The prepared membrane was utilized in a direct contact MD system, and its performance was evaluated in different salt solution concentrations, feed velocities and feed solution temperatures. The results of the prepared membrane in this study were compared to those reported in previously published papers. Based on the evaluated membrane performance, the triple-layer nanocomposite membrane can be considered as a potential alternative with reasonable cost, relative to other MD membranes.

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“…[158,159] During the phase inversion of GFM-polymer systems, the polymer chains solidify rapidly with limited rearrangement capacity, resulting in membranes having a high surface pore density and size, as well as overall porosity. [158,160] Given their high hydrophilicity (and topological similarity to GFMs), we expect MXenes to exhibit high capacity to prepare highly permeable membranes with a wide range of polymers. Importantly, upon phase separation, MXenes will naturally be exposed to the membrane surface, which might be an interesting way to develop antibiofouling membranes.…”

Section: Phase Inversionmentioning

confidence: 99%

MXene Materials for Designing Advanced Separation Membranes

et al. 2020

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MXenes are emerging rapidly as a new family of multifunctional nanomaterials with prospective applications rivaling that of graphenes. Herein, a timely account of the design and performance evaluation of MXene‐based membranes is provided. First, the preparation and physicochemical characteristics of MXenes are outlined, with a focus on exfoliation, dispersion stability, and processability, which are crucial factors for membrane fabrication. Then, different formats of MXene‐based membranes in the literature are introduced, comprising pristine or intercalated nanolaminates and polymer‐based nanocomposites. Next, the major membrane processes so far pursued by MXenes are evaluated, covering gas separation, wastewater treatment, desalination, and organic solvent purification. The potential utility of MXenes in phase inversion and interfacial polymerization, as well as layer‐by‐layer assembly for the preparation of nanocomposite membranes, is also critically discussed. Looking forward, exploiting the high electrical conductivity and catalytic activity of certain MXenes is put into perspective for niche applications that are not easily achievable by other nanomaterials. Furthermore, the benefits of simulation/modeling approaches for designing MXene‐based membranes are exemplified. Overall, critical insights are provided for materials science and membrane communities to navigate better while exploring the potential of MXenes for developing advanced separation membranes.

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Flux-enhanced PVDF mixed matrix membranes incorporating APTS-functionalized graphene oxide for membrane distillation

Cited by 156 publications

References 72 publications

Inorganic nanoparticles incorporated in polyacrylonitrile‐based mixed matrix membranes for hydrophilic, ultrafast, and fouling‐resistant ultrafiltration

Inorganic nanoparticles incorporated in polyacrylonitrile‐based mixed matrix membranes for hydrophilic, ultrafast, and fouling‐resistant ultrafiltration

Triple-Layer Nanocomposite Membrane Prepared by Electrospinning Based on Modified PES with Carbon Nanotubes for Membrane Distillation Applications

MXene Materials for Designing Advanced Separation Membranes

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