Effects of Casting Solvents on the Morphologies, Properties, and Performance of Polysulfone Supports and the Resultant Graphene Oxide-Embedded Thin-Film Nanocomposite Nanofiltration Membranes

Xie, Quanling; Zhang, Shishen; Hong, Zhuan; Ma, Hanjun; Liu, Chenran; Shao, Wenyao

doi:10.1021/acs.iecr.8b04515

Cited by 18 publications

(11 citation statements)

References 42 publications

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“…The selected solvent and PSU concentration for the optimized supporting layer were NMP and 15.0 wt %, respectively, according to our previous report. 14 The selective layer was formed on the PSU support via the IP method. First, the aqueous phase solutions were prepared by mixing different amounts of GO with 0.05 wt % PVA and 1.0 wt % PIP, which were treated by 15 min of ultrasonication to obtain a uniform and stable aqueous solution.…”

Section: Methodsmentioning

confidence: 99%

Facile Strategy to Construct High-Performance Nanofiltration Membranes by Synergy of Graphene Oxide and Polyvinyl Alcohol

Shen

Xie

Hong

et al. 2020

Ind. Eng. Chem. Res.

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Graphene oxide (GO), as an emerging nanofiller, is commonly incorporated into the polypiperazine amide (PPA) selective layer to enhance nanofiltration (NF) performance. However, GO’s dispersibility and compatibility present outstanding challenges for fabricating high-performance GO-incorporated NF membranes. In this study, polyvinyl alcohol (PVA) and GO were introduced into the aqueous solution at the same time to enhance the membrane performance by taking advantage of the synergetic effects of GO and PVA. GO’s dispersibility in aqueous solution and its compatibility within the PPA matrix were significantly improved because of the introduction of PVA. Furthermore, both PVA and GO contributed to the diffusion behavior of aqueous monomers for constructing defect-free, rougher, thinner, and more hydrophilic NF membranes. With the introduction of 100 ppm GO and 0.05 wt % PVA into the aqueous solution during the interfacial polymerization process, the optimal thin-film nanocomposite NF membrane exhibited a water flux of 84.2 LMH without reducing the salt rejections (97.6% for Na2SO4), which were 69.1 and 36.7% higher than the pristine thin-film composite (TFC)-blank and TFC-PVA membranes, respectively. Meanwhile, an excellent antifouling performance was achieved with a flux recovery rate of 92.1% because of the lower negative charge and excellent hydrophilicity of the membrane surface. This study develops a simple and effective approach to construct high-performance NF membranes.

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Section: Methodsmentioning

confidence: 99%

Facile Strategy to Construct High-Performance Nanofiltration Membranes by Synergy of Graphene Oxide and Polyvinyl Alcohol

Shen

Xie

Hong

et al. 2020

Ind. Eng. Chem. Res.

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“… and HSP of PSf taken from Ref. ). In fact, Echaide‐Górriz et al previously addressed the fouling effect of AO in TFC membranes.…”

Section: Resultsmentioning

confidence: 99%

Nanofiltration thin‐film composite membrane on either the internal or the external surface of a polysulfone hollow fiber

et al. 2020

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The inner and outer surfaces of a porous hollow fiber polysulfone support are compared as substrates for the synthesis of polyamide thin-film composite (TFC) membranes by interfacial polymerization. While both surfaces have pores common of microfiltration membranes, the inner surface has a larger pore diameter than the outer surface (2,700 nm compared to 950 nm). The inner TFC membrane showed higher water nanofiltration permeance than the outer (2.20 ± 0.17 compared to 0.13 ± 0.03 L m −2 hr −1 bar −1 ). This was due to the influence of the porosity and roughness, which were different on both support surfaces. These membranes are interesting because they were synthesized in a hollow fiber support with a high membrane area per volume unit (~6,900 m 2 /m 3 ) and the substrate used was commercial, which means that the TFC membrane obtained is suitable for industrial application. A mathematical simulation of the nanofiltration run with COMSOL Multiphysics 5.3 software confirmed the experimental trends observed. K E Y W O R D S hollow fiber, interfacial polymerization, microfluidics, nanofiltration, thin-film composite

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“…Although WCA of the porous membrane is affected not only by the material hydrophilicity but also by the surface roughness, 47 the surface roughness variations of the modified PVDF membranes were within 10 nm, whose influence on the WCA was very limited. Therefore, it is concluded that this strategy of grafting AGQDs on the membrane surface can significantly improve the PVDF membrane hydrophilicity.…”

Section: Methodsmentioning

confidence: 99%

Antifouling PVDF Membrane by Surface Covalently Anchoring Functionalized Graphene Quantum Dots

Shao

et al. 2020

Ind. Eng. Chem. Res.

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To construct antifouling polyvinylidene fluoride (PVDF) membranes, L-aspartic acid (L-asp)-modified graphene quantum dots (AGQDs) were covalently anchored on the PVDF membrane surface via a three-step modification method. The pristine PVDF membrane was first dehydrofluorinated to generate internal double bonds under the alkali solution. Then diamine (EDA) and two types of hyperbranched polyethyleneimines (HPEI) were grafted on the alkali-treated surfaces through the Michael addition reaction. Finally, the as-synthesized AGQDs were chemically immobilized on the amine-grafted surfaces via an amidation reaction. The surface morphologies and surface properties of the pristine and modified PVDF membranes were comprehensively characterized by X-ray photoelectron spectroscopy, ATR-FTIR, scanning electron microscope, atomic force microscope, and dynamic antifouling experiments. Meanwhile, the grafting efficiency of AGQDs were found to be strongly dependent on the type of amine used. Compared with EDA and HPEI L , HPEI H with a high molecular weight preferred to be grafted on membrane surfaces rather than membrane pores because of its larger steric hindrance, which facilitate the covalent anchorage of AGQDs on the HPEI H -grafted surface. Thanks to the high grafting efficiency of AGQDs, the resulting PVDF-HPEI H -AGQDs membrane possessed the excellent hydrophilicity (water contact angle as low as 58.7°). Most importantly, this membrane demonstrated superior antifouling performance over the pristine PVDF membrane in the presence of either the positively charged foulant (e.g., lysozyme) or the negatively charged foulant (e.g., bovine serum albumin). This novel membrane fabrication approach developed in this study provides a promising solution to covalently anchor hydrophilic nanoparticles on the PVDF membrane surface for antifouling enhancement.

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Effects of Casting Solvents on the Morphologies, Properties, and Performance of Polysulfone Supports and the Resultant Graphene Oxide-Embedded Thin-Film Nanocomposite Nanofiltration Membranes

Cited by 18 publications

References 42 publications

Facile Strategy to Construct High-Performance Nanofiltration Membranes by Synergy of Graphene Oxide and Polyvinyl Alcohol

Facile Strategy to Construct High-Performance Nanofiltration Membranes by Synergy of Graphene Oxide and Polyvinyl Alcohol

Nanofiltration thin‐film composite membrane on either the internal or the external surface of a polysulfone hollow fiber

Antifouling PVDF Membrane by Surface Covalently Anchoring Functionalized Graphene Quantum Dots

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