A facile approach to enhance performance of PVDF-matrix nanocomposite membrane via manipulating migration behavior of graphene oxide

Ma, Hanjun; Xie, Quanling; Wu, Chenpu; Shen, Lufang; Hong, Zhuan; Zhang, Guoliang; Lu, Yinghua; Shao, Wenyao

doi:10.1016/j.memsci.2019.117268

Cited by 26 publications

(13 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Poly(vinylidene fluoride) (PVDF) has played a significant role owing to its excellent chemical resistance, mechanical strength, and thermal stability. , PVDF membranes are susceptible to contamination, and PVDF casting solution is difficult to defoam. These two issues affect the broad application prospects of the PVDF material.…”

Section: Introductionmentioning

confidence: 99%

Novel PVDF-g-NMA Copolymer for Fabricating the Hydrophilic Ultrafiltration Membrane with Good Antifouling Property

Tong

Huang

Zuo

et al. 2020

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Improving the hydrophilicity of the poly(vinylidene fluoride) (PVDF) ultrafiltration membrane can change its adsorption fouling characteristics. Here, a novel amphiphilic material of PVDF grafted with N-methylolacrylamide (PVDF-g-NMA) was developed via photoinduced Cu(II)-mediated reversible deactivation radical polymerization (RDRP). The PVDF-g-NMA ultrafiltration membrane was prepared by the nonsolventinduced phase-separation method. The PVDF-g-NMA copolymer was characterized by 1 H NMR and Fourier transform infrared spectroscopy. The performance of the PVDF-g-NMA membrane was evaluated by determining the permeation flux, contact angle, roughness, and antifouling tests. The roughness data show that a low content of N-methylolacrylamide can effectively reduce the surface roughness of membranes by 50%, resulting in greater antifouling ability. The prepared ultrafiltration membrane containing 15 wt % PVDF-g-NMA exhibited the best hydrophilicity with an average pure water flux of up to 272.1 L•m −2 •h −1 , higher than that of the pure PVDF membrane (45.4 L•m −2 •h −1 ). The contact angle of the PVDF-g-NMA ultrafiltration membrane decreased from 85.5 to 67.4°. The bovine serum albumin rejection rate of the PVDF-g-NMA membrane significantly increased from 85.7 to 92.6%, and the pure water flux recovery rate increased from 79.0 to 88.5%. The PVDF-g-NMA ultrafiltration membrane had excellent hydrophilicity and antifouling properties, which would be promising for wastewater treatment.

show abstract

Section: Introductionmentioning

confidence: 99%

Novel PVDF-g-NMA Copolymer for Fabricating the Hydrophilic Ultrafiltration Membrane with Good Antifouling Property

Tong

Huang

Zuo

et al. 2020

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Moreover, XPS was used to further analyze the chemical composition of AGQDs. As shown in Figure B, the peaks located in 284.5, 285.0, and 288.0 eV were assigned to the characteristic C–C/CC, −CH 2 ,– and O–CO chemical groups of AGQDs, respectively. , More importantly, the peak at 286.1 eV assigned to C–O/C–N was also observed, indicating that L-asp was covalently linked to AGQDs. The above results suggest that the AGQDs were successfully synthesized using L-asp and citric acid via the one-step pyrolysis method.…”

Section: Results and Discussionmentioning

confidence: 90%

“…All of the membranes displayed the binding energies at 289.3, 283.6, and 284.7 eV, which were assigned to C−F, C−H, and CH 2 / C−C from PVDF, respectively. 21 Furthermore, the binding energy at 286.4 eV assigned to C−OH also existed in the PVDF-B and PVDF-AT membranes, which suggested that a small amount of PEG remained in the final PVDF membrane matrix. The PVDF-AT membrane showed a sharper peak at 284.7 eV because of the dehydrofluorination reaction of PVDF-generated CC groups during the alkali treatment process.…”

Section: Methodsmentioning

confidence: 99%

“…In recent years, graphene oxide (GO) as a novel two-dimensional carbon nanomaterial has received considerable attractions for membrane modifications because of their abundant oxygen-containing functional groups, large specific surface area, and the unique laminar nanostructures. Up to now, most related studies focus on embedding GO or its derivatives into PVDF mixed matrix membranes through physical blending − rather than chemical grafting, which is largely because of the large size, the low reactivity, and the aggregation issue of GO nanosheets.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Antifouling PVDF Membrane by Surface Covalently Anchoring Functionalized Graphene Quantum Dots

Shao

et al. 2020

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…Besides the aforementioned features, the most noticeable difference with other reported membranes lies in the antifouling ability during nanofiltration. Because of the introduction of hydrophilic Mn 2 O 3 nanocrystals, the hydrophilicity of prepared Mn/N-rGO nanofilms was obviously enhanced ( Figure S9 ), endowing the membrane with improved fouling-resistant ability ( Sun et al., 2019 ; Ma et al., 2019 ). The as-synthesized Mn/N-rGO nanofilms exhibited high fouling resistance with negligible flux decay for at least 100 h.…”

Section: Resultsmentioning

confidence: 99%

Confined assembly of ultrathin nanoporous nitrogen-doped graphene nanofilms with dual metal coordination chemistry

Zhang

et al. 2021

iScience

Self Cite

View full text Add to dashboard Cite

Summary Graphene oxide (GO) nanosheets with unique structure have received much attention in providing opportunity for high-performance membranes in separation. However, the rational design of ultrathin graphene membranes with controlled structures remains a big challenge. Here, we report a methodology to synthesize dual metal-coordinated ultrathin nanoporous graphene nanofilms by tailoring well-aligned nanocrystals as building blocks on heteroatom-doped GO nanosheets with tunable architectures. Manipulation of metal nitrate as bifunctional dopants realizes N-doping of graphene oxide and preferential growth of α-Mn 2 O 3 nanocrystals. Generation of Mn-O-C bond during cross-linking greatly strengthens the stability of membranes for long-term steady operation. Meanwhile, because of spatial confinement effects and high binding energy, N-doped reduced GO nanosheets are desirable supports to construct numerous Mn-N-C bonds, thus generating artificial nanopores to significantly increase nanochannels for ultrafast mass transport. Moreover, the size-selective permeability of ultrathin nanoporous GO-based nanofilms can be optimized by managing the types of metal source for target coordination.

show abstract

A facile approach to enhance performance of PVDF-matrix nanocomposite membrane via manipulating migration behavior of graphene oxide

Cited by 26 publications

References 48 publications

Novel PVDF-g-NMA Copolymer for Fabricating the Hydrophilic Ultrafiltration Membrane with Good Antifouling Property

Novel PVDF-g-NMA Copolymer for Fabricating the Hydrophilic Ultrafiltration Membrane with Good Antifouling Property

Antifouling PVDF Membrane by Surface Covalently Anchoring Functionalized Graphene Quantum Dots

Confined assembly of ultrathin nanoporous nitrogen-doped graphene nanofilms with dual metal coordination chemistry

Contact Info

Product

Resources

About