The roles of oxygen-containing functional groups in modulating water purification performance of graphene oxide-based membrane

Yu, Hao; He, Yi; Xiao, Guoqing; Ma, Jing; Gao, Yixuan; Hou, Ruitong; Yin, Xiangying; Wang, Yuqi; Xue, Mei

doi:10.1016/j.cej.2020.124375

Cited by 102 publications

(26 citation statements)

References 46 publications

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“…Kamedulski et al described an effective method for obtaining N-doped graphene using gamma radiation [ 31 ]. Yu et al demonstrate the role of oxygen containing functional groups in performing water purification for graphene-oxide-based membranes [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Estimation of Number of Graphene Layers Using Different Methods: A Focused Review

et al. 2021

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Graphene, a two-dimensional nanosheet, is composed of carbon species (sp2 hybridized carbon atoms) and is the center of attention for researchers due to its extraordinary physicochemical (e.g., optical transparency, electrical, thermal conductivity, and mechanical) properties. Graphene can be synthesized using top-down or bottom-up approaches and is used in the electronics and medical (e.g., drug delivery, tissue engineering, biosensors) fields as well as in photovoltaic systems. However, the mass production of graphene and the means of transferring monolayer graphene for commercial purposes are still under investigation. When graphene layers are stacked as flakes, they have substantial impacts on the properties of graphene-based materials, and the layering of graphene obtained using different approaches varies. The determination of number of graphene layers is very important since the properties exhibited by monolayer graphene decrease as the number of graphene layer per flake increases to 5 as few-layer graphene, 10 as multilayer graphene, and more than 10 layers, when it behaves like bulk graphite. Thus, this review summarizes graphene developments and production. In addition, the efficacies of determining the number of graphene layers using various characterization methods (e.g., transmission electron microscopy (TEM), atomic force microscopy (AFM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectra and mapping, and spin hall effect-based methods) are compared. Among these methods, TEM and Raman spectra were found to be most promising to determine number of graphene layers and their stacking order.

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Section: Introductionmentioning

confidence: 99%

Estimation of Number of Graphene Layers Using Different Methods: A Focused Review

et al. 2021

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“…N-doped graphene has a potential in electrochemical applications, particularly the development of anode or cathode materials for supercapacitors, metal–air batteries, and fuel cells [ 9 ]. On the other hand, the GO based nano filtration membranes enhance the dye rejection and antifouling property in wastewater treatment and seawater desalination [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Surface Chemistry of Graphene Oxide on the Structure–Property Relationship of Waterborne Poly(urethane urea) Adhesive

Tounici

Martı́n-Martı́nez

2021

Materials

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Small amounts—0.04 wt.%—graphene oxide derivatives with different surface chemistry (graphene oxide—GO-, amine-functionalized GO—A-GO-, reduced GO—r-GO) were added during prepolymer formation in the synthesis of waterborne poly(urethane urea) dispersions (PUDs). Covalent interactions between the surface groups on the graphene oxide derivatives and the end NCO groups of the prepolymer were created, these interactions differently altered the degree of micro-phase separation of the PUDs and their structure–properties relationships. The amine functional groups on the A-GO surface reacted preferentially with the prepolymer, producing new urea hard domains and higher percentage of soft segments than in the PUD without GO derivative. All GO derivatives were well dispersed into the PU matrix. The PUD without GO derivative showed the most noticeable shear thinning and the addition of the GO derivative reduced the extent of shear thinning differently depending on its functional chemistry. The free urethane groups were dominant in all PUs and the addition of the GO derivative increased the percentage of the associated by hydrogen bond urethane groups. As a consequence, the addition of GO derivative caused a lower degree of micro-phase separation. All PUs containing GO derivatives exhibited an additional thermal decomposition at 190–206 °C which was ascribed to the GO derivative-poly(urethane urea) interactions, the lowest temperature corresponded to PU+A-GO. The PUs exhibited two structural relaxations, their temperatures decreased by adding the GO derivative, and the values of the maximum of tan delta in PU+r-GO and PU+A-GO were significantly higher than in the rest. The addition of the GO derivative increased the elongation-at-break, imparted some toughening, and increased the adhesion of the PUD. The highest T-peel strength values corresponded to the joints made with PUD+GO and PUD+r-GO, and a rupture of the substrate was obtained.

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“…21 The oxygencontaining groups of GO, negatively charged in water, are known to enhance the rejection of negatively charged molecules and anions by repelling electrostatic interaction. 42,43 Therefore, the rejection rate of GO is commonly decreased after reduction, particularly when the size of filtering molecules and ions are smaller than the interlayer spacing of the GO layer. 36 Therefore, we concluded that GO-EDA-PVDF membranes can be used to filter the molecules that have hydration radii larger than 8.0 Å with rejection over 95% and the rejection performance for Brilliant Blue is comparable to those of reported GO membranes on various polymeric supports: >90% of PC support (vacuum filtration), 21 ∼100% of nylon support (bar-coating).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Assembly of Graphene Oxide Nanosheets on Diamine-Treated PVDF Hollow Fiber as Nanofiltration Membranes

Eum

Kim

Choi

et al. 2020

ACS Appl. Polym. Mater.

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A graphene oxide (GO)-based nanofiltration membrane was fabricated on ethylenediamine-functionalizedpolyvinylidene fluoride (EDA-PVDF) hollow fibers. EDA-PVDF was prepared by hydrothermal treatment of polyvinylidene fluoride (PVDF) with ethylenediamine (EDA). On the basis of the interaction of oxygen-containing functional groups of GO and amine groups of EDA-PVDF fiber, a uniform GO layer can be formed in a few seconds by simple immersion of the EDA-crosslinked PVDF fiber in a GO aqueous solution. The GO layer thickness can be controlled from ∼20 nm to several micrometers depending on the concentration of the GO solution (0.5 − 20 mg/ mL). The GO layer is shown to be stable in water. The stability is attributed to the EDA in the EDA-PVDF fiber not only forming cross-links between GO and PVDF but also diffusing into the GO interlayer. Filtration tests with dye solutions show that the GO-EDA-PVDF fiber membrane can reject molecules with hydration radii larger than 8 Å (brilliant blue) with rejections (percentage of solute concentration of permeate removed from feed solution by the membrane) of over 95%. Finally, the stable performance of the GO-EDA-PVDF membrane is confirmed by practical crossflow filtration.

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The roles of oxygen-containing functional groups in modulating water purification performance of graphene oxide-based membrane

Cited by 102 publications

References 46 publications

Estimation of Number of Graphene Layers Using Different Methods: A Focused Review

Estimation of Number of Graphene Layers Using Different Methods: A Focused Review

Influence of the Surface Chemistry of Graphene Oxide on the Structure–Property Relationship of Waterborne Poly(urethane urea) Adhesive

Assembly of Graphene Oxide Nanosheets on Diamine-Treated PVDF Hollow Fiber as Nanofiltration Membranes

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