scholarly journals Highly Controlled Integration of Graphene Oxide into PAN Nanofiber Membranes

2019 ◽  
Vol 9 (5) ◽  
pp. 962 ◽  
Author(s):  
Jian Hou ◽  
Jaehan Yun ◽  
Sungyul Kim ◽  
Hongsik Byun
Keyword(s):  
Graphene Oxide ◽  
Electrospun Nanofibers ◽  
Composite Membranes ◽  
Simple Modification ◽  
Exfoliated Graphene ◽  
Loading Efficiency ◽  
Nanofiber Membranes ◽  
And Performance ◽  
Pan Nanofiber ◽  
Reinforcing Filler

A highly improved strategy is established in order to systematically integrate excess exfoliated graphene oxide (GO) as fillers into polyacrylonitrile (PAN) nanofibers via electrospinning. Simple modification of GO surface allowed for their loading efficiency into the nanofibers to surpass the typical limits. Among many features, the hydrophilic and mechanical properties of these membranes were found to be significantly increased compared to the original PAN and bare GO-loaded membranes probably due to the effective reinforcing filler effect caused by the even distribution of the modified GO within the PAN nanofibers. Thus, the simple surface modification of fillers can facilitate the capability of controlling the loading efficiency into electrospun nanofibers which can highly impact the quality and performance of final composite membranes.

scholarly journals Mixed Dye Removal Efficiency of Electrospun Polyacrylonitrile–Graphene Oxide Composite Membranes

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2009 ◽  
Author(s):  
Wongi Jang ◽  
Jaehan Yun ◽  
Younggee Seo ◽  
Hongsik Byun ◽  
Jian Hou ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Composite Nanofibers ◽  
Precursor Solution ◽  
Composite Membranes ◽  
Aqueous System ◽  
Exfoliated Graphene ◽  
Nanofiber Membranes ◽  
Membrane Type ◽  
Pore Properties ◽  
Pan Nanofiber

Exfoliated graphene oxide (GO) was reliably modified with a cetyltrimethylammonium chloride (CTAC) surfactant to greatly improve the dispersity of the GO in a polyacrylonitrile (PAN) polymer precursor solution. Subsequent electrospinning of the mixture readily resulted in the formation of GO–PAN composite nanofibers containing up to 30 wt % of GO as a filler without notable defects. The absence of common electrospinning problems associated with clogging and phase separation indicated the systematic and uniform integration of the GO within the PAN nanofibers beyond the typical limits. After thoroughly examining the formation and maximum loading efficiency of the modified GO in the PAN nanofibers, the resulting composite nanofibers were thermally treated to form membrane-type sheets. The wettability and pore properties of the composite membranes were notably improved with respect to the pristine PAN nanofiber membrane, possibly due to the reinforcing filler effect. In addition, the more GO loaded into the PAN nanofiber membranes, the higher the removal ability of the methylene blue (MB) and methyl red (MR) dyes in the aqueous system. The adsorption kinetics of a mixed dye solution were also monitored to understand how these MB and MR dyes interact differently with the composite nanofiber membranes. The simple surface modification of the fillers greatly facilitated the integration efficiency and improved the ability to control the overall physical properties of the nanofiber-based membranes, which highly impacted the removal performance of various dyes from water.

Polysiloxane-functionalized graphene oxide paper: pyrolysis and performance as a Li-ion battery and supercapacitor electrode

RSC Advances ◽  
2016 ◽  
Vol 6 (78) ◽  
pp. 74323-74331 ◽  
Author(s):  
M. S. Kolathodi ◽  
L. David ◽  
M. A. Abass ◽  
G. Singh
Keyword(s):  
Graphene Oxide ◽  
Functionalized Graphene ◽  
Li Ion Battery ◽  
Supercapacitor Electrode ◽  
Free Standing ◽  
Functionalized Graphene Oxide ◽  
Exfoliated Graphene ◽  
Li Ion ◽  
Graphene Oxide Paper ◽  
And Performance

Exfoliated graphene oxide (GO) and polysiloxane were blended and pyrolyzed to synthesize free-standing SiOC–graphene composite papers.

Preparation of graphene oxide/silica hybrid composite membranes and performance studies in water treatment

2020 ◽  
Vol 55 (25) ◽  
pp. 11188-11202 ◽  
Author(s):  
Ying-chen Du ◽  
Lin-jun Huang ◽  
Yan-xin Wang ◽  
Kun Yang ◽  
Zhi-jie Zhang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Water Treatment ◽  
Performance Studies ◽  
Hybrid Composite ◽  
Composite Membranes ◽  
And Performance ◽  
Silica Hybrid

scholarly journals Synthesis and performance of antifouling and self-cleaning polyethersulfone/graphene oxide composite membrane functionalized with photoactive semiconductor catalyst

2016 ◽  
Vol 75 (3) ◽  
pp. 670-685 ◽  
Author(s):  
Nadir Dizge ◽  
Hakan Gonuldas ◽  
Yasin Ozay ◽  
Hasan Ates ◽  
Kasim Ocakoglu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Sol Gel ◽  
Composite Membranes ◽  
Graphite Powder ◽  
Inversion Method ◽  
Functionalized Membranes ◽  
Self Cleaning ◽  
And Performance ◽  
Pes Membrane ◽  
Phase Inversion Method

This study was performed to synthesize membranes of polyethersulfone (PES) blended with graphene oxide (GO) and PES blended with GO functionalized with photoactive semiconductor catalyst (TiO2 and ZnO). The antifouling and self-cleaning properties of composite membranes were also investigated. The GO was prepared from natural graphite powder by oxidation method at low temperature. TiO2 and ZnO nanopowders were synthesized by anhydrous sol–gel method. The surface of TiO2 and ZnO nanopowders was modified by a surfactant (myristic acid) to obtain a homogeneously dispersed mixture in a solvent, and then GO was functionalized by loading with these metal oxide nanopowders. The PES membranes blended with GO and functionalized GO into the casting solution were prepared via phase inversion method and tested for their antifouling as well as self-cleaning properties. The composite membranes were synthesized as 14%wt. of PES polymer with three different concentrations (0.5, 1.0, and 2.0%wt.) of GO, GO-TiO2, and GO-ZnO. The functionalization of membranes improved hydrophilicity property of membranes as compared to neat PES membrane. However, the lowest flux was obtained by functionalized membranes with GO-TiO2. The results showed that functionalized membranes demonstrated better self-cleaning property than neat PES membrane. Moreover, the flux recovery rate of functionalized membranes over five cycles was higher than that of neat membrane.

scholarly journals Investigating the Antibacterial Activity of Polymeric Membranes Fabricated with Aminated Graphene Oxide

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 510
Author(s):  
Muhammad Zahid ◽  
Saba Akram ◽  
Anum Rashid ◽  
Zulfiqar Ahmad Rehan ◽  
Talha Javed ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Graphene Oxide ◽  
Mechanical Stability ◽  
Water Flux ◽  
Composite Membranes ◽  
Inversion Method ◽  
Cellulose Acetate Membrane ◽  
Functionalized Graphene Oxide ◽  
And Performance ◽  
Phase Inversion Method

A novel, functionalized graphene oxide–based cellulose acetate membrane was fabricated using the phase inversion method to improve the membrane characteristics and performance. We studied the effect of aminated graphene oxide (NH2–GO) composite on the CA membrane characteristics and performance in terms of membrane chemistry, hydrophilicity, thermal and mechanical stability, permeation flux, and antibacterial activity. The results of contact angle and water flux indicate the improved hydrophilic behavior of composite membranes in comparison to that of the pure CA membrane. The AGO-3 membrane showed the highest water flux of about 153 Lm−2h−1. The addition of hydrophilic AGO additive in CA membranes enhanced the antibacterial activity of AGO–CA membranes, and the thermal stability of the resulting membrane also improved since it increases the Tg value in comparison to that of a pristine CA membrane. The aminated graphene oxide (NH2–GO) was, therefore, found to be a promising additive for the fabrication of composite membranes with potent applications in wastewater treatment.

scholarly journals The efficiency of chitosan-graphene oxide composite membranes modified with genipin in fuel cell application

2022 ◽  
Vol 334 ◽  
pp. 04002
Author(s):  
Selestina Gorgieva ◽  
Azra Osmić ◽  
Boštjan Genorio ◽  
Viktor Hacker ◽  
Sigrid Wolf ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Graphene Oxide ◽  
Crosslinking Agent ◽  
Composite Membranes ◽  
Anion Exchange Membranes ◽  
Nanocomposite Membranes ◽  
Fuel Cell Application ◽  
Reduced Graphene ◽  
Cell Test ◽  
And Performance

The paper reports on the processing of chitosan N-doped reduced graphene oxide (CS/N-rGO) nanocomposite membranes prepared by a facile, dispersion-casting procedure aimed as anion exchange membranes in fuel cells. Genipin (GEN) was used as a crosslinking agent to ameliorate mechanical weakens of nanocomposite membranes, while the N-rGO filler, aside of its role as a mechanical enhancer, is expected to improve the ionic conductivity of membranes. The resulting properties of processed membranes in terms of morphology, tensile strength, elasticity, and ethanol permeability were examined. The relevance of the membranes in terms of efficiency and performance was demonstrated in a single cell test.

Effects of graphene oxide incorporation on the mat structure and performance of carbon nanotube composite membranes

2018 ◽  
Vol 45 (2) ◽  
pp. 533-548 ◽  
Author(s):  
Huimin Huang ◽  
Jiayi Sheng ◽  
Feiyue Qian ◽  
Feng Zhou ◽  
Shiqian Gao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Carbon Nanotube ◽  
Composite Membranes ◽  
Carbon Nanotube Composite ◽  
And Performance

scholarly journals Effect of Graphene Oxide Synthesis Method on Properties and Performance of Polysulfone-Graphene Oxide Mixed Matrix Membranes

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 769 ◽  
Author(s):  
Safae Sali ◽  
Hamish R. Mackey ◽  
Ahmed A. Abdala
Keyword(s):  
Graphene Oxide ◽  
Water Flux ◽  
Synthesis Method ◽  
Composite Membranes ◽  
Mixed Matrix Membranes ◽  
Great Promise ◽  
Mixed Matrix ◽  
Water Emulsion ◽  
The Matrix ◽  
And Performance

Graphene oxide (GO) has shown great promise as a nanofiller to enhance the performance of mixed matrix composite membranes (MMMs) for water treatment applications. However, GO can be prepared by various synthesis routes, leading to different concentrations of the attached oxygen functional groups. In this research, GO produced by the Hummers’, Tour, and Staudenmaier methods were characterized and embedded at various fractions into the matrix of polysulfone (PSf) and used to prepare microfiltration membranes via the phase inversion process. The effects of the GO preparation method and loading on the membrane characteristics, as well as performance for oil removal from an oil-water emulsion, are analyzed. Our results reveal that GO prepared by the Staudenmaier method has a higher concentration of the more polar carbonyl group, increasing the membrane hydrophilicity and porosity compared to GO prepared by the Hummers’ and Tour methods. On the other hand, the Hummers’ and Tour methods produce GO with larger sheet size, and are more effective in enhancing the mechanical properties of the PSf membrane. Finally, all MMMs exhibited improved water flux (up to 2.7 times) and oil rejection, than those for the control PSf sample, with the optimum GO loading ranged between 0.1–0.2 wt%.

scholarly journals Extraordinary thermal behavior of graphene oxide in air for electrode applications

2021 ◽  
Author(s):  
Joong Tark Han ◽  
Joon Young Cho ◽  
Jeong Hoon Kim
Keyword(s):  
Thermal Stability ◽  
Graphene Oxide ◽  
Physical Properties ◽  
Thermal Behavior ◽  
Stability Of Solution ◽  
Exfoliated Graphene ◽  
Potential Applications ◽  
Thermal Stability Of

The thermal stability of solution-exfoliated graphene oxide (GO) in air is one of the most important physical properties influencing its potential applications. To date, majority of the GO prepared by...

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