Graphene oxide powders with different oxidation degree, prepared by synthesis variations of the Hummers method

2015 ◽  
Vol 153 ◽  
pp. 209-220 ◽  
Author(s):  
Jesus Guerrero-Contreras ◽  
F. Caballero-Briones
Keyword(s):  
Graphene Oxide ◽  
Oxidation Degree ◽  
Hummers Method ◽  
Oxide Powders

Oxidation degree or sheet size: What really matters for the photothermal effect and ecotoxicity of graphene oxide?

FlatChem ◽  
2021 ◽  
Vol 26 ◽  
pp. 100231
Author(s):  
Caio C.C. Moreira ◽  
Ítalo A. Costa ◽  
Diego S. Moura ◽  
Cesar K. Grisolia ◽  
Carlos A.E.M. Leite ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Photothermal Effect ◽  
Oxidation Degree

Raman analysis of polypropylene fabric filled hummers method graphene oxide from regenerate carbon of waste tyre

2021 ◽  
Author(s):  
Noor Najmi Bonnia ◽  
Ain Zanaya Zanuri ◽  
Nor Dalila Nor Affendi ◽  
Nurdiana Samsulrizal
Keyword(s):  
Graphene Oxide ◽  
Raman Analysis ◽  
Hummers Method ◽  
Polypropylene Fabric ◽  
Waste Tyre

Graphene Oxide as a Substrate for Biosensors: Synthesis and Characterization

2021 ◽  
Vol 324 ◽  
pp. 87-93
Author(s):  
Mohamed Adel ◽  
Abdel Hady A. Abdel-Wahab ◽  
Ahmed Abdel-Mawgood ◽  
Ahmed Osman Egiza
Keyword(s):  
Raman Spectroscopy ◽  
Graphene Oxide ◽  
Acidic Solution ◽  
Cost Effective ◽  
Sem Analysis ◽  
Visible Spectroscopy ◽  
Sem Images ◽  
Hummers Method ◽  
Uv Visible ◽  
Modified Hummers Method

Graphene oxide (GO) is an oxidized nanosheets of graphite with a 2D planar structure. GO could be readily complexed with bio-entities as it possesses many oxygen-containing functionalities on its surface. The preparation process is fast, easy, and cost-effective. It was prepared using modified Hummers’ method in acidic solution as a primary solvent and potassium permanganate as an oxidizing agent. Afterwards, it was successfully characterized by FTIR, UV-visible spectroscopy, as well as XRD and Raman spectroscopy, and finally, SEM analysis. It was observed that the formed GO is mainly composed of carbon and oxygen elements rich in oxygen functional groups. Furthermore, the existence of (001) plane in XRD interprets the complete oxidation of graphite with d-spacing 9 Å. Moreover, Raman spectroscopy displayed the sp3 carbon hybridization, besides, the ID/IG ratio is found to be 0.84, which confirms the disorder between graphene oxide layers. The SEM images also pointed out that graphene oxide sheets were regularly stacked together as flake-like structures. Accordingly, the richness of oxygen-containing functionalities was confirmed. Hence, it is appropriate to be used as a base transducer for biosensing applications.

3D Graphene Oxide Hydrogel Derived from Waste Toner as Adsorbent

2021 ◽  
Vol 21 (10) ◽  
pp. 5275-5281
Author(s):  
Zhengshan Tian ◽  
Lijuan Sun ◽  
Hao Tian ◽  
Kesheng Cao ◽  
Suzhen Bai ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Removal Efficiency ◽  
Raw Materials ◽  
Three Dimensions ◽  
One Pot ◽  
Adsorptive Property ◽  
3D Graphene ◽  
Hummers Method ◽  
Removal Capacity ◽  
Living Things

Waste toner powders are considered as hazardous materials to human and living things, and should be properly recycled by many effective ways due to their fine particle sizes and complex components. In this paper, waste toner powders were used as raw materials to successfully synthesize three dimensions (3D) graphene oxide (GO) hydrogel by means of a one-pot chemical transformation based on the improved Hummers’ method. The obtained 3D GO hydrogel has porous structure and abundant oxygen-containing functional groups because of the inherent 3D solid structure of waste toner powder and the strong oxidation process of the improved Hummers’ method. Interestingly, the as-prepared 3D GO hydrogel with excellent adsorptive property could quickly remove Pb(II) ions (100 mg/L, removal efficiency of 96% and removal capacity of 144 mg/g) and methylene blue (50 mg/L, removal efficiency of 97% and removal capacity of 48 mg/g) from water, respectively. The preparation process of 3D GO hydrogel was simple and easy to operate, and the output can be moderately mass produced, thus it would provide a new and effective disposal way for the recycling and reusing of waste toner.

High-yield preparation of graphene oxide from small graphite flakes via an improved Hummers method with a simple purification process

Carbon ◽  
2015 ◽  
Vol 81 ◽  
pp. 826-834 ◽  
Author(s):  
Ji Chen ◽  
Yingru Li ◽  
Liang Huang ◽  
Chun Li ◽  
Gaoquan Shi
Keyword(s):  
Graphene Oxide ◽  
High Yield ◽  
Purification Process ◽  
Hummers Method

scholarly journals NANOFIBER PRODUCTION FROM LIQUEFIED HAZELNUT SHELL WITH THE ADDITION OF REDUCED GRAPHENE OXIDE AND POLYVINYL PYRROLIDONE

2020 ◽  
Vol 54 (9-10) ◽  
pp. 953-965
Author(s):  
ÖMER ÖNAL ◽  
MUSTAFA YAZICI ◽  
ISMAIL TIYEK ◽  
KONUS OGUZHAN ◽  
MEHMET HAKKI ALMA ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Lignocellulosic Biomass ◽  
Polyvinyl Pyrrolidone ◽  
Hummers Method ◽  
Reduced Graphene ◽  
Electrospinning Method ◽  
Hazelnut Shell ◽  
Hazelnut Shells

In this study, in order to produce nanofibers from waste hazelnut shells, a lignocellulosic biomass, firstly, liquefied hazelnut shell (LHS) was obtained by liquefaction of waste hazelnut shells using phenol and some chemicals. Then, reduced graphene oxide (RGO) was produced by Hummers’ method. RGO and polyvinyl pyrrolidone (PVP) were added to LHS, in certain proportions, to form seven different LHS-RGO-PVP solutions with ethanol/dimethylformamide (EtOH/DMF). From these solutions, nanofiber surfaces were obtained by a semi-industrial electrospinning device. The morphology of the nanofibers and the properties of the electrospinning solution were investigated, and it was observed that the optimum nanofibers were obtained from 7.5% LHS/10% PVP/5.6% RGO solution by the electrospinning method. It has been determined that the conductivity is slightly reduced by the addition of RGO to the solution, the viscosity is greatly reduced, the nanofiber diameters are reduced by approximately half, and thinner nanofibers are obtained

Tailoring thermal conductivity of bulk graphene oxide by tuning the oxidation degree

2018 ◽  
Vol 29 (5) ◽  
pp. 711-715 ◽  
Author(s):  
Qing-Long Meng ◽  
Hengchang Liu ◽  
Zhiwei Huang ◽  
Shuang Kong ◽  
Peng Jiang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Graphene Oxide ◽  
Oxidation Degree

The Synthesis and Characterization of the Graphene Oxide Covalent Modified Phenolic Resin Nanocomposites

2011 ◽  
Vol 327 ◽  
pp. 115-119 ◽  
Author(s):  
Duo Wang ◽  
Jie Gao ◽  
Wei Fang Xu ◽  
Feng Bao ◽  
Rui Ma ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Phenolic Resin ◽  
Synthesis And Characterization ◽  
Infrared Spectrometry ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Hummers Method ◽  
Modified Hummers Method ◽  
Thermal Stability Of

Graphene oxide (GO) was made by a modified Hummers method. Graphene oxide modified phenolic resin nanocomposites (GO/PF) were prepared by Steglich esterification, catalyzed by dicyclohexyl carbodiimide and 4-dimethylaminopyridine. The composites were characterized by Fourier transform infrared spectrometry, differential scanning calorimetry, X-ray powder diffraction, and scanning electron microscopy. The result revealed that the graphene oxide was absolutely exfoliated and covalent linked GO/PF composite was obtained. The thermal stability of PF is remarkably improved by modification with GO.

OBTAINING GRAPHENE OXIDE FROM GRAPHITE USING THE HUMMERS METHOD

2021 ◽  
pp. 40-55
Author(s):  
Dailson José de Queiroz Lima ◽  
Samantha Amorim Rebolledo ◽  
Everton Fabrício Franceschi ◽  
Leonardo Auco Brochetti
Keyword(s):  
Graphene Oxide ◽  
Hummers Method
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