Effective removal of arsenic from an aqueous solution by ferrihydrite/goethite graphene oxide composites using the modified Hummers method

2020 ◽  
Vol 8 (6) ◽  
pp. 104416
Author(s):  
M. Vazquez-Jaime ◽  
J.A. Arcibar-Orozco ◽  
C.E. Damian-Ascencio ◽  
A.L. Saldaña-Robles ◽  
M. Martínez-Rosales ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Hummers Method ◽  
Effective Removal ◽  
Removal Of Arsenic ◽  
Oxide Composites ◽  
Modified Hummers Method

Effects of Polypyrrole/Graphene Oxide Composites with Different Reaction Times on Electrochemical Performance

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Minzhen Feng
Keyword(s):  
Composite Material ◽  
Graphene Oxide ◽  
Electrochemical Performance ◽  
Reaction Times ◽  
Second Step ◽  
Hummers Method ◽  
Oxide Composites ◽  
Oxide Composite Material ◽  
Modified Hummers Method

Abstract: Graphene oxide (GO) was prepared using the modified Hummers method and used as a template for polypyrrole. Polypyrrole was polymerized in situ on the surface of GO to finally obtain the polypyrrole/graphene oxide composite material. The effects of different reaction times on the electrochemical performance of polypyrrole/graphene oxide in the second step were studied. It was obtained that the composite material had optimal properties when the reaction time was 24 h.

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.

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.

Persimmon tannin/graphene oxide composites: Fabrication and superior adsorption of germanium ions in aqueous solution

2019 ◽  
Vol 104 ◽  
pp. 310-317 ◽  
Author(s):  
Yingying Zhang ◽  
Xinzhu Li ◽  
Lifeng Gong ◽  
Zhiqiang Xing ◽  
Zhenning Lou ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Oxide Composites

Mechanical and thermal properties of graphene oxide/ultrahigh molecular weight polyethylene nanocomposites

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 63063-63072 ◽  
Author(s):  
Wenchao Pang ◽  
Zifeng Ni ◽  
Guomei Chen ◽  
Guodong Huang ◽  
Huadong Huang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Graphene Oxide ◽  
Thermal Properties ◽  
Ultrahigh Molecular Weight Polyethylene ◽  
Mechanical And Thermal Properties ◽  
Hummers Method ◽  
Ultrahigh Molecular Weight ◽  
Uhmwpe Composites ◽  
Modified Hummers Method

Graphene oxide (GO) was prepared according to a modified Hummers method, and a range of GO/ultrahigh molecular weight polyethylene (UHMWPE) composites were fabricated then their mechanical and thermal properties were investigated.

Synthesis and application of magnetic reduced graphene oxide composites for the removal of bisphenol A in aqueous solution—a mechanistic study

RSC Advances ◽  
2016 ◽  
Vol 6 (104) ◽  
pp. 102348-102358 ◽  
Author(s):  
Penglei Wang ◽  
Xin Zhou ◽  
Yagang Zhang ◽  
Lulu Wang ◽  
Keke Zhi ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Bisphenol A ◽  
Reduced Graphene Oxide ◽  
Mechanistic Study ◽  
Reduction Degree ◽  
Reduced Graphene ◽  
Oxide Composites ◽  
Magnetic Reduced Graphene Oxide

Magnetic reduced graphene oxide composites (MRGO) with different reduction degree for removal of bisphenol A from aqueous solution

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