Carboxyl Groups do not Play the Major Role in Binding Metal Cations by Graphene Oxide

2021 ◽  
Author(s):  
Julia Shayimova ◽  
Rustem R. Amirov ◽  
Artem Iakunkov ◽  
Alexandr Talyzin ◽  
Ayrat Dimiev
Keyword(s):  
Graphene Oxide ◽  
Aqueous Solutions ◽  
Nmr Relaxation ◽  
Metal Cations ◽  
Carboxyl Groups ◽  
Chemical Interactions ◽  
Graphene Oxides

In this study, we investigate chemical interactions of Mn2+ ions with graphene oxides, prepared by Hummers (HGO) and Brodie (BGO) methods in aqueous solutions by means of the NMR relaxation....

Graphene Modified Cotton Textiles

2011 ◽  
Vol 331 ◽  
pp. 93-96 ◽  
Author(s):  
Wen Long Gu ◽  
Yong Nan Zhao
Keyword(s):  
Graphene Oxide ◽  
Reactive Dyes ◽  
Structural Features ◽  
Cotton Cloth ◽  
Carboxyl Groups ◽  
Graphene Oxides ◽  
Cotton Textiles

The graphene oxides are abundant in hydroxyl and carboxyl groups that are close to the reactive dyes. These structural features gave a possibility to modify textiles to enhance the conductivity by using the dyeing and finishing method. Herein, graphene modified cotton textiles are fabricated by soaking cotton cloth in graphene oxide colloid. After reduction, the modified textiles exhibit an improved conductivity. The present work contributed a facile strategy for graphene modified textiles.

Analysis of competitive binding of several metal cations by graphene oxide reveals the quantity and spatial distribution of carboxyl groups on its surface

2018 ◽  
Vol 20 (4) ◽  
pp. 2320-2329 ◽  
Author(s):  
Rustem R. Amirov ◽  
Julia Shayimova ◽  
Zarina Nasirova ◽  
Alexander Solodov ◽  
Ayrat M. Dimiev
Keyword(s):  
Spatial Distribution ◽  
Graphene Oxide ◽  
Binding Sites ◽  
Metal Cations ◽  
Competitive Binding ◽  
Carboxyl Groups ◽  
Different Types

GO contains two different types of binding sites, bonding to which results either in high or low NMR relaxivity of resulted Gd3+–GO and Mn2+–GO solutions.

Effects of pH and electrolytes on the sheet-to-sheet aggregation mode of graphene oxide in aqueous solutions

2020 ◽  
Vol 7 (3) ◽  
pp. 984-995
Author(s):  
Huan Tang ◽  
Shuyan Zhang ◽  
Tinglin Huang ◽  
Fuyi Cui ◽  
Baoshan Xing
Keyword(s):  
Graphene Oxide ◽  
Aqueous Solutions ◽  
Metal Cations ◽  
Effects Of Ph

Aggregation mode mediated by protonation and metal cations.

Application of graphene oxides and graphene oxide-based nanomaterials in radionuclide removal from aqueous solutions

2016 ◽  
Vol 61 (20) ◽  
pp. 1583-1593 ◽  
Author(s):  
Xiangxue Wang ◽  
Shujun Yu ◽  
Jie Jin ◽  
Hongqing Wang ◽  
Njud S. Alharbi ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Aqueous Solutions ◽  
Graphene Oxides ◽  
Radionuclide Removal

Chemical interactions and ecotoxicity effects between graphene oxide and Lemna gibba

2021 ◽  
pp. 1-9
Author(s):  
Federica Valentini ◽  
Mattia Di Giacobbe ◽  
Lucia Bertuccini ◽  
Francesca Iosi ◽  
Klaudia Krasojevic ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Lemna Gibba ◽  
Chemical Interactions

X-Ray Photoelectron Spectroscopy Study on Reduction of Graphene Oxide with Hydrazine Hydrate

2011 ◽  
Vol 287-290 ◽  
pp. 539-543 ◽  
Author(s):  
Wen Shi Ma ◽  
Jun Wen Zhou ◽  
Xiao Dan Lin
Keyword(s):  
Graphene Oxide ◽  
Hydrazine Hydrate ◽  
Photoelectron Spectroscopy ◽  
Reduction Rate ◽  
Reduction Reaction ◽  
Chemical Compositions ◽  
Total Oxygen ◽  
Graphene Oxides ◽  
X Ray ◽  
Oxygen Groups

Graphene oxide was prepared through Hummers' method，then different reduced graphenes were prepared via reduction of graphene oxide with hydrazine hydrate for 1h、12h and 24h. X-ray photoelectron spectroscopy (XPS) was used for the characterization of graphene oxide and the reduced graphenes. The variation of the contents of carbon in carbon and oxygen functional groups and chemical compositions of graphene oxides were investigated through analysis the content of different carbon atoms in different reduced graphenes. The results showed that the reduction reaction was very fast in the first 1 h, the content of total oxygen bonded carbon atoms decreased from 83.6% to 22.1%, and then after the reduction rate became very slow. After 12h, the content of total oxygen bonded carbon atom is 19.56%, only 2.54% lower than that of 1h’s. At the same time, C-N was introduced in the graphene oxides; this increased the stereo-hindrance for hydrazine hydrate attacking the C-Oxygen groups, thus reduced the reduction rate. After reduction for 24h, there still exists 16.4% oxygen bonded carbon atoms and the total conversion ratio of graphene approaches 70%.

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