scholarly journals Aqueous electromigration of single-walled carbon nanotubes and co-electromigration with copper ions

Nanoscale ◽  
2018 ◽  
Vol 10 (41) ◽  
pp. 19628-19637 ◽  
Author(s):  
Pavan M. V. Raja ◽  
Gibran L. Esquenazi ◽  
Kourtney D. Wright ◽  
Cathren E. Gowenlock ◽  
Bruce E. Brinson ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Metal Ions ◽  
Functional Groups ◽  
Copper Ions ◽  
Single Walled Carbon Nanotubes ◽  
Surface Functional Groups ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

The direction of electromigration of SWCNTs in the absence of surfactant depends on the presence of catalyst residue, surface functional groups and adsorbed metal ions.

scholarly journals Carbon nanotubes functionalized with copper hexacyanoferrate nanoparticles for a selective extraction of cesium from liquid waste

2018 ◽  
Vol 3 (2) ◽  
Author(s):  
H. Draouil ◽  
L. Alvarez ◽  
J. Causse ◽  
V. Flaud ◽  
M.A. Zaibi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Copper Ions ◽  
Liquid Waste ◽  
Single Walled Carbon Nanotubes ◽  
Selective Extraction ◽  
Carbon Supports ◽  
Copper Hexacyanoferrate ◽  
Single Walled Carbon ◽  
High Sorption ◽  
Walled Carbon Nanotubes

Single-walled carbon nanotubes are functionalized with copper hexacyanoferrate nanoparticles for the liquid-solid extraction of cesium from liquid waste and contaminated water. The functionalization process is followed mainly by x-ray photoemission spectroscopy. Indeed, determining the chemical environment around carbon or nitrogen atoms allows to evidence the formation of covalent bounding. In addition, the signatures of iron and copper ions give information on the effective growth of hexacyanoferrate nanoparticles. Furthermore, the cesium sorption mechanism is investigated by comparing the peak intensities associated to the response of potassium and cesium ions. Finally, based on the liquid chromatography analyzes, the sorption of cesium with the functionalized carbon supports is studied. The main results of this work are the demonstration of both a good selectivity of cesium trapping and a high sorption capacity by hybrid single-walled carbon nanotubes.

scholarly journals Chemi- vs physisorption in the radical functionalization of single-walled carbon nanotubes under microwaves

2014 ◽  
Vol 5 ◽  
pp. 537-545 ◽  
Author(s):  
Victor Mamane ◽  
Guillaume Mercier ◽  
Junidah Abdul Shukor ◽  
Jérôme Gleize ◽  
Aziz Azizan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Functional Groups ◽  
Physical Adsorption ◽  
Reaction Times ◽  
Single Walled Carbon Nanotubes ◽  
Chemical Mechanisms ◽  
Single Walled Carbon ◽  
Chemical Grafting ◽  
Grafting From ◽  
Walled Carbon Nanotubes

The effect of microwaves on the functionalization of single-walled carbon nanotubes (SWNTs) by the diazonium method was studied. The usage of a new approach led to the identification of the strength of the interaction (physical or chemical) between the functional groups and the carbon nanotube surface. Moreover, the nature (chemical formula) of the adsorbed/grafted functional groups was determined. According to thermogravimetric analysis coupled with mass spectrometry and Raman spectroscopy, the optimal functionalization level was reached after 5 min of reaction. Prolonged reaction times can lead to undesired reactions such as defunctionalization, solvent addition and polymerization of the grafted functions. The strength (chemi- vs physisorption) of the bonds between the grafted functional groups and the SWNTs is discussed showing the occurrence of physical adsorption as a consequence of defunctionalization after 15 min of reaction under microwaves. Several chemical mechanisms of grafting could be identified, and it was possible to distinguish conditions leading to the desired chemical grafting from those leading to undesired reactions such as physisorption and polymerization.

Well dispersed single-walled carbon nanotubes with strong visible fluorescence in water for metal ions sensing

2011 ◽  
Vol 47 (25) ◽  
pp. 7167 ◽  
Author(s):  
Zhaosheng Qian ◽  
Chen Wang ◽  
Hui Feng ◽  
Congcong Chen ◽  
Jin Zhou ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Metal Ions ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes
Sign in / Sign up

Export Citation Format

Share Document