Modification of the surface chemistry of single- and multi-walled carbon nanotubes by HNO3 and H2SO4 hydrothermal oxidation for application in direct contact membrane distillation

2014 ◽  
Vol 16 (24) ◽  
pp. 12237-12250 ◽  
Author(s):  
Sergio Morales-Torres ◽  
Tânia L. S. Silva ◽  
Luisa M. Pastrana-Martínez ◽  
Ana T. S. C. Brandão ◽  
José L. Figueiredo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Surface Chemistry ◽  
Direct Contact ◽  
Membrane Distillation ◽  
Salty Water ◽  
Hydrothermal Oxidation ◽  
Direct Contact Membrane Distillation ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Modification Of The Surface

Buckypapers prepared using CNTs with tailored surface chemistry showed better performance than the commercial PTFE in membrane distillation of salty water.

scholarly journals Solid-phase extraction cartridges with multi-walled carbon nanotubes and effect of the oxygen functionalities on the recovery efficiency of organic micropollutants

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Marta O. Barbosa ◽  
Rui S. Ribeiro ◽  
Ana R. L. Ribeiro ◽  
M. Fernando R. Pereira ◽  
Adrián M. T. Silva
Keyword(s):  
Carbon Nanotubes ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Surface Groups ◽  
Phase Extraction ◽  
Organic Micropollutants ◽  
Oxidation Method ◽  
Hydrothermal Oxidation ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

AbstractPristine and functionalized multi-walled carbon nanotubes (MWCNTs) were investigated as adsorbent materials inside solid-phase extraction (SPE) cartridges for extraction and preconcentration of 8 EU-relevant organic micropollutants (with different pKa and polarity) before chromatographic analysis of surface water. The recoveries obtained were > 60% for 5/8 target pollutants (acetamiprid, atrazine, carbamazepine, diclofenac, and isoproturon) using a low amount of this reusable adsorbent (50 mg) and an eco-friendly solvent (ethanol) for both conditioning and elution steps. The introduction of oxygenated surface groups in the carbon nanotubes by using a controlled HNO3 hydrothermal oxidation method, considerably improved the recoveries obtained for PFOS (perfluorooctanesulfonic acid) and methiocarb, which was ascribed to the hydrogen bond adsorption mechanism, but decreased those observed for the pesticide acetamiprid and for two pharmaceuticals (carbamazepine and diclofenac), suggesting π–π dispersive interactions. Moreover, a good correlation was found between the recovery obtained for methiocarb and the amount of oxygenated surface groups on functionalized MWCNTs, which was mainly attributed to the increase of phenols and carbonyl and quinone groups. Thus, the HNO3 hydrothermal oxidation method can be used to finely tune the surface chemistry (and texture) of MWCNTs according to the specific micropollutants to be extracted and quantified in real water samples.

Supported Pt-particles on multi-walled carbon nanotubes with controlled surface chemistry

2012 ◽  
Vol 66 (1) ◽  
pp. 64-67 ◽  
Author(s):  
Raquel P. Rocha ◽  
Adrián M.T. Silva ◽  
Goran Dražić ◽  
Manuel F.R. Pereira ◽  
José L. Figueiredo
Keyword(s):  
Carbon Nanotubes ◽  
Surface Chemistry ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals The adsorption of biomolecules to multi-walled carbon nanotubes is influenced by both pulmonary surfactant lipids and surface chemistry

2010 ◽  
Vol 8 (1) ◽  
pp. 31 ◽  
Author(s):  
Michael Gasser ◽  
Barbara Rothen-Rutishauser ◽  
Harald F Krug ◽  
Peter Gehr ◽  
Mathias Nelle ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Surface Chemistry ◽  
Pulmonary Surfactant ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Influence of the surface chemistry of multi-walled carbon nanotubes on their activity as ozonation catalysts

Carbon ◽  
2010 ◽  
Vol 48 (15) ◽  
pp. 4369-4381 ◽  
Author(s):  
Alexandra G. Gonçalves ◽  
José L. Figueiredo ◽  
José J.M. Órfão ◽  
Manuel F.R. Pereira
Keyword(s):  
Carbon Nanotubes ◽  
Surface Chemistry ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes
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