Nano Archive

Ozone reaction with carbon nanostructures 2: The reaction of ozone with milled graphite and different carbon black grades

Cataldo, Franco (2007) Ozone reaction with carbon nanostructures 2: The reaction of ozone with milled graphite and different carbon black grades. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 7 (4-5). pp. 1446-1454.

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Official URL: http://www.ingentaconnect.com/content/asp/jnn/2007...

Abstract

Synthetic graphite particles 0.2 microns in diameter react with O-3 at room temperature with evolution of CO2. Graphite is less reactive with ozone than carbon blacks having different surface area ranging from 120 to 8 m(2)/g, but graphite reactivity is comparable to that shown by powdered solid C-60 and C-70 fullerenes. The kinetic rate constant derived from the ozone consumption k appears in relation with the rate of CO2 evolution suggesting a very simple reaction stoichiometry at the early stages. The reaction between ozone and graphite or carbon blacks essentially involves two stages: the gasification of the surface to CO2 and its functionalization with oxygenated chemical groups, mainly as COOH but also other oxygenated chemical moieties. The pseudofirst order kinetics appears adequate to describe the heterogeneous reaction between ozone and the selected carbon materials. The discussion of the results is focused on the role played by fullerene-like carbon nanostructures, present in graphene sheets to explain the observed gasification rates and surface functionalization.

Item Type:Article
Uncontrolled Keywords:milled graphite; carbon black; carbon nanostructures; ozone; ozonization; functional groups; gasification
Subjects:Material Science > Functional and hybrid materials
Material Science > Nanochemistry
ID Code:2824
Deposited By:Farnush Anwar
Deposited On:13 Jan 2009 15:27
Last Modified:27 Jan 2009 11:26

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