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Issue 33, 2013
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Oxidized few layer graphene and graphite as metal-free catalysts for aqueous sulfide oxidation

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Abstract

Few layer graphene and natural graphite were chemically modified by oxidation with HNO3 at 80 and 140 °C and used to promote the oxidation of sulfide ions in aqueous solutions. TEM, potentiometric titration, XRD, BET and Raman spectroscopy show that HNO3 treatment even at 140 °C did not modify the graphene and graphite morphologies but produced significant amounts of different oxygen surface groups. The presence of these groups on few layer graphene and graphite strongly increased the Saq2− oxidation, showing activities comparable to a high surface area activated carbon with a similar amount of oxygen surface groups. The obtained results suggest that the sulfide oxidation efficiency requires a balance between two important effects, i.e. the presence of oxygen functionalities to initiate the Saq2− oxidation and the electrical conductivity that is important to further transfer the electrons removed from sulfide.

Graphical abstract: Oxidized few layer graphene and graphite as metal-free catalysts for aqueous sulfide oxidation

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Publication details

The article was received on 04 Feb 2013, accepted on 03 Apr 2013 and first published on 03 Apr 2013


Article type: Paper
DOI: 10.1039/C3TA10541E
Citation: J. Mater. Chem. A, 2013,1, 9491-9497
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    Oxidized few layer graphene and graphite as metal-free catalysts for aqueous sulfide oxidation

    B. R. S. Lemos, I. F. Teixeira, B. F. Machado, M. R. A. Alves, J. P. de Mesquita, R. R. Ribeiro, R. R. Bacsa, P. Serp and R. M. Lago, J. Mater. Chem. A, 2013, 1, 9491
    DOI: 10.1039/C3TA10541E

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