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Adsorption of volatile sulphur compounds onto modified activated carbons: effect of oxygen functional groups

The effect of physical and chemical properties of activated carbon (AC) on the adsorption of ethyl mercaptan, dimethyl sulphide and dimethyl disulphide was investigated by treating a commercial AC with nitric acid and ozone. The chemical properties of ACs were characterised by temperature programme desorption and X-ray photoelectron spectroscopy. AC treated with nitric acid presented a larger amount of oxygen functional groups than materials oxidised with ozone. This enrichment allowed a significant improvement on adsorption capacities for ethyl mercaptan and dimethyl sulphide but not for dimethyl disulphide. In order to gain a deeper knowledge on the effect of the surface chemistry of AC on the adsorption of volatile sulphur compounds, the quantum-chemical COSMO-RS method was used to simulate the interactions between AC surface groups and the studied volatile sulphur compounds. In agreement with experimental data, this model predicted a greater affinity of dimethyl disulphide towards AC, unaffected by the incorporation of oxygen functional groups in the surface. Moreover, the model pointed out to an increase of the adsorption capacity of AC by the incorporation of hydroxyl functional groups in the case of ethyl mercaptan and dimethyl sulphide due to the hydrogen bond interactions

R. Gonzalez Olmos thanks MICINN for the Juan de la Cierva fellowship (JCI-2010-07104). We also greatly appreciate financial support from the Spanish "Ministerio de Ciencia e Innovacion (MICINN)" and "Comunidad de Madrid" (projects PET2008_0261, CTQ2011-24114, CTQ2011-26758, CTQ2009-09983 and S2009/PPQ-1545) and "Centro de Computacion Cientifica de la Universidad Autonoma de Madrid" for computational facilities

© Journal of Hazardous Materials, 2013, vol. 258-259, p. 77-83

Elsevier

Autor: Vega Martínez, ESther
Lemus, Jesús
Anfruns Bagaria, Alba
González Olmos, Rafael
Palomar, José
Martín, María José
Data: 4 maig 2013
Resum: The effect of physical and chemical properties of activated carbon (AC) on the adsorption of ethyl mercaptan, dimethyl sulphide and dimethyl disulphide was investigated by treating a commercial AC with nitric acid and ozone. The chemical properties of ACs were characterised by temperature programme desorption and X-ray photoelectron spectroscopy. AC treated with nitric acid presented a larger amount of oxygen functional groups than materials oxidised with ozone. This enrichment allowed a significant improvement on adsorption capacities for ethyl mercaptan and dimethyl sulphide but not for dimethyl disulphide. In order to gain a deeper knowledge on the effect of the surface chemistry of AC on the adsorption of volatile sulphur compounds, the quantum-chemical COSMO-RS method was used to simulate the interactions between AC surface groups and the studied volatile sulphur compounds. In agreement with experimental data, this model predicted a greater affinity of dimethyl disulphide towards AC, unaffected by the incorporation of oxygen functional groups in the surface. Moreover, the model pointed out to an increase of the adsorption capacity of AC by the incorporation of hydroxyl functional groups in the case of ethyl mercaptan and dimethyl sulphide due to the hydrogen bond interactions
R. Gonzalez Olmos thanks MICINN for the Juan de la Cierva fellowship (JCI-2010-07104). We also greatly appreciate financial support from the Spanish "Ministerio de Ciencia e Innovacion (MICINN)" and "Comunidad de Madrid" (projects PET2008_0261, CTQ2011-24114, CTQ2011-26758, CTQ2009-09983 and S2009/PPQ-1545) and "Centro de Computacion Cientifica de la Universidad Autonoma de Madrid" for computational facilities
Format: application/pdf
ISSN: 0304-3894 (versió paper)
1873-3336 (versió electrònica)
Accés al document: http://hdl.handle.net/10256/11288
Llenguatge: eng
Editor: Elsevier
Col·lecció: MICINN/PN 2012-2015/CTQ2011-24114
MICYT/PN 2009-2011/PET2008_0261
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.jhazmat.2013.04.043
Articles publicats (D-EQATA)
És part de: © Journal of Hazardous Materials, 2013, vol. 258-259, p. 77-83
Drets: Tots els drets reservats
Matèria: Carbó activat
Carbon, Activated
Compostos orgànics volàtils
Volatile organic compounds
Absorció
Absorption
Títol: Adsorption of volatile sulphur compounds onto modified activated carbons: effect of oxygen functional groups
Tipus: info:eu-repo/semantics/article
Repositori: DUGiDocs

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