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Titolo:
WATER-ADSORPTION ON ACTIVATED CARBONS WITH DIFFERENT DEGREES OF OXIDATION
Autore:
CARRASCOMARIN F; MUEDEN A; CENTENO TA; STOECKLI F; MORENOCASTILLA C;
Indirizzi:
UNIV GRANADA,FAC CIENCIAS,DEPT QUIM INORGAN,GRP INVEST CARBONES E-18071 GRANADA SPAIN UNIV GRANADA,FAC CIENCIAS,DEPT QUIM INORGAN,GRP INVEST CARBONES E-18071 GRANADA SPAIN UNIV NEUCHATEL,DEPT CHEM CH-2000 NEUCHATEL SWITZERLAND
Titolo Testata:
Journal of the Chemical Society. Faraday transactions
fascicolo: 12, volume: 93, anno: 1997,
pagine: 2211 - 2215
SICI:
0956-5000(1997)93:12<2211:WOACWD>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
VAPOR ADSORPTION; DUBININ-ASTAKHOV; PORE TEXTURE; ADSORBENTS; IMMERSION; ISOTHERM; EQUATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
F. Carrascomarin et al., "WATER-ADSORPTION ON ACTIVATED CARBONS WITH DIFFERENT DEGREES OF OXIDATION", Journal of the Chemical Society. Faraday transactions, 93(12), 1997, pp. 2211-2215

Abstract

A typical activated carbon, derived from olive stones, has been oxidized to different degrees with (NH4)(2)S2O8 and analysed by water vapour adsorption, immersion calorimetry, acid-base titration and temperature-programmed desorption of CO2 and CO monitored by mass spectrometry. These techniques led to a coherent description of the surfaces and oftheir chemistry. The water adsorption isotherms, of type IV, were decomposed into type I and V contributions and analysed in terms of the Dubinin-Astakhov equation. The corresponding calculated enthalpies of immersion into water are in agreement with the experimental values. Thenumber of carboxyl, lactone, phenol and basic groups identified by titration, can also be related to the parameters of the Dubinin-Astakhovequation and to the enthalpy of immersion into water. Finally, a goodlinear correlation is found between the amounts of CO2 and CO desorbed from the surface, the enthalpies of immersion into water and the total number of sites identified on the surface.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 08:49:57