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Titolo:
THERMAL-DESORPTION OF GALLIC ACID FROM ACTIVATED CARBON SURFACES
Autore:
RIVERAUTRILLA J; FERROGARCIA MA; MORENOCASTILLA C; BAUTISTATOLEDO I; JOLY JP;
Indirizzi:
UNIV GRANADA,FAC CIENCIAS,DEPT QUIM INORGAN E-18071 GRANADA SPAIN UNIV LYON 1,ESCIL,INST SCI MAT,APPLICAT CHIM ENVIRONM LAB F-69622 VILLEURBANNE FRANCE
Titolo Testata:
Journal of the Chemical Society. Faraday transactions
fascicolo: 18, volume: 91, anno: 1995,
pagine: 3213 - 3217
SICI:
0956-5000(1995)91:18<3213:TOGAFA>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
AQUEOUS-SOLUTIONS; REGENERATION; CHLOROPHENOLS; COLUMNS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
J. Riverautrilla et al., "THERMAL-DESORPTION OF GALLIC ACID FROM ACTIVATED CARBON SURFACES", Journal of the Chemical Society. Faraday transactions, 91(18), 1995, pp. 3213-3217

Abstract

The thermal regeneration processes of two spent activated carbons from olive stones loaded with gallic acid (3, 4,5-trihydroxybenzoic acid)have been studied by differential thermogravimetry (DTG) and by mass spectrometric temperature-programmed desorption (TPD-MS). The samples were heated to 1250 K in an inert gas flow both dry and wet. The percentage of gallic acid removed with regard to the amount adsorbed is between 70 and 80% and it depends on the activation degree of the carbon sample which affects the activated carbon-gallic acid interactions. Atlow temperatures a fraction of physisorbed gallic acid is released asheavy compounds and the rest is transformed to chemisorbed. Between 400 and 800 K the process is dominated by the decomposition of the chemisorbed garlic acid into CO2, H2O and CO. At temperatures higher than 800 K, ring condensation reactions take place. The presence of water in the regeneration atmosphere enhances the transformation of physisorbed to chemisorbed gallic acid, degrades a fraction of the heavy compounds leaving the carbon surface to lighter compounds and gasifies the activated carbon up to 0.5% burn-off.

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Documento generato il 11/07/20 alle ore 21:06:24