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Understanding phenol adsorption mechanisms on activated carbons

AutorFernández Velasco, Leticia ; Ovín Ania, María Concepción
Palabras claveActivated carbon
Phenol
Physisorption
Chemisorption
Fecha de publicaciónfeb-2011
EditorSpringer
CitaciónAdsorption 17(1): 247-254 (2011)
ResumenThe interactions between phenol molecules and activated carbons were investigated in order to understand the adsorption mechanism of this aromatic compound. A series of activated carbons with varied chemical composition but similar porous features were synthesized and submitted to phenol exposure from aqueous phase, followed by thermogravimetric analysis and identification of the desorbed species by temperature programmed desorption coupled with mass spectrometry. Based on these experiments, both physi- and chemisorption sites for phenol were identified on the activated carbons. Our results demonstrate that physisorption of phenol depends strictly on the porosity of the activated carbons, whereas chemisorption depends on the availability of the basal planes in the activated carbons. Thus, oxidation of the carbon can suppress the fraction of chemisorbed phenol since the surface functionalities incorporate to the edges of the basal planes; notwithstanding, hydrophilic carbons may present a small but not negligible contribution of chemisorbed phenol depending on the extent of the functionalization. Moreover, these adsorption sites (chemi-) are recovered by simply removal of the surface functionalities after thermal annealing.
Versión del editorhttp://dx.doi.org/10.1007/s10450-011-9322-x
URIhttp://hdl.handle.net/10261/98685
DOI10.1007/s10450-011-9322-x
ISSN0929-5607
E-ISSN1572-8757
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