2024-03-19T11:44:09Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/986852018-11-15T12:32:36Zcom_10261_84com_10261_5col_10261_337
2014-06-20T09:41:25Z
urn:hdl:10261/98685
Understanding phenol adsorption mechanisms on activated carbons
Fernández Velasco, Leticia
Ovín Ania, María Concepción
Activated carbon
Phenol
Physisorption
Chemisorption
The 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.
2014-06-20T09:41:25Z
2014-06-20T09:41:25Z
2011-02
artículo
Adsorption 17(1): 247-254 (2011)
0929-5607
http://hdl.handle.net/10261/98685
10.1007/s10450-011-9322-x
1572-8757
eng
Postprint
http://dx.doi.org/10.1007/s10450-011-9322-x
Sí
openAccess
Springer