NDLI: Understanding phenol adsorption mechanisms on activated carbons

Content Provider	Springer Nature Link
Author	Velasco, Leticia F. Ania, Conchi O.
Copyright Year	2011
Abstract	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.
Starting Page	247
Ending Page	254
Page Count	8
File Format	PDF
ISSN	09295607
Journal	Adsorption
Volume Number	17
Issue Number	1
e-ISSN	15728757
Language	English
Publisher	Springer US
Publisher Date	2011-01-14
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Activated carbon Phenol Physisorption Chemisorption Engineering Thermodynamics, Heat and Mass Transfer Surfaces and Interfaces, Thin Films Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering Surfaces and Interfaces

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