Surface characterization of polyethyleneterephthalate (PET) based activated carbon and the effect of pH on its adsorption capacity from aqueous phenol and 2,3,4-trichlorophenol solutions

K. László, András Szucs

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

A predominantly microporous activated carbon produced from polyethyleneterephthalate (PET) by physical activation (burn-off 50%) has a BET surface area of 1170 m2/g and a total pore volume of 0.625 cm3/g. Its surface possesses an amphoteric nature due to the oxygen functionalities present, however, the majority of the groups are basic. The adsorption of phenol and 2,3,4-trichlorophenol has been studied from aqueous solution of different pH (pH=3, 11 and unbuffered) on this carbon. The adsorption mechanism depends both on the pH of the solutions and the pKa of the phenols, as the former influences the surface chemistry of the carbon as well. In the case of the phenol, a competitive adsorption takes place, as the interactions are weak in all three media investigated. The triple chlorine substitution in the 2,3,4-trichlorophenol significantly increases the strength of the interactions in comparison with phenol. Due to its smaller pKa value, in unbuffered medium io nic interaction occurs, as has been concluded from the shape of the isotherm and the outstandingly high value of the adsorption equilibrium constant. Competitive adsorption takes place only in the basic media, where the adsorption of the 2,3,4-trichlorophenol is hindered by electrostatic repulsion.

Original languageEnglish
Pages (from-to)1945-1953
Number of pages9
JournalCarbon
Volume39
Issue number13
DOIs
Publication statusPublished - 2001

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Phenol
Activated carbon
Phenols
Adsorption
Carbon
Chlorine
Equilibrium constants
Surface chemistry
Isotherms
2,3,4-trichlorophenol
Electrostatics
Substitution reactions
Chemical activation
Oxygen

Keywords

  • A. activated carbon
  • C. adsorption
  • D. functional groups
  • Surface properties
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

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title = "Surface characterization of polyethyleneterephthalate (PET) based activated carbon and the effect of pH on its adsorption capacity from aqueous phenol and 2,3,4-trichlorophenol solutions",
abstract = "A predominantly microporous activated carbon produced from polyethyleneterephthalate (PET) by physical activation (burn-off 50{\%}) has a BET surface area of 1170 m2/g and a total pore volume of 0.625 cm3/g. Its surface possesses an amphoteric nature due to the oxygen functionalities present, however, the majority of the groups are basic. The adsorption of phenol and 2,3,4-trichlorophenol has been studied from aqueous solution of different pH (pH=3, 11 and unbuffered) on this carbon. The adsorption mechanism depends both on the pH of the solutions and the pKa of the phenols, as the former influences the surface chemistry of the carbon as well. In the case of the phenol, a competitive adsorption takes place, as the interactions are weak in all three media investigated. The triple chlorine substitution in the 2,3,4-trichlorophenol significantly increases the strength of the interactions in comparison with phenol. Due to its smaller pKa value, in unbuffered medium io nic interaction occurs, as has been concluded from the shape of the isotherm and the outstandingly high value of the adsorption equilibrium constant. Competitive adsorption takes place only in the basic media, where the adsorption of the 2,3,4-trichlorophenol is hindered by electrostatic repulsion.",
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author = "K. L{\'a}szl{\'o} and Andr{\'a}s Szucs",
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AU - László, K.

AU - Szucs, András

PY - 2001

Y1 - 2001

N2 - A predominantly microporous activated carbon produced from polyethyleneterephthalate (PET) by physical activation (burn-off 50%) has a BET surface area of 1170 m2/g and a total pore volume of 0.625 cm3/g. Its surface possesses an amphoteric nature due to the oxygen functionalities present, however, the majority of the groups are basic. The adsorption of phenol and 2,3,4-trichlorophenol has been studied from aqueous solution of different pH (pH=3, 11 and unbuffered) on this carbon. The adsorption mechanism depends both on the pH of the solutions and the pKa of the phenols, as the former influences the surface chemistry of the carbon as well. In the case of the phenol, a competitive adsorption takes place, as the interactions are weak in all three media investigated. The triple chlorine substitution in the 2,3,4-trichlorophenol significantly increases the strength of the interactions in comparison with phenol. Due to its smaller pKa value, in unbuffered medium io nic interaction occurs, as has been concluded from the shape of the isotherm and the outstandingly high value of the adsorption equilibrium constant. Competitive adsorption takes place only in the basic media, where the adsorption of the 2,3,4-trichlorophenol is hindered by electrostatic repulsion.

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