Surface chemistry of nanoporous carbon and the effect of pH on adsorption from aqueous phenol and 2,3,4-trichlorophenol solutions

K. László, E. Tombácz, Péter Kerepesi

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40 Citations (Scopus)

Abstract

Granular nanoporous activated carbon prepared from polyacrylonitrile (PAN) was investigated as a means of removing weak aromatic acids from aqueous solutions. This carbon is highly nanoporous, the BET surface area being 544m2/g with Vtot=0.278cm3/g, and V micro=0.266cm3/g. Aqueous treatment reduced the surface area to 364m2/g. Granular nanoporous carbon prepared from PAN contains O and N related surface functional groups. The surface concentration of both oxygen and nitrogen atoms was found by XPS to be 5.3%. Surface groups containing these hetero atoms are responsible for the acid-base character of this carbon in aqueous solutions. The pHPZC of the carbon is 8.4. The microporous pore network produces a wide hysteresis loop, observed when the granular carbon was studied by continuous titration. This loop, which was found to diminish, but not to disappear completely when the particle size was reduced, is attributed to irreversible hydrolysis of surface esters and/or lactones. The surface concentration of the functional groups titrated by the equilibrium Boehm method is 449.2μeq./g, of which 112.9μeq./g have acidic and 336.3μeq./g have basic character. Within the acidic species three subgroups, namely the regions pKaaa

Original languageEnglish
Pages (from-to)13-22
Number of pages10
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume230
Issue number1-3
DOIs
Publication statusPublished - Dec 10 2003

Fingerprint

Phenol
Surface chemistry
phenols
Phenols
Carbon
chemistry
Adsorption
adsorption
carbon
polyacrylonitrile
Polyacrylonitriles
Functional groups
equilibrium methods
aqueous solutions
Atoms
acids
Lactones
activated carbon
Hysteresis loops
subgroups

Keywords

  • Acid-base properties
  • Adsorption mechanism
  • Aromatic weak acid
  • Langmuir model
  • Polymer based carbon

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

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title = "Surface chemistry of nanoporous carbon and the effect of pH on adsorption from aqueous phenol and 2,3,4-trichlorophenol solutions",
abstract = "Granular nanoporous activated carbon prepared from polyacrylonitrile (PAN) was investigated as a means of removing weak aromatic acids from aqueous solutions. This carbon is highly nanoporous, the BET surface area being 544m2/g with Vtot=0.278cm3/g, and V micro=0.266cm3/g. Aqueous treatment reduced the surface area to 364m2/g. Granular nanoporous carbon prepared from PAN contains O and N related surface functional groups. The surface concentration of both oxygen and nitrogen atoms was found by XPS to be 5.3{\%}. Surface groups containing these hetero atoms are responsible for the acid-base character of this carbon in aqueous solutions. The pHPZC of the carbon is 8.4. The microporous pore network produces a wide hysteresis loop, observed when the granular carbon was studied by continuous titration. This loop, which was found to diminish, but not to disappear completely when the particle size was reduced, is attributed to irreversible hydrolysis of surface esters and/or lactones. The surface concentration of the functional groups titrated by the equilibrium Boehm method is 449.2μeq./g, of which 112.9μeq./g have acidic and 336.3μeq./g have basic character. Within the acidic species three subgroups, namely the regions pKaaa",
keywords = "Acid-base properties, Adsorption mechanism, Aromatic weak acid, Langmuir model, Polymer based carbon",
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T1 - Surface chemistry of nanoporous carbon and the effect of pH on adsorption from aqueous phenol and 2,3,4-trichlorophenol solutions

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AU - Tombácz, E.

AU - Kerepesi, Péter

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AB - Granular nanoporous activated carbon prepared from polyacrylonitrile (PAN) was investigated as a means of removing weak aromatic acids from aqueous solutions. This carbon is highly nanoporous, the BET surface area being 544m2/g with Vtot=0.278cm3/g, and V micro=0.266cm3/g. Aqueous treatment reduced the surface area to 364m2/g. Granular nanoporous carbon prepared from PAN contains O and N related surface functional groups. The surface concentration of both oxygen and nitrogen atoms was found by XPS to be 5.3%. Surface groups containing these hetero atoms are responsible for the acid-base character of this carbon in aqueous solutions. The pHPZC of the carbon is 8.4. The microporous pore network produces a wide hysteresis loop, observed when the granular carbon was studied by continuous titration. This loop, which was found to diminish, but not to disappear completely when the particle size was reduced, is attributed to irreversible hydrolysis of surface esters and/or lactones. The surface concentration of the functional groups titrated by the equilibrium Boehm method is 449.2μeq./g, of which 112.9μeq./g have acidic and 336.3μeq./g have basic character. Within the acidic species three subgroups, namely the regions pKaaa

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