A key parameter on the adsorption of diluted aniline solutions with activated carbons: The surface oxygen content

Beatrice Pardo, Nabí Ferrer, Julià Sempere, Rafael Gonzalez-Olmos

Research output: Indexed journal article Articlepeer-review

16 Citations (Scopus)

Abstract

A total of 11 different commercial activated carbons (AC) with well characterized textural properties and oxygen surface content were tested as adsorbents for the removal of aniline as a target water pollutant. The maximum adsorption capacity of aniline for the studied AC was from 138.9 to 257.9 mg g−1 at 296.15 K and it was observed to be strongly related to the textural properties of the AC, mainly with the BET surface area and the micropore volume. It was not observed any influence of the oxygen surface content of the AC on the maximum adsorption capacity. However, it was found that at low aniline aqueous concentration, the presence of oxygen surface groups plays a dominant role during the adsorption. A high concentration of oxygen surface groups, mainly carboxylic and phenolic groups, decreases the aniline adsorption regardless of the surface area of the AC.

Original languageEnglish
Pages (from-to)181-188
Number of pages8
JournalChemosphere
Volume162
DOIs
Publication statusPublished - 1 Nov 2016

Keywords

  • Activated carbon
  • Adsorption
  • Adsorption isotherm
  • Aniline
  • Surface characterization

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