Effect of salt on the mechanism of adsorption of aromatics on activated carbon

Hassan A. Arafat, Marcus Franz, Neville G. Pinto

Research output: Contribution to journalArticlepeer-review

122 Scopus citations

Abstract

The effect of KCl on the adsorption of phenol, toluene, and benzene on activated carbon, with different degrees of surface oxygenation, was investigated. Different trends of salt effect were observed for each compound. The observed KCl effects were interpreted on the basis of electrical charge neutralization on the carbon surface and the adsorbate molecules, water adsorption, and the 'salt out' effect. In particular, water adsorption was found to be crucial in reducing the adsorption capacity of the activated carbon. The influence of water adsorption was more pronounced on carbon surfaces with higher amounts of oxygen-containing groups. This was additionally confirmed by measurements using flow microcalorimetry.

Original languageBritish English
Pages (from-to)5997-6003
Number of pages7
JournalLangmuir
Volume15
Issue number18
DOIs
StatePublished - 1 Jan 1999

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