Thermodynamics of adsorption at the aqueous-air interface

Risto Pajarre (Corresponding Author), Pertti Koukkari

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

A thermodynamic model is presented for the aqueous–air interface. For common organic solutes a relationship between the activity coefficients in the bulk solution and on the surface layer is deduced by using the concept of a surface monolayer. This relation has enabled development of an equation expressing the air–water surface adsorption coefficient as a function of bulk activity coefficients, surface tensions, molar volumes and vapour pressures of the adsorbing species. The data for 51 compounds, including alkanes, cycloalkanes, aromatics, halogenated hydrocarbons, alcohols, ethers and esters, and ketones were used in the study.
Original languageEnglish
Pages (from-to)39 - 45
Number of pages7
JournalJournal of Colloid and Interface Science
Volume337
Issue number1
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

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Keywords

  • Adsorption
  • Air-water interface
  • Monolayer model
  • Surface tension
  • Thermodynamic modeling

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