Adsorption of salicylate on alumina surfaces

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Abstract

The adsorption of salicylic acid/salicylate on γ-AlOOH (Brockmann alumina, boehmite) and on γ-Al (OH)3 (alumina gel, bayerite) was investigated in aqueous electrolyte media. The results of the adsorption and electrokinetic experiments revealed that salicylate adsorption cannot be explained simply in terms of electrostatic interactions: other contributions also have to be taken into account. Application of an electrostatic model of surface speciation equilibria calculated using the program MINTEQA2 allowed a qualitative description of the behaviour of the system. The deviation from the experimental data was larger for the more soluble alumina gel. The observed trends were interpreted in that formation of inner-sphere surface complexes leads to disordering of the solid surface, newly-formed surfaces thereby becoming available for adsorption processes.

Original languageEnglish
Pages (from-to)319-325
Number of pages7
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume141
Issue number3
DOIs
Publication statusPublished - Nov 15 1998
EventProceedings of the 1996 7th Conference on Colloid Chemistry in Memoriam to A. Buzagh - Eger, Hung
Duration: Sep 23 1997Sep 26 1997

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Keywords

  • Adsorption
  • Alumina
  • Salicylate
  • Surface complex formation
  • Surface speciation equilibria
  • Weathering

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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