Particle aggregation in complex aquatic systems

Research output: Contribution to journalConference article

66 Citations (Scopus)

Abstract

The influence of humate, gallate and salicylate on the surface charge character and particle aggregation of permanently and/or conditionally charged clay and oxide minerals (montmorillonite, kaolinite and aluminium-oxide) was investigated at pH7-8 in the presence of an indifferent electrolyte. pH-dependent surface charging of minerals were determined by acid-base titration. The pH- and ionic strength dependent particle aggregation was measured in both the absence and presence of organic anions by means of dynamic light scattering (DLS). Relatively small amount of organic anions, less than one species per nm2, adsorbed on the Al-OH surface sites of minerals induces a significant increase in the colloidal stability of dilute suspensions. Bound organic anions smear out the heterogeneity of surface charge and the differences between the clay and oxide minerals. Copyright (C) 1999 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)233-244
Number of pages12
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume151
Issue number1-2
DOIs
Publication statusPublished - Jun 15 1999
EventProceedings of the 1997 International Conference on Interfaces against Pollution - Wageningen, Neth
Duration: Aug 10 1997Aug 13 1997

Keywords

  • Adsorption
  • Aluminium-oxide
  • Dynamic light scattering (DLS)
  • Humic acid
  • Kaolinite
  • Montmorillonite
  • Particle aggregation
  • Surface charge
  • Surface modification

ASJC Scopus subject areas

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

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