Surface properties and aggregation of basic aluminium chloride hydrolysis products

I. M. Solomentseva, N. G. Gerasimenko, S. Bárány

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The influence of major variables (working solution concentration, salt dosage, pH, ionic strength of the solution) on the electrokinetic potential, degree of hydration and aggregation of products of hydrolysis of basic aluminium chlorides (BAC) during water purification has been studied. The degree of hydration characterised by the spin-lattice relaxation time of the protons of adsorbed water increases with increasing basicity ([OH]/[Al] ratio) of coagulants, pH value and with decreasing the dose of salts and the concentration of their working solutions; this is reflected in the change of the ζ-potential of particles. It is shown that an increase of water pH and alkalinity, as well as decrease of BAC basicity lead to the formation of primary particles of a larger diameter (3.1-8.7 nm) whose surface area sharply reduces in the first minutes of aggregate formation. The latter is explained by different size-to-density properties (measured by laser diagnostic method) when varying the conditions of their formation. Aggregation of BAC hydrolysis product particles occurs in a discrete way; aggregates of higher orders are formed not from primary particles but from the first-order aggregates. An increase in basicity of BAC specimens leads to formation of more polydisperse and larger aggregates. The role of electrostatic and hydration factors in the mechanism of aggregation of ABC hydrolysis products is discussed. Copyright (C) 1999 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)113-126
Number of pages14
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume151
Issue number1-2
DOIs
Publication statusPublished - Jun 15 1999

Fingerprint

aluminum chlorides
Aluminum chloride
Alkalinity
surface properties
Surface properties
hydrolysis
Hydrolysis
Agglomeration
Hydration
hydration
products
Water
Salts
Laser diagnostics
salts
alkalinity
dosage
Coagulants
water treatment
Spin-lattice relaxation

Keywords

  • Aggregation
  • Basic aluminium chloride
  • Electrokinetic potential
  • Hydration
  • Hydrolysis
  • Size and density of aggregates
  • Water treatment

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Surface properties and aggregation of basic aluminium chloride hydrolysis products. / Solomentseva, I. M.; Gerasimenko, N. G.; Bárány, S.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 151, No. 1-2, 15.06.1999, p. 113-126.

Research output: Contribution to journalArticle

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