Effect of sodium chloride on interactions of fulvic acid and fulvate with montmorillonite

E. Tombácz, Mária Gilde, Imre Ábrahám, Ferenc Szántó

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The interaction of montmorillonite and fulvic acid has been studied at various values of pH and 1 : 1 electrolyte concentrations. The fulvic acid was prepared from gallic acid by heterogeneous catalysis. The amounts adsorbed were determined from the decrease in solute concentration. The adsorption of fulvic acid on H-montmorillonite at pH of about 2.8 is higher than that of Na-fulvate on Na-montmorillonite at pH of about 7.5 in electrolyte-free systems. At low pH, a small amount of NaCl (10 or 20 mmol dm-3) had virtually the same effect on interaction as an amount of 200 or 500 mmol dm-3 at alkaline pH. The combined effect of the pH and NaCl was interpreted by calculating the surface charge, the potential, and the interaction energy of montmorillonite and humic substance particles by a simple model including the assumption of two widely different, intrinsic dissociation constants of the fulvic acid.

Original languageEnglish
Pages (from-to)101-112
Number of pages12
JournalApplied Clay Science
Volume5
Issue number2
DOIs
Publication statusPublished - 1990

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Bentonite
fulvic acid
sodium chloride
montmorillonite
Sodium Chloride
electrolyte
Electrolytes
Humic Substances
Gallic Acid
catalysis
Surface charge
humic substance
Catalysis
solute
adsorption
Adsorption
effect
acid
energy

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geology

Cite this

Effect of sodium chloride on interactions of fulvic acid and fulvate with montmorillonite. / Tombácz, E.; Gilde, Mária; Ábrahám, Imre; Szántó, Ferenc.

In: Applied Clay Science, Vol. 5, No. 2, 1990, p. 101-112.

Research output: Contribution to journalArticle

Tombácz, E. ; Gilde, Mária ; Ábrahám, Imre ; Szántó, Ferenc. / Effect of sodium chloride on interactions of fulvic acid and fulvate with montmorillonite. In: Applied Clay Science. 1990 ; Vol. 5, No. 2. pp. 101-112.
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