Adsorption of organic acids on magnetite nanoparticles, pH-dependent colloidal stability and salt tolerance

E. Tombácz, I. Y. Tóth, D. Nesztor, E. Illés, A. Hajdú, M. Szekeres, L.Vékás

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

The adsorption of different organic acids and their influence on the pH-dependent charging, salt tolerance and so the colloidal stability of magnetite nanoparticles are compared. Adsorption isotherms of citric acid - CA, gallic acid - GA, poly(acrylic acid) - PAA, poly(acrylic-co-maleic acid) - PAM and humic acid - HA were measured. The pH-dependent charge state of MNPs was characterized by electrophoretic mobility and their aggregation by dynamic light scattering. The salt tolerance was tested in coagulation kinetic experiments. Although the adsorption capacities, the type of bonding (either H-bonds or metal ion-carboxylate complexes) and so the bond strengths are significantly different, the following general trends have been found. Small amount of organic acids at pH.

Original languageEnglish
Pages (from-to)91-96
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume435
DOIs
Publication statusPublished - Oct 2013

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Magnetite Nanoparticles
Magnetite nanoparticles
carbopol 940
Organic acids
magnetite
Salts
salts
Humic Substances
Adsorption
Electrophoretic mobility
nanoparticles
Pulse amplitude modulation
Gallic Acid
acids
Acrylics
adsorption
Acids
Dynamic light scattering
Coagulation
Adsorption isotherms

Keywords

  • Adsorption
  • Carboxylated magnetite nanoparticles
  • Nanoparticle stabilization
  • Overcharging
  • Small and macromolecular organic polyacids

ASJC Scopus subject areas

  • Colloid and Surface Chemistry

Cite this

Adsorption of organic acids on magnetite nanoparticles, pH-dependent colloidal stability and salt tolerance. / Tombácz, E.; Tóth, I. Y.; Nesztor, D.; Illés, E.; Hajdú, A.; Szekeres, M.; L.Vékás.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 435, 10.2013, p. 91-96.

Research output: Contribution to journalArticle

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