Comparison of the Effects of Hydroxamate Siderophores on Lead and Cadmium Adsorption to Kaolinite

Master's Thesis


Siderophores are Fe(III)-specific organic ligands biosynthesized by microbes in Fe-deficient environments. They also complex other metals, such as Pb and Cd, influencing metal mobility. This study compared the effects of siderophores desferrioxamine-B (DFO-B), desferrioxamine-D (DFO-D1), desferrioxamine-E (DFO-E), as well as siderophore-like ligand acetohydroxamic acid (aHA) on Pb and Cd (except for DFO-E) adsorption to kaolinite (KGa-1b) at pH 4.5 to 9, in 0.1 M NaClO4, at 22oC, in the dark. At pH > 6, all of the ligands inhibited Pb adsorption with inhibition increasing in the order aHA < DFO-D1 < DFO-B < DFO-E. At lower pH, the presence of DFO-B slightly enhanced Pb adsorption. These ligands also inhibited Cd adsorption at pH > 8, but had no effect at low pH. Modeling the systems with PHREEQC suggested that the siderophores in solution out-competed the kaolinite surface for the metal cations, thus causing decreased adsorption at high pH.


Attribute NameValues
  • etd-04132004-142711

Author Sarah Elizabeth Hepinstall
Advisor Patricia Maurice
Contributor Jeremy Fein, Committee Member
Contributor Patricia Maurice, Committee Chair
Contributor Peter Burns, Committee Member
Degree Level Master's Thesis
Degree Discipline Civil and Environmental Engineering and Earth Sciences
Degree Name MS
Defense Date
  • 2004-03-25

Submission Date 2004-04-13
  • United States of America

  • kaolinite

  • cadmium

  • siderophores

  • adsorption

  • lead

  • University of Notre Dame

  • English

Record Visibility and Access Public
Content License
  • All rights reserved

Departments and Units


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