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Clays and Clay Minerals; December 2005; v. 53; no. 6; p. 557-563; DOI: 10.1346/CCMN.2005.0530601
© 2005 Clay Minerals Society
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EFFECTS OF SIDEROPHORES ON Pb AND Cd ADSORPTION TO KAOLINITE

Sarah E. Hepinstall, Benjamin F. Turner and Patricia A. Maurice*

Department of Civil Engineering & Geological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA



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  		Figure 1. Molecular structure of (a) aHA (siderophore-like monohydroxamate), (b) DFO-B (linear trihydroxamate), (c) DFO-D1 (linear trihydroxamate), and (d) DFO-E (cyclic trihydroxamate).

 


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  		Figure 2. (a) Recent Pb and Cd sorbed as a function of pH. (b) Pb (11.1 µM) adsorption envelope to kaolinite in the presence and absence of siderophores (240 µM). (c) Cd (11.1 µM) adsorption in the presence and absence of siderophores (240 µM). Here and in Figure 3Go, aHA = acetohydroxamic acid, DFOB = DFO-B, DFOD = DFO-D1 and DFOE = DFO-E (DFO is our abbreviation for desferrioxamine).

 


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  		Figure 3. Pb adsorption isotherms. (a) Pb (10–7 to 10–4.15 M) adsorption isotherm at pH 5 in the absence and presence of siderophores (240 µM). (b) Pb (10–7 to 10–4.15 M) adsorption isotherm at pH 6 in the absence and presence of siderophores (240 µM).

 


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  		Figure 4. Metal (11.1 µM) species distribution diagrams. (a) Pb speciation in the presence of aHA. (b) Pb speciation in the presence of DFO-B. (c) Cd speciation in the presence of aHA. (d) Cd speciation in the presence of DFO-B.

 




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