Mechanisms of siderophore sorption to smectite and siderophore-enhanced release of structural Fe3+

被引:34
作者
Haack, Elizabeth A. [1 ]
Johnston, Cliff T. [2 ]
Maurice, Patricia A. [1 ]
机构
[1] Univ Notre Dame, Dept Civil Engn & Geol Sci, Notre Dame, IN 46556 USA
[2] Purdue Univ, W Lafayette, IN 47907 USA
基金
美国国家科学基金会; 加拿大自然科学与工程研究理事会;
关键词
D O I
10.1016/j.gca.2008.03.027
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Sorption of the trihydroxamate siderophores desferrioxamine-B and -D (DFOB and DFOD, respectively) and of the monohydroxamate ligand acetohydroxamic acid (aHA) to smectite were examined in batch sorption studies (pH 5.5, 0.1 M ionic strength) coupled with X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. Both DFOB and DFOD, which have similar molecular structures but different charge properties (cationic versus neutral, respectively) showed a high affinity for smectite. In contrast, the smaller aHA molecule did not sorb appreciably. XRD analysis indicated that DFOB and DFOD each absorbed in the interlamellar region of the clay to give d-spacings of 13.4-13.7 angstrom at equilibrium solution concentrations < 250 mu M. FTIR spectra of sorbed DFOB and DFOD indicated that the conformation of each species was distinct from its conformation in the crystalline or dissolved states. At elevated initial solution concentrations of 500-1500 mu M, DFOB formed a bilayer in the clay interlayer. Changes in the FTIR spectra of the DFOB-loaded clay samples at these higher surface loadings were consistent with the presence of a metal-siderophore complex in the interlayer. DFOB and DFOD both enhanced Fe and Al release from smectite, but aHA did not. Possible dissolution mechanisms are discussed in light of the FTIR and batch dissolution results. (C) 2008 Elsevier Ltd. All rights reserved.
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页码:3381 / 3397
页数:17
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