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Title: CONTROL OF FE(III) SITE OCCUPANCY ON THE RATE AND EXTENT OF MICROBIAL REDUCTION OF FE(III) IN NONTRONITE

Abstract

A quantitative study was performed to understand how Fe(III) site occupancy controls Fe(III) bioreduction in nontronite by Shewanella putrefaciens CN32. NAu-1 and NAu-2 were nontronites and contained Fe(III) in different structure sites with 16% and 23% total iron (w/w), respectively, with almost all iron as Fe(III). Moessbauer spectroscopy showed that Fe(III) was present in the octahedral site in NAu-1 (with a small amount of goethite), but in both the tetrahedral and the octahedral sites in NAu-2. Moessbauer data further showed that the octahedral Fe(III) in NAu-2 existed in at least two environments- trans (M1) and cis (M2) sites. The microbial Fe(III) reduction in NAu-1 and NAu-2 was studied in batch cultures at a nontronite concentration of 5mg/mL in bicarbonate buffer with lactate as the electron donor. Fe(II) production in inoculated treatments was determined by extraction with 0.5 N HCl and compared to uninoculated controls to establish the extent of biological reduction. The resulting solids were characterized by X-ray diffraction (XRD), Moessbauer spectroscopy, and transmission electron microscopy (TEM). In the presence of an electron shuttle, anthraquinone-2,6-disulfonate (AQDS), the extent of bioreduction was 11-16% for NAu-1 but 28-32% for NAu-2. The extent of reduction in the absence of AQDS was only 5-7%more » in NAu-1 but 14-18% in NAu-2. The reduction rate was also faster in NAu-2 than that in NAu-1. Moessbauer data of the bioreduced nontronite materials indicated that the Fe(III) reduction in NAu-1 was mostly from the presence of goethite, whereas the reduction in NAu-2 was due to the presence of the tetrahedral and trans-octahedral Fe(III) in the structure. The measured aqueous Fe(II) was negligible [< 2.5% of the total biogenic Fe(II)]. As a result of bioreduction, the average nontronite particle thickness remained nearly the same (from 2.1 to 2.5 nm) for NAu-1, but decreased significantly from 6 to 3.5 nm for NAu-2 with a concomitant change in crystal size distribution. The decrease in crystal size suggests reductive dissolution of nontronite NAu-2, which was supported by aqueous solution chemistry (i.e., aqueous Si). These data suggest that the more extensive Fe(III) bioreduction in NAu-2 was due to the presence of the tetrahedral and the trans-octahedral Fe(III), which was presumed to be more reducible. The biogenic Fe(II) was not associated with biogenic solids such as siderite or green rust or in the aqueous solution. We infer that it may be either adsorbed onto surfaces of nontronite particles/bacteria and in the structure of nontronite. Furthermore, we have demonstrated that natural nontronite clays were capable of supporting cell growth even in non-growth medium, possibly due to presence of naturally existing nutrients in the nontronite clays. These results suggest that crystal chemical environment of Fe(III) is an important determinant in controlling the rate and extent of microbial reduction of Fe(III) in nontronite.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
876905
Report Number(s):
PNWD-SA-6882
Journal ID: ISSN 0016-7037; GCACAK; 3157; KP1303000; TRN: US200608%%203
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Geochimica et Cosmochimica Acta
Additional Journal Information:
Journal Volume: 69; Journal Issue: 23; Journal ID: ISSN 0016-7037
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; IRON COMPOUNDS; BIODEGRADATION; REDUCTION; CLAYS; BACTERIA; Environmental Molecular Sciences Laboratory

Citation Formats

Jaisi, Deb P, Kukkadapu, Ravi K, Eberl, Dennis D, and Dong, Hailiang. CONTROL OF FE(III) SITE OCCUPANCY ON THE RATE AND EXTENT OF MICROBIAL REDUCTION OF FE(III) IN NONTRONITE. United States: N. p., 2005. Web. doi:10.1016/j.gca.2005.07.008.
Jaisi, Deb P, Kukkadapu, Ravi K, Eberl, Dennis D, & Dong, Hailiang. CONTROL OF FE(III) SITE OCCUPANCY ON THE RATE AND EXTENT OF MICROBIAL REDUCTION OF FE(III) IN NONTRONITE. United States. https://doi.org/10.1016/j.gca.2005.07.008
Jaisi, Deb P, Kukkadapu, Ravi K, Eberl, Dennis D, and Dong, Hailiang. Thu . "CONTROL OF FE(III) SITE OCCUPANCY ON THE RATE AND EXTENT OF MICROBIAL REDUCTION OF FE(III) IN NONTRONITE". United States. https://doi.org/10.1016/j.gca.2005.07.008.
@article{osti_876905,
title = {CONTROL OF FE(III) SITE OCCUPANCY ON THE RATE AND EXTENT OF MICROBIAL REDUCTION OF FE(III) IN NONTRONITE},
author = {Jaisi, Deb P and Kukkadapu, Ravi K and Eberl, Dennis D and Dong, Hailiang},
abstractNote = {A quantitative study was performed to understand how Fe(III) site occupancy controls Fe(III) bioreduction in nontronite by Shewanella putrefaciens CN32. NAu-1 and NAu-2 were nontronites and contained Fe(III) in different structure sites with 16% and 23% total iron (w/w), respectively, with almost all iron as Fe(III). Moessbauer spectroscopy showed that Fe(III) was present in the octahedral site in NAu-1 (with a small amount of goethite), but in both the tetrahedral and the octahedral sites in NAu-2. Moessbauer data further showed that the octahedral Fe(III) in NAu-2 existed in at least two environments- trans (M1) and cis (M2) sites. The microbial Fe(III) reduction in NAu-1 and NAu-2 was studied in batch cultures at a nontronite concentration of 5mg/mL in bicarbonate buffer with lactate as the electron donor. Fe(II) production in inoculated treatments was determined by extraction with 0.5 N HCl and compared to uninoculated controls to establish the extent of biological reduction. The resulting solids were characterized by X-ray diffraction (XRD), Moessbauer spectroscopy, and transmission electron microscopy (TEM). In the presence of an electron shuttle, anthraquinone-2,6-disulfonate (AQDS), the extent of bioreduction was 11-16% for NAu-1 but 28-32% for NAu-2. The extent of reduction in the absence of AQDS was only 5-7% in NAu-1 but 14-18% in NAu-2. The reduction rate was also faster in NAu-2 than that in NAu-1. Moessbauer data of the bioreduced nontronite materials indicated that the Fe(III) reduction in NAu-1 was mostly from the presence of goethite, whereas the reduction in NAu-2 was due to the presence of the tetrahedral and trans-octahedral Fe(III) in the structure. The measured aqueous Fe(II) was negligible [< 2.5% of the total biogenic Fe(II)]. As a result of bioreduction, the average nontronite particle thickness remained nearly the same (from 2.1 to 2.5 nm) for NAu-1, but decreased significantly from 6 to 3.5 nm for NAu-2 with a concomitant change in crystal size distribution. The decrease in crystal size suggests reductive dissolution of nontronite NAu-2, which was supported by aqueous solution chemistry (i.e., aqueous Si). These data suggest that the more extensive Fe(III) bioreduction in NAu-2 was due to the presence of the tetrahedral and the trans-octahedral Fe(III), which was presumed to be more reducible. The biogenic Fe(II) was not associated with biogenic solids such as siderite or green rust or in the aqueous solution. We infer that it may be either adsorbed onto surfaces of nontronite particles/bacteria and in the structure of nontronite. Furthermore, we have demonstrated that natural nontronite clays were capable of supporting cell growth even in non-growth medium, possibly due to presence of naturally existing nutrients in the nontronite clays. These results suggest that crystal chemical environment of Fe(III) is an important determinant in controlling the rate and extent of microbial reduction of Fe(III) in nontronite.},
doi = {10.1016/j.gca.2005.07.008},
url = {https://www.osti.gov/biblio/876905}, journal = {Geochimica et Cosmochimica Acta},
issn = {0016-7037},
number = 23,
volume = 69,
place = {United States},
year = {2005},
month = {12}
}