Pb-Bearing Ferrihydrite Bioreduction and Secondary-Mineral Precipitation during Fe Redox Cycling
The significant accumulation of Pb from anthropogenic activities threatens environmental ecosystems. In the environment, iron oxides are one of the main carriers of Pb. Thus, the redox cycling of iron oxides, which is due to biotic and abiotic pathways, and which leads to their dissolution or transf...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-05-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/12/5/610 |
| _version_ | 1797497564441870336 |
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| author | Fatima Meite Mustapha Abdelmoula Patrick Billard Thomas Hauet Asfaw Zegeye |
| author_facet | Fatima Meite Mustapha Abdelmoula Patrick Billard Thomas Hauet Asfaw Zegeye |
| author_sort | Fatima Meite |
| collection | DOAJ |
| description | The significant accumulation of Pb from anthropogenic activities threatens environmental ecosystems. In the environment, iron oxides are one of the main carriers of Pb. Thus, the redox cycling of iron oxides, which is due to biotic and abiotic pathways, and which leads to their dissolution or transformation, controls the fate of Pb. However, a knowledge gap exists on the bioreduction in Pb-bearing ferrihydrites, secondary-mineral precipitation, and Pb partitioning during the bioreduction/oxidation/bioreduction cycle. In this study, Pb-bearing ferrihydrite (Fh_Pb) with various Pb/(Fe+Pb) molar ratios (i.e., 0, 2, and 5%) were incubated with the iron-reducing bacterium <i>Shewanella oneidensis</i> MR-1 for 7 days, oxidized for 7 days (atmospheric O<sub>2</sub>), and bioreduced a second time for 7 days. Pb doping led to a drop in the rate and the extent of the reduction. Lepidocrocite (23–56%) and goethite (44–77%) formed during the first reduction period. Magnetite (72–84%) formed during the second reduction. The extremely-low-dissolved and bioavailable Pb concentrations were measured during the redox cycles, which indicates that the Pb significantly sorbed onto the minerals that were formed. Overall, this study highlights the influence of Pb and redox cycling on the bioreduction of Pb-bearing iron oxides, as well as on the nature of the secondary minerals that are formed. |
| first_indexed | 2024-03-10T03:21:01Z |
| format | Article |
| id | doaj.art-539523a84a744f4eaf37c24582382396 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T03:21:01Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-539523a84a744f4eaf37c245823823962023-11-23T12:19:23ZengMDPI AGMinerals2075-163X2022-05-0112561010.3390/min12050610Pb-Bearing Ferrihydrite Bioreduction and Secondary-Mineral Precipitation during Fe Redox CyclingFatima Meite0Mustapha Abdelmoula1Patrick Billard2Thomas Hauet3Asfaw Zegeye4Université de Lorraine, CNRS, LIEC, F-54000 Nancy, FranceUniversité de Lorraine, CNRS, LCPME, F-54000 Nancy, FranceUniversité de Lorraine, CNRS, LIEC, F-54000 Nancy, FranceUniversité de Lorraine, CNRS, IJL, F-54000 Nancy, FranceUniversité de Lorraine, CNRS, LIEC, F-54000 Nancy, FranceThe significant accumulation of Pb from anthropogenic activities threatens environmental ecosystems. In the environment, iron oxides are one of the main carriers of Pb. Thus, the redox cycling of iron oxides, which is due to biotic and abiotic pathways, and which leads to their dissolution or transformation, controls the fate of Pb. However, a knowledge gap exists on the bioreduction in Pb-bearing ferrihydrites, secondary-mineral precipitation, and Pb partitioning during the bioreduction/oxidation/bioreduction cycle. In this study, Pb-bearing ferrihydrite (Fh_Pb) with various Pb/(Fe+Pb) molar ratios (i.e., 0, 2, and 5%) were incubated with the iron-reducing bacterium <i>Shewanella oneidensis</i> MR-1 for 7 days, oxidized for 7 days (atmospheric O<sub>2</sub>), and bioreduced a second time for 7 days. Pb doping led to a drop in the rate and the extent of the reduction. Lepidocrocite (23–56%) and goethite (44–77%) formed during the first reduction period. Magnetite (72–84%) formed during the second reduction. The extremely-low-dissolved and bioavailable Pb concentrations were measured during the redox cycles, which indicates that the Pb significantly sorbed onto the minerals that were formed. Overall, this study highlights the influence of Pb and redox cycling on the bioreduction of Pb-bearing iron oxides, as well as on the nature of the secondary minerals that are formed.https://www.mdpi.com/2075-163X/12/5/610Pb-bearing ferrihydritebioreductionabiotic oxidationlepidocrocitegoethitemagnetite |
| spellingShingle | Fatima Meite Mustapha Abdelmoula Patrick Billard Thomas Hauet Asfaw Zegeye Pb-Bearing Ferrihydrite Bioreduction and Secondary-Mineral Precipitation during Fe Redox Cycling Minerals Pb-bearing ferrihydrite bioreduction abiotic oxidation lepidocrocite goethite magnetite |
| title | Pb-Bearing Ferrihydrite Bioreduction and Secondary-Mineral Precipitation during Fe Redox Cycling |
| title_full | Pb-Bearing Ferrihydrite Bioreduction and Secondary-Mineral Precipitation during Fe Redox Cycling |
| title_fullStr | Pb-Bearing Ferrihydrite Bioreduction and Secondary-Mineral Precipitation during Fe Redox Cycling |
| title_full_unstemmed | Pb-Bearing Ferrihydrite Bioreduction and Secondary-Mineral Precipitation during Fe Redox Cycling |
| title_short | Pb-Bearing Ferrihydrite Bioreduction and Secondary-Mineral Precipitation during Fe Redox Cycling |
| title_sort | pb bearing ferrihydrite bioreduction and secondary mineral precipitation during fe redox cycling |
| topic | Pb-bearing ferrihydrite bioreduction abiotic oxidation lepidocrocite goethite magnetite |
| url | https://www.mdpi.com/2075-163X/12/5/610 |
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