摘要详情
238 / 2025-04-15 17:23:04
Synergistic CO2 sequestration by dissimilatory iron-reducing organisms and different natural minerals
iron-reducing organisms,CO2 sequestration,natural minerals,CO2acidification,abiotic and biotic processes
摘要待审
The increase in carbon dioxide (CO2) concentrations caused by human activities, leading to environmental and climate changes, has garnered widespread global attention. The lithosphere is the largest inorganic carbon reservoir in nature. When subjected to environmental acidification resulting from elevated atmospheric CO₂ concentrations, significant variations emerge in the reaction kinetics, extent, and products among different mineral phases, microbial communities, and CO₂. These variations could directly or indirectly affect the distribution and stability of CO2 at the solid-liquid-gas interface. However, there is currently a lack of a systematic understanding of the mechanisms by which microorganisms regulate CO2 fate when coexisting with different natural minerals.
To understand the principles and mechanisms by which iron-reducing microorganisms regulate CO2 sequestration in coexistence with different natural minerals, this study employed glass beads (SiO2) as controls and selected widely distributed natural minerals, calcite (CaCO3) and wollastonite (CaSiO3), as representative minerals, with the widely distributed iron-reducing microorganism Orenia metallireducens strain Z6 (strain Z6) as the model organism. We investigated microbial growth and metabolic capacity during coexistence with different minerals under environmentally acidified conditions induced by varying CO2 concentrations (0-100% v/v), their feedback effects on the aqueous geochemical conditions, and the effects and mechanisms of CO2 transformation across different interfaces. The results show that:
The multimodal evidence presented in this study indicate that under mineral-microbe coexistence, the types of natural minerals influence the migration, transformation, and speciation of CO2 at the water-gas-liquid interface. This work provides a theoretical foundation for understanding the interactions and mechanistic controls between mineral-microbe synergies in both biotic and abiotic carbon sequestration processes. It further offers novel perspectives and methodologies for deciphering lithospheric carbon fluxes, stability, and cross-interface partitioning.
To understand the principles and mechanisms by which iron-reducing microorganisms regulate CO2 sequestration in coexistence with different natural minerals, this study employed glass beads (SiO2) as controls and selected widely distributed natural minerals, calcite (CaCO3) and wollastonite (CaSiO3), as representative minerals, with the widely distributed iron-reducing microorganism Orenia metallireducens strain Z6 (strain Z6) as the model organism. We investigated microbial growth and metabolic capacity during coexistence with different minerals under environmentally acidified conditions induced by varying CO2 concentrations (0-100% v/v), their feedback effects on the aqueous geochemical conditions, and the effects and mechanisms of CO2 transformation across different interfaces. The results show that:
- The acid neutralizing capacity (ANC) of the three minerals follows the trend: calcite > wollastonite > glass beads. As the CO2 concentration increases, the lag phase of strain Z6 growth is prolonged. The glass beads, with the weakest buffering capacity, failed to mitigate the environmental stress induced by elevated CO2 concentrations, resulting in complete inhibition of iron-reducing activity in 100% CO2 condition. whereas the other minerals showed varying degrees of promotional effects on strain Z6 activity. Compared to glass beads and calcite, wollastonite demonstrated the most significant chemical reaction with CO2, yet supported the lowest iron-reduction activity by Strain Z6.
- With increasing CO2 concentrations, the aqueous chemistry became more acidic, due to differences in the ANC of the three minerals, they reacted with media acidified by different concentrations of CO2, resulting in pH trends of wollastonite > calcite > glass beads. Intriguingly, under biotic conditions with glass beads or calcite, the pH gradually increased over time with biological activity. However, under wollastonite-amended biotic conditions, pH displayed the opposite trend, decreasing progressively over time.
- XRD, SEM, and XAFS analyses revealed that microbial iron reduction produced various Fe(II)-bearing secondary minerals (e.g., vivianite, siderite, hematite, green rust). The types and combinations of these secondary minerals were influenced by coexisting natural minerals, microbial iron metabolic activity, and aqueous geochemical conditions. Under wollastonite-amended conditions, the elevated pH partially suppressed microbial heterotrophic iron reduction, while the mineral preferentially reacted with dissolved CO2 (H2CO3) to form CaCO3, resulting in lower Fe-bearing secondary mineral formation. In contrast, under calcite- and glass bead-amended conditions, Fe-bearing secondary mineral formation was more favorable.
The multimodal evidence presented in this study indicate that under mineral-microbe coexistence, the types of natural minerals influence the migration, transformation, and speciation of CO2 at the water-gas-liquid interface. This work provides a theoretical foundation for understanding the interactions and mechanistic controls between mineral-microbe synergies in both biotic and abiotic carbon sequestration processes. It further offers novel perspectives and methodologies for deciphering lithospheric carbon fluxes, stability, and cross-interface partitioning.
重要日期
-
会议日期
06月10日
2025
至06月13日
2025
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04月15日 2025
初稿截稿日期
主办单位
National Natural Science Foundation of China
Geobiology Society
National Committee of Stratigraphy of China
Ministry of Science and Technology
Geological Society of China
Paleontological Society of China
Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences (CAS)
Institute of Vertebrate Paleontology and Paleoanthropology, CAS
International Commission on Stratigraphy
International Paleontological Association
Geobiology Society
National Committee of Stratigraphy of China
Ministry of Science and Technology
Geological Society of China
Paleontological Society of China
Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences (CAS)
Institute of Vertebrate Paleontology and Paleoanthropology, CAS
International Commission on Stratigraphy
International Paleontological Association
承办单位
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (CUG, Wuhan)
联系方式
- Yizhou Huang
- yi******@cug.edu.cn
- 186********
历届会议
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2025年06月10日 中国 Wuhan
第五届国际地球生物学会议 -
2017年06月24日 中国 Wuhan,China
The 4th International Conference of Geobiology
