碳酸盐矿物和异化铁还原生物在 CO2 浓度升高的情况下引发协同的非生物和生物链反应,Environmental Science & Technology

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碳酸盐矿物和异化铁还原生物在 CO2 浓度升高的情况下引发协同的非生物和生物链反应
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-10-27 , DOI: 10.1021/acs.est.2c03843
Shuyi Li ₁ , Qi Feng ₁ , Juan Liu ₂ , Yu He ₁ , Liang Shi _{1,

3,

4} , Maxim I Boyanov _{5,

6} , Edward J O'Loughlin ₅ , Kenneth M Kemner ₅ , Robert A Sanford ₇ , Hongbo Shao ₈ , Xiao He _{9,

10} , Anxu Sheng ₂ , Hang Cheng ₂ , Chunhua Shen ₁₁ , Wenmao Tu ₁₂ , Yiran Dong _{1,

3,

4,

13,

14}

Affiliation

School of Environmental Studies, China University of Geosciences (Wuhan), Wuhan430074, China.
Department of Environmental Engineering, Peking University, Beijing100871, China.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan430074, China.
State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution, Ministry of Ecology and Environment, Wuhan430074, China.
Biosciences Division, Argonne National Laboratory, Lemont, Illinois60439, United States.
Institute of Chemical Engineering, Bulgarian Academy of Sciences, Sofia1113, Bulgaria.
Department of Geology, University of Illinois Urbana-Champaign, Champaign, Illinois60801, United States.
Illinois State Geological Survey, Champaign, Illinois61820, United States.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing100049, China.
University of Chinese Academy of Sciences, Beijing100049, China.
Center for Materials Research and Analysis, Wuhan University of Technology, Wuhan430070, China.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan430070, China.
Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, China University of Geosciences (Wuhan), Wuhan430074, China.
Hubei Key Laboratory of Wetland Evolution & Ecological Restoration, China University of Geosciences (Wuhan), Wuhan430074, China.

CO ₂排放量的增加导致了紧迫的气候和环境问题。_{虽然已经分别研究了介导 CO 2}命运的非生物和生物过程，但对它们的相互作用和综合影响知之甚少。为了探索这一知识缺口，在 18 种条件下培养了一种铁还原生物Orenia metallireducens ，这些条件在顶空 CO ₂浓度、氧化铁负载和白云石 (CaMg(CO ₃ ) ₂ ) 可用性方面有系统地变化。结果表明，非生物和生物过程交互调节 CO ₂通过“链式反应”进行酸化和封存，其中 pH 值是主要变量。具体而言，白云石减轻了 CO ₂对微生物活动的压力，可能是通过 pH 控制将抑制性 CO ₂转化为更温和的碳酸氢盐物质。^{微生物铁还原通过铁还原过程中质子 (H +} ) 消耗与有机底物氧化产生的H ⁺之间的竞争进一步影响 pH 值。在富含 Fe(III) 的条件下，微生物铁还原会增加 pH 值，促使溶解的 CO ₂形成碳酸氢盐。光谱和显微分析表明在升高的 CO ₂下菱铁矿 (FeCO _{3 ) 的形成增强}, 支持将其合并到固体中。这些 CO _{2 - 微生物 - 矿物实验的结果提供了对减轻 CO}₂酸化并有利于其封存的协同非生物和生物过程的见解，这对实际应用具有指导意义（例如，酸化修复、CO ₂封存和模拟碳通量）。

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Carbonate Minerals and Dissimilatory Iron-Reducing Organisms Trigger Synergistic Abiotic and Biotic Chain Reactions under Elevated CO2 Concentration

Increasing CO₂ emission has resulted in pressing climate and environmental issues. While abiotic and biotic processes mediating the fate of CO₂ have been studied separately, their interactions and combined effects have been poorly understood. To explore this knowledge gap, an iron-reducing organism, Orenia metallireducens, was cultured under 18 conditions that systematically varied in headspace CO₂ concentrations, ferric oxide loading, and dolomite (CaMg(CO₃)₂) availability. The results showed that abiotic and biotic processes interactively mediate CO₂ acidification and sequestration through “chain reactions”, with pH being the dominant variable. Specifically, dolomite alleviated CO₂ stress on microbial activity, possibly via pH control that transforms the inhibitory CO₂ to the more benign bicarbonate species. The microbial iron reduction further impacted pH via the competition between proton (H⁺) consumption during iron reduction and H⁺ generation from oxidization of the organic substrate. Under Fe(III)-rich conditions, microbial iron reduction increased pH, driving dissolved CO₂ to form bicarbonate. Spectroscopic and microscopic analyses showed enhanced formation of siderite (FeCO₃) under elevated CO₂, supporting its incorporation into solids. The results of these CO₂–microbe–mineral experiments provide insights into the synergistic abiotic and biotic processes that alleviate CO₂ acidification and favor its sequestration, which can be instructive for practical applications (e.g., acidification remediation, CO₂ sequestration, and modeling of carbon flux).

更新日期：2022-10-27

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