Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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Metal Reduction and Mineral formation by fe(III)-Reducing Bacteria Isolated from Extreme Environments

철환원 박테리아에 의한 금속 환원 및 광물형성

  • Yul Roh (Environmental Sciences Division, Oak Ridge National Laboratory) ;
  • Hi-Soo Moon (Department of earth system Sciences, Yonsei University) ;
  • Yungoo Song (Department of earth system Sciences, Yonsei University)
  • Published : 2002.09.01
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Abstract

Microbial metal reduction influences the biogeochemical cycles of carbon and metals as well as plays an important role in the bioremediation of metals, radionuclides, and organic contaminants. The use of bacteria to facilitate the production of magnetite nanoparticles and the formation of carbonate minerals may provide new biotechnological processes for material synthesis and carbon sequestration. Metal-reducing bacteria were isolated from a variety of extreme environments, such as deep terrestrial subsurface, deep marine sediments, water near Hydrothemal vents, and alkaline ponds. Metal-reducing bacteria isolated from diverse extreme environments were able to reduce Fe(III), Mn(IV), Cr(VI), Co(III), and U(VI) using short chain fatty acids and/or hydrogen as the electron donors. These bacteria exhibited diverse mineral precipitation capabilities including the formation of magnetite ($Fe_3$$O_4$), siderite ($FeCO_3$), calcite ($CaCO_3$), rhodochrosite ($MnCO_3$), vivianite [$Fe_3$($PO_4$)$_2$ .$8H_2$O], and uraninite ($UO_2$). Geochemical and environmental factors such as atmospheres, chemical milieu, and species of bacteria affected the extent of Fe(III)-reduction as well as the mineralogy and morphology of the crystalline iron mineral phases. Thermophilic bacteria use amorphous Fe(III)-oxyhydroxide plus metals (Co, Cr, Ni) as an electron acceptor and organic carbon as an electron donor to synthesize metal-substituted magnetite. Metal reducing bacteria were capable of $CO_2$conversion Into sparingly soluble carbonate minerals, such as siderite and calcite using amorphous Fe(III)-oxyhydroxide or metal-rich fly ash. These results indicate that microbial Fe(III)-reduction may not only play important roles in iron and carbon biogeochemistry in natural environments, but also be potentially useful f3r the synthesis of submicron-sized ferromagnetic materials.

미생물에 의한 금속이온의 환원은 탄소와 금속의 생지화학적 순환에 영향을 줄 뿐만 아니라 또한 금속, 방사성원소, 그리고 유기물로 오염된 지하수와 토양의 정화에 있어서 중요한 역할 가능성을 시사하고 있다. 지구의 극한 환경(예: 심해저 퇴적, 알칼리성 호수 등)에서 서식하는 철환원 박테리아를 분리하여 금속이온의 환원과 광물 형성 등의 실험에 이용하여 본 결과에 의하면, 이들 철환원 박테리아는 Fe(III), Mn(IV), Cr(VI), Co(III), and U(VI)이온 등을 환원시킬 뿐만 아니라, 자철석($Fe_3$$O_4$), 능철석($FeCO_3$), 방해석($CaCO_3$), 능망간석($MnCO_3$), 비비아나이트 [$Fe_3$($PO_4$)$_2$ .$8H_2$O], 우라니나이트(UO) 등의 광물을 형성한다. 철 환원 박테리아에 의한 광물 형성과 금속이온의 환원에 영향을 미치는 주요소는 대기의 조성, 화학 조성, 및 박테리아의 종이다. 호열성 철환원 박테리아는 철수화물과 금속이온(Co, Cr, Ni) 등을 동시에 환원시켜 금속 치환된 자철석을 합성하며, 또한 석탄회 등을 이용하여 탄산염 광물을 형성하여 대기 중의 이산화탄소를 고정하는 역할을 하기도 한다. 따라서 미생물에 의한 금속이온이 환원은 자연계에서 철과 탄소의 지화학적인 순환에 영향 미치며, 또한 미생물에 의한 자철석의 합성은 산업적으로 많은 이용가치가 있을 것으로 본다.

Keywords

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