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A Comparison of the Sorption Reactivity of Bacteriogenic and Mycogenic Mn Oxide Nanoparticles

机译：致细菌性和致真菌性氧化锰纳米颗粒的吸附反应性比较

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摘要

Biogenic MnO_2 minerals affect metal fate and transport in natural and engineered systems by strongly sorbing metals ions. The ability to produce MnO_2 is widely dispersed in the microbial tree of life, leading to potential differences in the minerals produced by different organisms. In this study, we compare the structure and reactivity of biogenic Mn oxides produced by the biofilm-forming bacterium Pseudomonas putida GB-1 and the white-rot fungus Coprinellus sp. The rate of Mn(Ⅱ) oxidation, and thus biomineral production, was 45 times lower for Coprinellus sp. (5.1 × 10~(-2) mM d~(-1)) than for P. putida (2.32 mM d~(-1)). Both organisms produced predominantly Mn(Ⅳ) oxides with hexagonal-sheet symmetry, low sheet stacking, small particle size, and Mn(Ⅱ/Ⅲ) in the interlayer. However, we found that mycogenic MnO_2 could support a significantly lower quantity of Ni sorbed via inner-sphere coordination at vacancy sites than the bacteriogenic MnO_2: 0.09 versus 0.14 mol Ni mol~(-1) Mn. In addition, 50- 100% of the adsorbed Ni partitioned to the MnO_2, which accounts for less than 20% of the sorbent on a mass basis. The vacancy content, which appears to increase with the kinetics of MnO_2 precipitation, exerts significant control on biomineral reactivity.
机译：生物MnO_2矿物通过强烈吸收金属离子来影响金属命运以及在自然和工程系统中的运输。产生MnO_2的能力广泛分布在生命的微生物树中，导致不同生物产生的矿物质之间存在潜在差异。在这项研究中，我们比较了由生物膜形成细菌恶臭假单胞菌GB-1和白腐真菌Coprinellus sp产生的生物锰氧化物的结构和反应性。 Coprinellus sp。的Mn（Ⅱ）氧化速率和生物矿产降低了45倍。 （5.1×10〜（-2）mM d〜（-1））比恶臭假单胞菌（2.32 mM d〜（-1））高。两种生物均主要产生具有六边形薄片对称性，低薄片堆积，小粒径和中间层中Mn（Ⅱ/Ⅲ）的Mn（Ⅳ）氧化物。然而，我们发现致真菌的MnO_2可以支持空位处通过内球配位吸附的Ni量要比细菌生成的MnO_2的要低得多：0.09对0.14 mol Ni mol〜（-1）Mn。另外，被吸附的Ni的50-100％分配到MnO 2，按质量计，其少于吸附剂的20％。空缺含量似乎随着MnO_2沉淀动力学的增加而增加，对生物矿物的反应性具有重要的控制作用。

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  • 来源
    《Environmental Science & Technology》 |2015年第7期|4200-4208|共9页
  • 作者

    Boris Droz; Naomi Dumas; Owen W. Duckworth; Jasquelin Pena;

  • 作者单位

    Institute of Earth Surface Dynamics, University of Lausanne, Lausanne, Switzerland, 1015,Department of Soil Science, North Carolina State University, Raleigh, North Carolina 27695-7619, United States;

    Institute of Earth Surface Dynamics, University of Lausanne, Lausanne, Switzerland, 1015;

    Department of Soil Science, North Carolina State University, Raleigh, North Carolina 27695-7619, United States;

    Institute of Earth Surface Dynamics, University of Lausanne, Lausanne, Switzerland, 1015;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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