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首页> 外文期刊>Environmental Science & Technology >Interaction of Inorganic Arsenic with Biogenic Manganese Oxide Produced by a Mn-Oxidizing Fungus, Strain KR21-2
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Interaction of Inorganic Arsenic with Biogenic Manganese Oxide Produced by a Mn-Oxidizing Fungus, Strain KR21-2

机译：无机砷与锰氧化真菌KR21-2产生的生物锰氧化物的相互作用

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In batch culture experiments we examined oxidation of As(III) and adsorption of As(III/V) by biogenic manganese oxide formed by a manganese oxide-depositing fungus, strain KR21 -2. We expected to gain insight into the applicability of Mn-depositing microorganisms for biological treatment of As-contaminated waters. In cultures containing Mn{sup}(2+) and As(V), the solid Mn phase was rich in bound Mn{sup}(2+) (molar ratio, ～30%) and showed a transiently high accumulation of As(V) during the early stage of manganese oxide formation. As manganese oxide formation progressed, a large proportion of adsorbed As(V) was subsequently released. The high proportion of bound Mn{sup}(2+) may suppress a charge repulsion between As(V) and the manganese oxide surface, which has structural negative charges, promoting complex formation. In cultures containing Mn{sup}(2+) and As(III), As(III) started to be oxidized to As(V) after manganese oxide formation was mostly completed. In suspensions of the biogenic manganese oxides with dissolved Mn{sup}(2+), As(III) oxidation rates decreased with increasing dissolved Mn{sup}(2+). These results indicate that biogenic manganese oxide with a high proportion of bound Mn{sup}(2+) oxidizes As(III) less effectively than with a low proportion of bound Mn{sup}(2+). Coexisting Zn{sup}(2+), Ni{sup}(2+), and Co{sup}(2+) also showed similar effects to different extents. The present study demonstrates characteristic features of oxidation and adsorption of As by biogenic manganese oxides and suggests possibilities of developing a microbial treatment system for water contaminated with As that is suited to the actual situation of contamination.
机译：在分批培养实验中，我们研究了由氧化锰沉积真菌KR21 -2形成的生物成因氧化锰对As（III）的氧化和As（III / V）的吸附。我们希望深入了解锰沉积微生物在被As污染水域进行生物处理中的适用性。在含有Mn {sup}（2+）和As（V）的培养物中，固态Mn相富含结合的Mn {sup}（2 +）（摩尔比，〜30％），并显示出瞬时高浓度的As（ V）在氧化锰形成的早期。随着氧化锰形成的进行，随后释放出大部分吸附的As（V）。高比例的结合Mn {sup}（2+）可能会抑制As（V）与具有结构负电荷的锰氧化物表面之间的电荷排斥，从而促进复合物的形成。在含有Mn {sup}（2+）和As（III）的培养物中，大部分氧化锰形成完成后，As（III）开始被氧化为As（V）。在具有溶解的Mn {sup}（2+）的生物锰氧化物的悬浮液中，As（III）的氧化速率随溶解的Mn {sup}（2+）的增加而降低。这些结果表明，具有高比例的结合的Mn {sup}（2+）的生物型锰氧化物的氧化效率较低。 Zn {sup}（2 +），Ni {sup}（2+）和Co {sup}（2+）共存也显示出不同程度的相似效应。本研究证明了生物型锰氧化物对砷的氧化和吸附的特征，并提出了开发一种微生物处理系统的可能性，该系统适用于被砷污染的水，适合于实际污染情况。

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