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首页> 外文期刊>Environmental Science & Technology >Reoxidation of Reduced Uranium with Iron(lll)(Hydr)Oxides under Sulfate-Reducing Conditions
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Reoxidation of Reduced Uranium with Iron(lll)(Hydr)Oxides under Sulfate-Reducing Conditions

机译：在硫酸盐还原条件下用氧化铁（III）（氢氧化）对还原铀进行再氧化

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摘要

In cultures of Desulfovibrio desulfuricans G20 the effects of iron(lll)(hydr)oxides(hematite,goethite,and ferrihydrite)on microbial reduction and reoxidation of uranium(U)were evaluated under lactate-limited sulfate-reducing conditions.With lactate present,G20 reduced U(VI)in both 1,4-piperazinediethanesulfonate(PIPES)and bicarbonate buffer.Once lactate was depleted,however,microbiafly reduced U served as an electron donor to reduce Fe(lll)present in iron(lll)(hydr)oxides.With the same initial amount of Fe(lll)(10 mmol/L)for each iron(lll)(hydr)oxide,reoxidation of U(IV)was greater with hematite than with goethite or ferrihydrite.As the initial mass loading of hematite increased from 0 to 20 mmol of Fe(lll)/L,the rate and extent of U(IV)reoxidation increased.Subsequent addition of hematite [15 mmol of Fe(lll)/L] to stationary-phase cultures containing microbially reduced U(IV)also resulted in rapid reoxidation to U(VI).Analysis by U L_3-edge X-ray absorption near-edge spectroscopy(XANES)of microbially reduced U particles yielded spectra similar to that of natural uraninite.Observations by high-resolution transmission electron microscopy,selected area electron diffraction,and energy-dispersive X-ray spectroscopic analysis confirmed that precipitated U associated with cells was uraninite with particle diameters of 3-5 nm.By the same techniques,iron sulfide precipitates were found to have a variable Fe and S stoichiometry and were not associated with cells.
机译：在脱硫弧菌G20的培养物中，评估了在乳酸限制的硫酸盐还原条件下氧化铁（III）（氢）氧化物（赤铁矿，针铁矿和三水铝石）对铀（U）微生物还原和再氧化的影响。 G20还原1,4-哌嗪二乙烷磺酸盐（PIPES）和碳酸氢盐缓冲液中的U（VI）。一旦耗尽乳酸，微粉虫将U用作电子供体，还原铁（III）（水）中的Fe（III）每种铁（III）（氢氧化）氧化物的初始Fe（III）（10 mmol / L）的初始含量相同时，赤铁矿的U（IV）的重氧化作用比针铁矿或三水铁矿的重氧化作用更大。的赤铁矿含量从0增加到20 mmol Fe（III）/ L，U（IV）再氧化的速率和程度增加。随后将赤铁矿[15 mmol Fe（III）/ L]添加到含微生物的固定相培养物中还原的U（IV）也导致快速再氧化为U（VI）.U L_3-边缘X射线吸收近边缘光谱分析（XANE）微生物还原的U颗粒产生的S）产生的光谱类似于天然铀尿石。通过高分辨率透射电子显微镜，选择区域电子衍射和能量色散X射线光谱分析观察证实，与细胞缔合的沉淀U是具有颗粒的铀尿石。直径3-5 nm。通过相同的技术，发现硫化铁沉淀具有可变的Fe和S化学计量，并且与细胞无关。

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  • 来源
    《Environmental Science & Technology》 |2005年第7期|p.2059-2066|共8页
  • 作者

    Rajesh K.Sani; T Brent M.Peyton; Alice Dohnalkova; James E.Amonette;

  • 作者单位

    Department of Chemical Engineering, Center for Multiphase Environmental Research,Washington State University,Dana Hall Room 118,Pullman,Washington 99164-2710,and Fundamental Sciences Directorate,Pacific Northwest National Laboratory,9O_2 Battelle Bou;

    Department of Chemical Engineering, Center for Multiphase Environmental Research,Washington State University,Dana Hall Room 118,Pullman,Washington 99164-2710,and Fundamental Sciences Directorate,Pacific Northwest National Laboratory,9O_2 Battelle Bou;

    Department of Chemical Engineering, Center for Multiphase Environmental Research,Washington State University,Dana Hall Room 118,Pullman,Washington 99164-2710,and Fundamental Sciences Directorate,Pacific Northwest National Laboratory,9O_2 Battelle Bou;

    Department of Chemical Engineering, Center for Multiphase Environmental Research,Washington State University,Dana Hall Room 118,Pullman,Washington 99164-2710,and Fundamental Sciences Directorate,Pacific Northwest National Laboratory,9O_2 Battelle Bou;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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