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首页> 外文期刊>Environmental Science & Technology >Arsenhe Oxidation by a Poorly Crystalline Manganese-Oxide 1.Stirred-Flow Experiments
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Arsenhe Oxidation by a Poorly Crystalline Manganese-Oxide 1.Stirred-Flow Experiments

机译：结晶度较弱的锰氧化物氧化Arsenhe 1.搅拌流实验

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摘要

Manganese-oxides (Mn-oxides) are quite reactive, with respect to arsenite (As~(III)) oxidation. However, studies regarding the pathways of As~(III) oxidation, over a range of time scales, by poorly crystalline Mn-oxides, are lacking. In strred-flow experiments, As~(III) oxidation by δ-MnO_2 (a poorly crystalline form of hexagonal birnessrte) is initially rapid but slows appreciably after several hours of reaction. Mn~(II) is the only reduced product of δ-MnO_2 formed by As~(III) oxidation during the initial, most rapid phase of the reaction. There seems to be evidence that the formation of Mn~(III) observed in previous studies is a result of conproportionation of Mn~(II) sorbed onto Mn~(IV) reaction sites rather than from direct reduction of Mn~(IV) by As~(III). The only evidence of arsenic (As) sorption during As~(III) oxidation by δ-MnO_2 is during the first 10 h of reaction, and As sorption is greater when As~V and Mn~(II) occur simultaneously in solution. Our findings indicate that As~(III) oxidation by poorly crystalline δ-MnO_2 involves several simultaneous reactions and reinforces the importance of studying reaction mechanisms over time.
机译：锰氧化物（As〜（III））的氧化反应性很强。然而，缺乏关于结晶度较弱的Mn-氧化物在一定时间范围内As〜（III）氧化途径的研究。在流流实验中，δ-MnO_2（六方六方晶的不良结晶形式）的As〜（III）氧化起初较快，但经过数小时的反应却明显减慢。 Mn〜（II）是在反应的初始，最快速阶段由As〜（III）氧化形成的δ-MnO_2的唯一还原产物。似乎有证据表明，先前研究中观察到的Mn〜（III）的形成是吸附在Mn〜（IV）反应位上的Mn〜（II）的共配作用的结果，而不是由Mn〜（IV）的直接还原所致。如〜（III）。 δ-MnO_2氧化As〜（III）期间砷（As）吸附的唯一证据是在反应的前10小时内，当溶液中同时出现As〜V和Mn〜（II）时，As吸附更大。我们的发现表明，不良结晶的δ-MnO_2氧化As〜（III）涉及多个同时反应，并加强了研究随时间变化的反应机理的重要性。

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  • 来源
    《Environmental Science & Technology》 |2010年第22期|p.8460-8466|共7页
  • 作者

    BRANDON J. LAFFERTY; MATTHEW GINDER-VOGEL; DONALD L. SPARKS;

  • 作者单位

    Department of Plant and Soil Sciences, Delaware Environmental Institute, University of Delaware, 152 Townsend Hall, Newark, Delaware 19716, United States,Calera Corporation, 14600 Winchester Blvd., Los Gatos, CA 95030;

    Department of Plant and Soil Sciences, Delaware Environmental Institute, University of Delaware, 152 Townsend Hall, Newark, Delaware 19716, United States;

    Department of Plant and Soil Sciences, Delaware Environmental Institute, University of Delaware, 152 Townsend Hall, Newark, Delaware 19716, United States;

  • 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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  • 正文语种 eng
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