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首页> 外文期刊>Environmental Science & Technology >Effect of Iron(Ⅱ) on Arsenic Sequestration by δ-MnO_2: Desorption Studies Using Stirred-Flow Experiments and X-Ray Absorption Fine-Structure Spectroscopy
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Effect of Iron(Ⅱ) on Arsenic Sequestration by δ-MnO_2: Desorption Studies Using Stirred-Flow Experiments and X-Ray Absorption Fine-Structure Spectroscopy

机译：铁（Ⅱ）对δ-MnO_2螯合砷的影响：搅拌流实验和X射线吸收精细结构光谱研究脱附

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摘要

Arsenic (As) mobility in the environment is greatly affected by its oxidation state and the degree to which it is sorbed on metal oxide surfaces. Manganese (Mn) and iron (Fe) oxides ate ubiquitous solids in terrestrial systems and have high sorptive capacities for many trace metals, including As. Although numerous studies have studied the effects of As adsorption and desorption onto Fe and Mn oxides individually, the fate of As within mixed systems representative of natural environments has not been resolved, In mis research, As(Ⅲ) was initially reacted with a poorly crystalline phyllnmanganate (δ-MnO_2) in the presence of Fe(Ⅱ) prior to desorption. This initial reaction resulted in the sorption of both As(Ⅲ) and As(Ⅴ) on mixed Fe/Mn-oxides surfaces. A desorption study was carried out using two environmentally significant tons, phosphate (PO_4~(3-)) and calcium (Ca~(2+)). Both a stirred-flow technique and X-ray absorption fine-structure spectroscopy (XAFS) analysis were used to investigate As desorption behavior. Results showed that when As(Ⅲ)/Fe(Ⅱ) = 1:1 in the initial reaction, only As(Ⅴ) was desorbed, agreeing with a previous study showing mat As(Ⅲ) is not associated with the Fe/Mn-oxides. When As(Ⅲ)/Fe(Ⅱ) = 1:10 in the initial reaction, bom As(Ⅲ) and As(Ⅴ) can be desorbed from the Fe/Mn-oxide surface, and more As(Ⅲ) is desorbed man As(Ⅴ). Neither of the desorbents used in this study completely removed As(Ⅲ) or As(Ⅴ) from the Fe/Mn-oxides surface. However, the As desorption fraction decreases with increasing Fe(Ⅱ) concentration in the initial reactions.
机译：砷在环境中的迁移率受其氧化态及其在金属氧化物表面吸附的程度的很大影响。锰（Mn）和铁（Fe）氧化物在陆地系统中普遍存在，并且对许多微量金属（包括As）具有高吸附能力。尽管大量研究单独研究了砷吸附和解吸对Fe和Mn氧化物的影响，但尚未解决代表自然环境的混合体系中As的命运。在错误的研究中，As（Ⅲ）最初与不良结晶反应解吸前在Fe（Ⅱ）存在下锰铁酸钙（δ-MnO_2）。该初始反应导致混合的Fe / Mn-氧化物表面吸附As（Ⅲ）和As（Ⅴ）。使用两个对环境有影响的吨磷酸盐（PO_4〜（3-））和钙（Ca〜（2+））进行了脱附研究。搅拌流技术和X射线吸收精细结构光谱（XAFS）分析都用于研究砷的解吸行为。结果表明，当初始反应中As（Ⅲ）/ Fe（Ⅱ）= 1：1时，只有As（Ⅴ）被解吸，这与先前的研究表明As（Ⅲ）与Fe / Mn-不相关。氧化物。在初始反应中As（Ⅲ）/ Fe（Ⅱ）= 1：10时，可以从Fe / Mn-氧化物表面解吸出As（Ⅲ）和As（Ⅴ），并且更多的As（Ⅲ）被解吸作为（Ⅴ）。本研究中使用的两种解吸剂均未从Fe / Mn-氧化物表面完全去除As（Ⅲ）或As（Ⅴ）。然而，在初始反应中，As解吸分数随Fe（Ⅱ）浓度的增加而降低。

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  • 来源
    《Environmental Science & Technology》 |2015年第22期|13360-13368|共9页
  • 作者

    Yun Wu; Wei Li; Donald L. Sparks;

  • 作者单位

    Environmental Soil Chemistry Research Group, Delaware Environmental Institute, University of Delaware, Newark, Delaware 19716, United States;

    Environmental Soil Chemistry Research Group, Delaware Environmental Institute, University of Delaware, Newark, Delaware 19716, United States ,Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, People's Republic of China;

    Environmental Soil Chemistry Research Group, Delaware Environmental Institute, University of Delaware, 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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