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首页> 外文期刊>Environmental Science & Technology >Macroscopic and Spectroscopic Assessment of the Cosorption of Fe(Ⅱ) with As(Ⅲ) and As(Ⅴ) on Al-Oxide
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Macroscopic and Spectroscopic Assessment of the Cosorption of Fe(Ⅱ) with As(Ⅲ) and As(Ⅴ) on Al-Oxide

机译：宏观和光谱评估Fe（Ⅱ）与As（Ⅲ）和As（Ⅴ）在氧化铝上的吸附

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摘要

The cosorption of Fe(Ⅱ) with As(Ⅲ) and As(Ⅴ) in anoxic suspensions of γ-Al_2O_3 at pH 7.5 was investigated with batch kinetic experiments and synchrotron EXAFS analyses. Single-sorbate results showed that Fe(Ⅱ) formed secondary Fe(Ⅱ)-Al(Ⅲ)-layered double hydroxide (LDH) phases during reaction with the Al-oxide sorbent, whereas As(Ⅲ) and As(Ⅴ) formed inner-sphere surface complexes. The kinetics and mechanisms of Fe(Ⅱ) and As(Ⅲ) sorption were identical in dual-sorbate and single-sorbate experiments, indicating that the processes involved operate independently. In contrast, As(Ⅴ) and Fe(Ⅱ) interacted strongly during cosorption. Fe(Ⅱ) enhanced the rate and extent of As(Ⅴ) removal from solution, but did not affect the mechanism of As(Ⅴ) adsorption. Conversely, As(Ⅴ) hindered the formation of Fe(Ⅱ)-Al(Ⅲ)-LDH, slowing down precipitation at low As(Ⅴ) concentrations and preventing it at high concentrations. This was attributed to interference of adsorbed As(Ⅴ) with the Al supply needed for Fe(Ⅱ)-Al(Ⅲ)-LDH precipitation, possibly combined with enhanced surface complexation of Fe(Ⅱ) cations promoted by anionic As(Ⅴ) surface species. No evidence was found for redox reactions between Fe(Ⅱ) and As(Ⅴ) or As(Ⅲ), or for precipitation of Fe-arsenic phases. These results improve our understanding of the geochemistry of Fe(Ⅱ) and arsenic in reducing environments, and demonstrate the utility of mechanistic studies on geochemically complex model systems.
机译：通过分批动力学实验和同步加速器EXAFS分析研究了Fe（Ⅱ）与As（Ⅲ）和As（Ⅴ）在γ-Al_2O_3缺氧悬浮液在pH 7.5下的共吸附。单吸附物的结果表明，Fe（Ⅱ）在与Al2O3吸附剂反应过程中形成了Fe（Ⅱ）-Al（Ⅲ）层的二次氢氧化物（LDH）二次相，而As（Ⅲ）和As（Ⅴ）形成了内相。球表面配合物。在双吸附物和单吸附物实验中，Fe（Ⅱ）和As（Ⅲ）的吸附动力学和机理均相同，表明所涉及的过程是独立进行的。相反，As（Ⅴ）和Fe（Ⅱ）在共吸附过程中相互作用强烈。 Fe（Ⅱ）提高了溶液中As（Ⅴ）的去除率和程度，但不影响As（Ⅴ）的吸附机理。相反，As（Ⅴ）阻碍了Fe（Ⅱ）-Al（Ⅲ）-LDH的形成，减缓了低As（Ⅴ）浓度下的析出并阻止了高浓度下的析出。这可能是由于吸附的As（Ⅴ）干扰了Fe（Ⅱ）-Al（Ⅲ）-LDH沉淀所需的Al供应，可能与阴离子As（Ⅴ）表面促进的Fe（Ⅱ）阳离子的表面络合作用增强有关。种类。没有证据表明Fe（Ⅱ）和As（Ⅴ）或As（Ⅲ）之间发生氧化还原反应，或铁砷相的沉淀。这些结果提高了我们对还原环境中Fe（Ⅱ）和砷的地球化学的理解，并证明了机理研究在地球化学复杂模型系统中的实用性。

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  • 来源
    《Environmental Science & Technology》 |2015年第22期|13369-13377|共9页
  • 作者

    Ying Zhu; Evert J. Elzinga;

  • 作者单位

    Rutgers University, Department of Earth & Environmental Sciences, 101 Warren Street, Newark, New Jersey 07102, United States;

    Rutgers University, Department of Earth & Environmental Sciences, 101 Warren Street, Newark, New Jersey 07102, 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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