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Reactions of ferrous iron with iron oxides under an anoxic environment.

机译：在缺氧环境下亚铁与氧化铁的反应。

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摘要

The adsorption of Fe(II) onto hematite was studied through the sorption edges, isotherms, and kinetics experiments. The adsorption of Fe(II) onto hematite was measured as a function of pH, surface area, and time. The effects of anions (chloride, sulfate, or nitrate) and of Zn(II) were also determined. All experiments were conducted under strict anoxic conditions with 5 or 30 days for equilibration. Results showed that immobilization of Fe(II) on hematite consists of a fast sorption process and one or more slow processes, which probably include both sorption and formation of new phases. Sorption occurred at pH as low as 4, which has not been reported in existing literature. Some Fe(II) could not be extracted after 20 hours with 0.5 N HCl.; The adsorption kinetics of Fe(II) onto hematite was measured and a hypothetical model was developed to explain the experimental observations. There were several distinct sorption kinetic stages onto hematite for Fe(II) at pH 6.8. When 0.25 mM of Fe(II) was added into 2 g/L of hematite solution, approximately 10% of Fe(II) was instantaneously adsorbed within a minute followed by rapid sorption up to 20% within 2 days. The uptake of Fe(II) was slowly and continuously increased for the next 23 days up to 24%. There was a sudden increase at 30 days and 28% of Fe(II) was up-taken. The sorption of Fe(II) was continued, and 30% of added Fe(II) was up-taken after 45 days of equilibration time, and approximately 10% of added Fe(II) was fixed onto hematite that was not recoverable by 0.5 N HCl extraction. The fixation of added Fe(II) onto hematite was more apparent when less amount of Fe(II) (0.125 mM) was added under the same solution chemistry. Significant amounts of Fe(II) was also adsorbed at pH 4.3 and 4.5.; The adsorption kinetics of Fe(II) and other divalent metal ions including Zn, Co, Ni, and Cd on hematite was studied at pH 6.8 in the single and competitive binary systems with high sorbate/sorbent ratio. The binary systems contained Fe(II) plus metal ion to investigate the competition between Fe(II) and other divalent metal ions. The sorption affinity of divalent metal ions on hematite were in order of Fe ∼ Zn > Co ∼ Ni > Cd. (Abstract shortened by UMI.)
机译：通过吸附边，等温线和动力学实验研究了Fe（II）在赤铁矿上的吸附。测量Fe（II）在赤铁矿上的吸附随pH，表面积和时间的变化。还确定了阴离子（氯离子，硫酸根或硝酸根）和Zn（II）的影响。所有实验均在严格的缺氧条件下进行，平衡5或30天。结果表明，铁（II）在赤铁矿上的固定包括一个快速的吸附过程和一个或多个缓慢的过程，这可能包括吸附和形成新相。在低至4的pH值下发生吸附，这在现有文献中尚未见报道。用0.5 N HCl在20小时后不能提取出某些Fe（II）。测量了Fe（II）在赤铁矿上的吸附动力学，并建立了一个假设模型来解释实验结果。在pH 6.8下，赤铁矿对Fe（II）有几个不同的吸附动力学阶段。当将0.25 mM的Fe（II）添加到2 g / L的赤铁矿溶液中时，在一分钟之内即刻吸附约10％的Fe（II），然后在2天内迅速吸附至20％。在接下来的23天中，Fe（II）的吸收缓慢且持续增加，直至24％。 30天时突然增加，并且摄取了28％的Fe（II）。继续吸附Fe（II），经过45天的平衡时间后吸收了30％的添加的Fe（II），大约10％的添加的Fe（II）被固定在无法回收的赤铁矿上0.5用N HCl萃取。当在相同的溶液化学条件下添加较少量的Fe（II）（0.125 mM）时，添加的Fe（II）在赤铁矿上的固定作用更加明显。在pH 4.3和4.5下也吸附了大量的Fe（II）。研究了Fe（II）和其他二价金属离子（包括Zn，Co，Ni和Cd）在赤铁矿上的吸附动力学，其pH为6.8，在具有高吸附剂/吸附剂比的单一竞争二元体系中。二元体系包含Fe（II）和金属离子，以研究Fe（II）与其他二价金属离子之间的竞争。二价金属离子在赤铁矿上的吸附亲和力依次为Fe〜Zn> Co〜Ni> Cd。 （摘要由UMI缩短。）

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  • 作者

    Jeon, Byong-Hun.;

  • 作者单位

    The Pennsylvania State University.;

  • 授予单位 The Pennsylvania State University.;
  • 学科 Engineering Environmental.; Environmental Sciences.; Geochemistry.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 179 p.
  • 总页数 179
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境污染及其防治;环境科学基础理论;地质学;
  • 关键词

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