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首页> 外文期刊>Journal of Colloid and Interface Science >The effects of iron(II) on the kinetics of arsenic oxidation and sorption on manganese oxides
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The effects of iron(II) on the kinetics of arsenic oxidation and sorption on manganese oxides

机译:铁(II)对砷氧化和锰氧化物吸附动力学的影响

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摘要

In this study, As(III) oxidation kinetics by a poorly-crystalline phyllomanganate (delta-MnO2) in the presence and absence of dissolved Fe(II) was investigated using stirred-flow and batch experiments. Chemically synthetic delta-MnO2 was reacted with four influent solutions, containing the same As(III) concentration but different Fe(II) concentrations, at pH 6. The results show an initial rapid As(III) oxidation by delta-MnO2, which is followed by an appreciably slow reaction after 8 h. In the presence of Fe(II), As(III) oxidation is inhibited due to the competitive oxidation of Fe(II) as well as the formation of Fe(III)-(hydr)oxides on the delta-MnO2 surface. However, the sorption of As(III), As(V) and Mn(II) are increased, for the newly formed Fe(III)-(hydr)oxides provide additional sorption sites. This study suggests that the competitive oxidation of Fe(II) and consequently the precipitation of Fe(III) compounds on the delta-MnO2 surface play an important role in As(III) oxidation and As sequestration. Understanding these processes would be helpful in developing in situ strategies for remediation of As-contaminated waters and soils. (C) 2015 Elsevier Inc. All rights reserved.
机译:在这项研究中,使用搅拌流和分批实验研究了在存在和不存在溶解的Fe(II)的情况下,低结晶性叶锰酸盐(δ-MnO2)的As(III)氧化动力学。化学合成的δ-MnO2在pH值为6的情况下与四种进水溶液反应,该溶液含有相同的As(III)浓度但不同的Fe(II)浓度。结果显示,δ-MnO2最初快速氧化了As(III),这是8小时后反应缓慢。在Fe(II)的存在下,由于Fe(II)的竞争性氧化以及在δ-MnO2表面上形成Fe(III)-(氢)氧化物,抑制了As(III)的氧化。然而,由于新形成的Fe(III)-(氢)氧化物提供了额外的吸附位,因此As(III),As(V)和Mn(II)的吸附增加。这项研究表明,Fe(II)的竞争性氧化以及由此导致的Fe(III)化合物在δ-MnO2表面上的沉淀在As(III)的氧化和As的螯合中起重要作用。了解这些过程将有助于制定原位修复被砷污染的水和土壤的策略。 (C)2015 Elsevier Inc.保留所有权利。

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