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Structural Transformation of MnO_2 during the Oxidation of Bisphenol A

机译：双酚A氧化过程中MnO_2的结构转变

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摘要

Bisphenol A (BPA) is an endocrine-disrupting compound widely used in the plastic industry and found in natural waters at concentrations considered harmful for aquatic life. BPA is susceptible to oxidation by Mn(III/IV) oxides, which are commonly found in near-surface environments. Here, we quantify BPA oxidation rates and the formation of its predominant product, 4-hydroxycumyl alcohol (HCA), in tandem with transformation of a synthetic, Mn(lII)-rich δ-MnO_2. To investigate the effect of Mn oxide structural changes on BPA oxidation rate, 12 sequential additions of 80 µM BPA are performed at pH 7. During the additions, BPA oxidation rate decreases by 3 orders of magnitude, and HCA yield decreases from 40% to 3%. This is attributed to the accumulation of interlayer Mn(II/III) produced during the reaction, as observed using X-ray absorption spectroscopy, as well as additional spectroscopic and wet chemical techniques. HCA is oxidized at a rate that is 12.6 times slower than BPA and accumulates in solution. These results demonstrate that BPA degradation by environmentally relevant Mn(III/IV) oxides is inhibited by the . buildup of solid-phase Mn(II/III), specifically in interlayer sites. Nevertheless, Mn oxides may limit BPA migration in near-surface environments and have potential for use in drinking and wastewater treatment.
机译：双酚A（BPA）是一种破坏内分泌的化合物，广泛用于塑料工业，在自然水中发现的浓度对水生生物有害。 BPA易被Mn（III / IV）氧化物氧化，这在近地表环境中很常见。在这里，我们量化了BPA氧化速率及其主要产物4-羟基枯基醇（HCA）的形成，同时合成了富含Mn（II）的δ-MnO_2。为了研究锰氧化物结构变化对BPA氧化速率的影响，在pH 7下进行了12次连续添加80 µM BPA。在添加过程中，BPA氧化速率降低了3个数量级，HCA产率从40％降低至3 ％。这归因于反应过程中产生的中间层Mn（II / III）的积聚，如使用X射线吸收光谱法以及其他光谱学和湿化学技术所观察到的。 HCA的氧化速度比BPA慢12.6倍，并在溶液中累积。这些结果表明，与环境有关的Mn（III / IV）氧化物对BPA的降解作用受到抑制。固相Mn（II / III）的堆积，特别是在夹层部位。但是，锰氧化物可能会限制BPA在近地表环境中的迁移，并有可能用于饮用水和废水处理。

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  • 来源
    《Environmental Science & Technology》 |2017年第11期|6053-6062|共10页
  • 作者

    Sarah Balgooyen; Peter J. Alaimo; Christina K. Remucal; Matthew Ginder-Vogel;

  • 作者单位

    Environmental Chemistry and Technology Program;

    Department of Chemistry, Seattle University, Seattle, Washington 98122, United States;

    Environmental Chemistry and Technology Program,Department of Civil and Environmental Engineering, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States;

    Environmental Chemistry and Technology Program,Department of Civil and Environmental Engineering, University of Wisconsin—Madison, Madison, Wisconsin 53706, 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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