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首页> 外文期刊>Environmental Science & Technology >Photoinduced Oxidation of Arsenite to Arsenate on Ferrihydrite
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Photoinduced Oxidation of Arsenite to Arsenate on Ferrihydrite

机译：水铁矿上砷的光诱导氧化为砷

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摘要

The photochemistry of an aqueous suspension of the iron oxyhydroxide, ferrihydrite, in the presence of arsenite has been investigated using attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), X-ray absorption near edge structure (XANES), and solution phase analysis. Both ATR-FTIR and XANES show that the exposure of ferrihydrite to arsenite in the dark leads to no change in the As oxidation state, but the exposure of this arsenite-bearing surface, which is in contact with pH 5 water, to light leads to the conversion of the majority of the adsorbed arsenite to the As(V) bearing species, arsenate. Analysis of the solution phase shows that ferrous iron is released into solution during the oxidation of arsenite. The photochemical reaction, however, shows the characteristics of a self-terminating reaction in that there is a significant suppression of this redox chemistry before 10% of the total iron making up the ferrihydrite partitions into solution as ferrous iron. The self-terminating behavior exhibited by this photochemical arsenite/ferrihydrite system is likely due to the passivation of the ferrihydrite surface by the strongly bound arsenate product.
机译：已使用衰减全反射傅里叶变换红外光谱（ATR-FTIR），近边缘结构的X射线吸收（XANES）和溶液相分析研究了羟基氧化铁铁水合物在砷存在下的水悬浮液的光化学性质。 。 ATR-FTIR和XANES均表明，在黑暗中亚铁酸盐暴露于亚铁水合物不会导致As氧化态的变化，但与pH 5的水接触的这种含砷表面暴露于光会导致大部分吸附的亚砷酸盐转化为带有As（V）的砷酸盐。溶液相的分析表明，亚铁氧化过程中亚铁释放到溶液中。然而，光化学反应显示出自终止反应的特征，因为在构成三价铁的总铁的10％分配为亚铁之前，该氧化还原化学被显着抑制。这种光化学亚砷酸盐/水铁矿体系表现出的自终止行为可能是由于强结合的砷酸盐产物对亚水铁矿表面的钝化。

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  • 来源
    《Environmental Science & Technology》 |2011年第7期|p.2783-2789|共7页
  • 作者

    Narayan Bhandari; Richard J. Reeder; Daniel R. Strongin;

  • 作者单位

    Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States;

    Department of Geosciences, State University of New York at Stony Brook, Stony Brook, New York 11794, United States;

    Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, 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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