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首页> 外文期刊>Environmental Science & Technology >Macroscopic And X-ray Photoelectron Spectroscopic Investigation Of Interactions Of Arsenic With Synthesized Pyrite
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Macroscopic And X-ray Photoelectron Spectroscopic Investigation Of Interactions Of Arsenic With Synthesized Pyrite

机译：砷与黄铁矿相互作用的宏观和X射线光电子能谱研究

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摘要

Interactions of arsenic with synthesized pyrite were investigated using macroscopic (solution phase experiments) and microscopic (X-ray photoelectron spectroscopic investigation) approaches. Arsenic removal by pyrite was strongly dependent on pH and arsenic species. Both arsenite (As(III)) and arsenate (As(V)) had a strong affinity for the pyrite surface under acidic conditions, but As(III) was more effectively removed than As(V). A BET isotherm equation provided the best fit to arsenic removal data, suggesting that surface precipitation occurred at a high arsenic/pyrite ratio. The addition of competing ions did not substantially affect the ultimate distribution of arsenic between the pyrite surface and the solution, but changing the pH affected arsenic stability on pyrite. X-ray photoelectron spectroscopy (XPS) revealed that under acidic conditions, arsenic was removed by reaction with pyrite to form solid phases similar to AS_2S_3 and AS_4S_4. However, under neutral to alkaline conditions, arsenic was removed by sorption and precipitation to form solid phases that are similar to FeAsS and AS_2S_3/AS_4S_4.
机译：使用宏观（溶液相实验）和微观（X射线光电子能谱研究）方法研究了砷与合成黄铁矿的相互作用。黄铁矿除砷在很大程度上取决于pH值和砷的种类。砷（As（III））和砷酸盐（As（V））在酸性条件下均对黄铁矿表面具有很强的亲和力，但与As（V）相比，As（III）的去除效率更高。 BET等温线方程最适合除砷数据，表明表面沉淀以高砷/黄铁比发生。竞争离子的添加​​基本上不会影响黄铁矿表面和溶液之间砷的最终分布，但是改变pH值会影响砷在黄铁矿上的稳定性。 X射线光电子能谱（XPS）显示，在酸性条件下，砷与黄铁矿反应而除去了砷，形成类似于AS_2S_3和AS_4S_4的固相。然而，在中性至碱性条件下，砷通过吸附和沉淀去除，形成类似于FeAsS和AS_2S_3 / AS_4S_4的固相。

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  • 来源
    《Environmental Science & Technology》 |2009年第8期|2899-2904|共6页
  • 作者

    EUN JUNG KIM; BILL BATCHELOR;

  • 作者单位

    Department of Civil Engineering, Texas A&M University, 3136 TAMU, College Station, Texas 77843 Department of Civil and Environmental Engineering, University of Western Ontario, London, Ontario, Canada N6A 5B9;

    Department of Civil Engineering, Texas A&M University, 3136 TAMU, College Station, Texas 77843;

  • 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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