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首页> 外文期刊>Environmental Science & Technology >Different Arsenate and Phosphate Incorporation Effects on the Nucleation and Growth of Iron(Ⅲ) (Hydr)oxides on Quartz
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Different Arsenate and Phosphate Incorporation Effects on the Nucleation and Growth of Iron(Ⅲ) (Hydr)oxides on Quartz

机译：砷和磷酸盐的不同掺合作用对石英中三氧化二铁成核和生长的影响

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摘要

Iron(Ⅲ) (hydr)oiides play an important role in the geochemical cycling of contaminants in natural and engineered aquatic systems. The ability of iron(Ⅲ) (hydr)oxides to immobilize contaminants can be related to whether the precipitates form heterogeneously (e.g., at mineral surfaces) or homogeneously in solution. Utilizing grazing incidence small-angle X-ray scattering (GISAXS), we studied heterogeneous iron(Ⅲ) (hydr)oxide nucleation and growth on quartz substrates for systems containing arsenate and phosphate anions. For the iron(Ⅲ) only system, the radius of gyration (R_g) of heterogeneously formed precipitates grew from 1.5 to 2.5 (±1.0) nm within 1 h. For the system containing 10~(-5) M arsenate, R_g grew from 3.6 to 6.1 (±0.5) nm, and for the system containing 10~(-5) M phosphate, JR. grew from 2.0 to 4.0 (±0.2) nm. While the systems containing these oxyanions had more growth, the system containing only iron(Ⅲ) had the most nucleation events on substrates. Ex situ analyses of homogeneously and heterogeneously formed precipitates indicated that precipitates in the arsenate system had the highest water content and that oxyanions may bridge iron(Ⅲ) hydroxide polymeric embryos to form a structure similar to ferric arsenate or ferric phosphate. These new findings are important because differences in nucleation and growth rates and particle sizes will impact the number of available reactive sites and the reactivity of newly formed particles toward aqueous contaminants.
机译：铁（Ⅲ）（氢）化物在自然和工程水生系统中污染物的地球化学循环中起着重要作用。氢氧化铁（III）固定污染物的能力可能与沉淀物在溶液中的形成是不均匀的（例如在矿物表面）还是均匀形成的有关。利用掠入射小角X射线散射（GISAXS），我们研究了含砷酸根和磷酸根阴离子的异质铁（Ⅲ）（羟基）氧化物在石英衬底上的成核和生长。对于仅铁（Ⅲ）系统，在1小时内异质形成的沉淀物的回转半径（R_g）从1.5 nm增加到2.5（±1.0）nm。对于含10〜（-5）M砷酸盐的体系，R_g从3.6 nm增加到6.1（±0.5）nm，对于含10〜（-5）M磷酸盐的体系JR。从2.0纳米增加到4.0（±0.2）纳米虽然含这些氧阴离子的体系有更多的生长，但仅含铁（Ⅲ）的体系在底物上的成核事件最多。异质形成的析出物的异位分析表明，砷酸盐体系中的析出物具有最高的水分含量，并且氧阴离子可以桥接氢氧化铁（Ⅲ）聚合物胚，形成类似于砷酸铁或磷酸铁的结构。这些新发现很重要，因为成核，生长速率和粒径的差异会影响可用的反应位点的数量以及新形成的粒子对水性污染物的反应性。

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  • 来源
    《Environmental Science & Technology》 |2014年第20期|11883-11891|共9页
  • 作者

    Chelsea W. Neil; Byeongdu Lee; Young-Shin Jun;

  • 作者单位

    Department of Energy, Environmental and Chemical Engineering, Washington University, St. Louis, Missouri 63130, United States;

    X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States;

    Department of Energy, Environmental and Chemical Engineering, Washington University, St. Louis, Missouri 63130, 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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