...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >X-ray Analyses of Lead Adsorption on the (001), (110), and (012) Hematite Surfaces
【24h】

X-ray Analyses of Lead Adsorption on the (001), (110), and (012) Hematite Surfaces

机译：X射线分析（001），（110）和（012）赤铁矿表面上的铅吸附

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Predicting the environmental fate of lead relies on a detailed understanding of its coordination to mineral surfaces, which in turn reflects the innate reactivity of the mineral surface. In this research, we investigated fundamental dependencies in lead adsorption to hematite by coupling extended X-ray absorption fine structure (EXAFS) spectroscopy on hematite particles (10 and 50 nm) with resonant anomalous X-ray reflectivity (RAXR) to single crystals expressing the (001), (012), or (110) crystallographic face. The EXAFS showed that lead adsorbed in a bidentate inner-sphere manner in both edge and corner sharing arrangements on the FeO_6 octahedra for both particle sizes. The RAXR measurements confirmed these inner-sphere adsorption modes for all three hematite surfaces and additionally revealed outer-sphere adsorption modes not seen in the EXAFS. Lead uptake was larger and pH dependence was greater for the (012) and (110) surfaces, than the (001) surface, due to their expressing singly- and triply coordinated oxygen atoms the (001) surface lacks. In coupling these two techniques we provide a more detailed and nuanced picture of the coordination of lead to hematite while also providing fundamental insight into the reactivity of hematite.
机译：预测铅的环境命运取决于对铅与矿物表面的配合的详细了解，这反过来又反映了矿物表面的固有反应性。在这项研究中，我们通过将赤铁矿颗粒（10和50 nm）上的扩展X射线吸收精细结构（EXAFS）光谱与共振异常X射线反射率（RAXR）耦合到表达该晶体的单晶上，研究了铅吸附到赤铁矿的基本依赖性。 （001），（012）或（110）结晶面。 EXAFS显示，对于两种粒径，在FeO_6八面体的边缘和角落共享布置中，铅均以双齿内球方式吸附。 RAXR测量结果证实了所有三个赤铁矿表面的内球吸附模式，另外还揭示了EXAFS中未发现的外球吸附模式。 （012）和（110）表面的铅吸收量更大，并且对pH的依赖性大于（001）表面，这是因为（001）表面缺少单配位和三配位的氧原子。通过结合这两种技术，我们可以更详细，细致地了解铅与赤铁矿的配位关系，同时还提供了对赤铁矿反应性的基本了解。

著录项

  • 来源
    《Environmental Science & Technology》 |2016年第22期|12283-12291|共9页
  • 作者

    Matthew R. Noerpel; Sang Soo Lee; John J. Lenhart;

  • 作者单位

    Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, Ohio 43210, United States,United States Environmental Protection Agency, 5995 Center Hill Ave., Cincinnati, Ohio 45224, United States;

    Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States;

    Department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, Ohio 43210, 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号