• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Uranium(VI) Adsorption and Surface Complexation Modeling onto Background Sediments from the F-Area Savannah River Site
【24h】

Uranium(VI) Adsorption and Surface Complexation Modeling onto Background Sediments from the F-Area Savannah River Site

机译：F区域萨凡纳河站点背景沉积物上的铀（VI）吸附和表面络合建模

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

The mobility of an acidic uranium waste plume in the F-Area of Savannah River Site is of great concern. In order to understand and predict uranium mobility, U(VI) adsorption experiments were performed as a function of pH using background F-Area aquifer sediments and reference goethite and kaolinite (major reactive phases of F-Area sediments), and a component-additivity (CA) based surface complexation model (SCM) was developed. Our experimental results indicate that the fine fractions (≤45 μm) in sediments control U(VI) adsorption due to their large surface area, although the quartz sands show a stronger adsorption ability per unit surface area than the fine fractions at pH < 5.0. Kaolinite is a more important sorbent for U(VI) at pH < 4.0, while goethite plays a major role at pH > 4.0. Our CA model combines an existing U(VI) SCM for goethite and a modified U(VI) SCM for kaolinite along with estimated relative surface area abundances of these component minerals. The modeling approach successfully predicts U(VI) adsorption behavior by the background F-Area sediments. The model suggests that exchange sites on kaolinite dominate U(Vl) adsorption at pH < 4.0, goethite and kaolinite edge sites cocontribute to U(VI) adsorption at pH 4.0-6.0, and goethite dominates U(VI) adsorption at pH > 6.0.
机译：萨凡纳河站点F区中酸性铀废羽的流动性引起极大关注。为了理解和预测铀的迁移率，使用背景F区含水层沉积物，参比针铁矿和高岭石（F区沉积物的主要反应相）以及组分加和性进行了U（VI）吸附实验，将其作为pH的函数。 （CA）基于表面的络合模型（SCM）被开发。我们的实验结果表明，尽管在pH <5.0的条件下，石英砂的每单位表面积的吸附能力比细颗粒强，但沉积物中的细颗粒（≤45μm）由于其较大的表面积而控制了U（VI）的吸附。高岭石在pH <4.​​0时对于U（VI）来说是更重要的吸附剂，而针铁矿在pH> 4.0时起主要作用。我们的CA模型结合了现有的针铁矿U（VI）SCM和高岭石的改良U（VI）SCM，以及这些成分矿物的估计相对表面积丰度。该建模方法成功地预测了背景F区沉积物对U（VI）的吸附行为。该模型表明，在pH <4.​​0时，高岭石上的交换位点占主导地位的U（VI）吸附，在pH值4.0-6.0时，针铁矿和高岭石边缘位点共同促成U（VI）的吸附作用，而当pH值高于6.0时，针铁矿主导了U（VI）的吸附作用。

著录项

  • 来源
    《Environmental Science & Technology》 |2012年第3期|p.1565-1571|共7页
  • 作者

    Wenming Dong; Tetsu K. Tokunaga; James A. Davis; Jiamin Wan;

  • 作者单位

    Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California;

    Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California;

    Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California;

    Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California;

  • 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