...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Investigation of U(Ⅵ) Adsorption in Quartz-Chlorite Mineral Mixtures
【24h】

Investigation of U(Ⅵ) Adsorption in Quartz-Chlorite Mineral Mixtures

机译：石英-亚氯酸盐矿物混合物中U（Ⅵ）的吸附研究

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

A batch and cryogenic laser-induced time-resolved luminescence spectroscopy investigation of U(Ⅵ) adsorbed on quartz-chlorite mixtures with variable mass ratios have been performed under field-relevant uranium concentrations (5 × 10~(-7) M and 5 × 10~(-6) M) in pH 8.1 synthetic groundwater. The U(Ⅵ) adsorption K_d values steadily increased as the mass fraction of chlorite increased, indicating preferential sorption to chlorite. For all mineral mixtures, U(Ⅵ) adsorption K_d values were lower than that calculated from the assumption of component additivity possibly caused by surface modifications stemming from chlorite dissolution; The largest deviation occurred when the mass fractions of the two minerals were equal. U(Ⅵ) adsorbed on quartz and chlorite displayed characteristic individual luminescence spectra that were not affected by mineral mixing. The spectra of U(Ⅵ) adsorbed within the mixtures could be simulated by one surface U(Ⅵ) species on quartz and two on chlorite. The luminescence intensity decreased in a nonlinear manner as the adsorbed U(Ⅵ) concentration increased with increasing chlorite mass fraction-likely due to ill-defined luminescence quenching by both structural Fe/Cr in chlorite, and trace amounts of solubilized and reprecipitated Fe/Cr in the aqueous phase. However, the fractional spectral intensities of U(Ⅵ) adsorbed on quartz and chlorite followed the same trend of fractional adsorbed U(Ⅵ) concentration in each mineral phase with approximate linear correlations, offering a method to estimate of U(Ⅵ) concentration distribution between the mineral components with luminescence spectroscopy.
机译：在与铀有关的铀浓度为（5×10〜（-7）M和5×5 pH 8.1合成地下水中10〜（-6）M）。随着亚氯酸盐质量分数的增加，U（Ⅵ）的吸附K_d值稳定增加，表明对亚氯酸盐的优先吸附。对于所有矿物混合物，U（Ⅵ）的吸附K_d值均低于由亚氯酸盐溶解引起的表面改性可能引起的组分加和假设得出的值。当两种矿物的质量分数相等时，偏差最大。吸附在石英和亚氯酸盐上的U（Ⅵ）表现出特征性的个体发光光谱，不受矿物混合的影响。混合物中吸附的U（Ⅵ）的光谱可以通过一种在石英上的表面U（Ⅵ）物种和在亚氯酸盐上的两种表面来模拟。随着亚氯酸盐质量分数的增加，随着U（Ⅵ）的吸附浓度的增加，发光强度呈非线性下降。这可能是由于亚氯酸盐中结构Fe / Cr和未溶解和再沉淀的痕量Fe / Cr导致的荧光猝灭导致的。在水相中。然而，在石英和亚氯酸盐上吸附的U（Ⅵ）的分数谱强度遵循每个矿物相中U（Ⅵ）浓度分数的趋势，并具有近似线性相关性，从而提供了一种估算U（Ⅵ）浓度分布的方法。矿物成分的发光光谱法。

著录项

  • 来源
    《Environmental Science & Technology》 |2014年第14期|7766-7773|共8页
  • 作者

    Zheming Wang; John M. Zachara; Jianying Shang; Choong Jeon; Juan Liu; Chongxuan Liu;

  • 作者单位

    Pacific Northwest National Laboratory, Richland, Washington 99352, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99352, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99352, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99352, United States,Department of Environmental & Applied Chemical Engineering, Gangneung-Wonju National University, Gangwon-do, Republic of Korea;

    Pacific Northwest National Laboratory, Richland, Washington 99352, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99352, 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