...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Kinetics of Ni Sorption in Soils: Roles of Soil Organic Matter and Ni Precipitation
【24h】

Kinetics of Ni Sorption in Soils: Roles of Soil Organic Matter and Ni Precipitation

机译：镍在土壤中的吸附动力学：土壤有机质和镍沉淀的作用

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 kinetics of Ni sorption to two Delaware agricultural soils were studied to quantitatively assess the relative importance of Ni adsorption on soil organic matter (SOM) and the formation of Ni layered double hydroxide (Ni-LDH) precipitates using both experimental studies and kinetic modeling. Batch sorption kinetic experiments were conducted with both soils at pH 6.0, 7.0, and 7.5 from 24 h up to 1 month. Time-resolved Ni speciation in soils was determined by X-ray absorption spectroscopy (XAS) during the kinetic experiments. A kinetics model was developed to describe Ni kinetic reactions under various reaction conditions and time scales, which integrated Ni adsorption on SOM with Ni-LDH precipitation in soils. The soil Ni speciation (adsorbed phases and Ni-LDH) calculated using the kinetics model was consistent with that obtained through XAS analysis during the sorption processes. Under our experimental conditions, both modeling and XAS results demonstrated that Ni adsorption on SOM was dominant in the short term and the formation of Ni-LDH precipitates accounted for the long-term Ni sequestration in soils, and, more interestingly, that the adsorbed Ni may slowly transfer to Ni-LDH phases with longer reaction times.
机译：研究了两个特拉华州农业土壤对镍的吸附动力学，以定量评估镍在土壤有机质（SOM）和镍层状双氢氧化物（Ni-LDH）沉淀物形成过程中的相对重要性，并同时进行了实验研究和动力学建模。从24小时到1个月，分别在pH 6.0、7.0和7.5的两种土壤上进行分批吸附动力学实验。在动力学实验过程中，通过X射线吸收光谱法（XAS）确定了土壤中时间分辨的镍形态。建立了动力学模型来描述在各种反应条件和时间尺度下的镍动力学反应，该模型将镍在SOM上的吸附与土壤中Ni-LDH的沉淀结合在一起。使用动力学模型计算的土壤镍形态（吸附相和Ni-LDH）与在吸附过程中通过XAS分析获得的形态一致。在我们的实验条件下，建模和XAS结果均表明，短期内SOM上的Ni吸附占主导地位，Ni-LDH沉淀物的形成是土壤中长期固存Ni的原因，更有趣的是，Ni被吸附可能会以较长的反应时间缓慢转移到Ni-LDH相。

著录项

  • 来源
    《Environmental Science & Technology》 |2012年第4期|p.2212-2219|共8页
  • 作者

    Zhenqing Shi; Edward Peltier; Donald L. Sparks;

  • 作者单位

    Environmental Soil Chemistry Research Group, Department of Plant and Soil Sciences, 152 Townsend Hall, University of Delaware,Newark, Delaware 19717-1303, United States,School of Earth and Environmental Science, Washington State University, Pullman, WA;

    Department of Civil, Environmental & Architectural Engineering, University of Kansas, 1530 West 15th Street, Lawrence, Kansas 66045-7609, United States;

    Environmental Soil Chemistry Research Group, Department of Plant and Soil Sciences, 152 Townsend Hall, University of Delaware,Newark, Delaware 19717-1303, 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