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首页> 外文期刊>Environmental Science & Technology >Influence of Smectite Hydration and Swelling on Atrazine Sorption Behavior
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Influence of Smectite Hydration and Swelling on Atrazine Sorption Behavior

机译：蒙脱石水化膨胀对on去津吸附行为的影响

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摘要

Smectites,clay minerals commonly found in soils and sediments,vary widely in their ability to adsorb organic chemicals.Recent research has demonstrated the importance of surface charge density and properties of exchangeable cations in controlling the affinity of smectites for organic molecules.In this study,we induced hysteresis in the crystalline swelling of smectites to test the hypothesis that the extent of crystalline swelling (or interlayer hydration status) has a large influence on the ability of smectites to adsorb atrazine from aqueous systems.Air-dried K-saturated Panther Creek (PC) smectite swelled less (d(001)=1.38 nm) than never-dried K-PC (d(001)=1.7 nm) when rehydrated in 20 mM KCl.Correspondingly,the air-dried-rehydrated K-PC had an order of magnitude greater affinity for atrazine relative to the never-dried K-PC.Both air-dried-rehydrated and never-dried Ca-PC expanded to approximately 2.0 nm in 10 mM CaCl_2 and both samples had similar affinities for atrazine that were slightly lower than that of never-dried K-PC.The importance of interlayer hydration status in controlling sorption affinity was confirmed by molecular modeling,which revealed much greater interaction between interlayer water molecules and atrazine in a three-layer hydrate relative to a one-layer hydrate.The entropy change on moving atrazine from a fully hydrated state in the bulk solution to a partially hydrated state in the smectite interlayers is believed to be a major factor influencing sorption affinity.In an application test,choice of background solution (20 mM KCI versus 10 mM CaCl_2 and air-drying treatments significantly affected atrazine sorption affinities for three-smectitic soils;however,the trends were not consistent with those observed for the reference smectite.Further,extending the initial rehydration time from 24 to 240 h (prior to adding atrazine) significantly decreased the soil's sorption affinity for atrazine.We conclude that interlayer hydration status has a large influence on the affinity of smectites for atrazine and that air-drying treatments have the potential to modify the sorption affinity of smectitic soils for organic molecules such as atrazine.
机译：绿土，常见于土壤和沉积物中的粘土矿物吸附有机化学物质的能力千差万别。最近的研究表明，表面电荷密度和可交换阳离子的性质在控制绿土对有机分子的亲和力方面很重要。我们在蒙脱石的晶体溶胀中引入了滞后作用，以检验以下假设的假设：晶体溶胀的程度（或层间水合状态）对蒙脱石吸附水性系统中at去津的能力有很大影响。风干的K饱和Panther Creek（ PC）蒙脱石在20 mM KCl中复水后的溶胀（d（001）= 1.38 nm）比从未干燥的K-PC（d（001）= 1.7 nm）少。相应地，风干复水的K-PC具有相对于从未干燥的K-PC，对at去津的亲和力更大。在10 mM CaCl_2中，风干，再水化和从未干燥的Ca-PC都扩展到约2.0 nm，并且两个样品对azine去津的亲和力相似分子模型证实了层间水合状态在控制吸附亲和力中的重要性，这表明三层水合物中的层间水分子与r去津之间的相互作用要比单层水相大得多。在将蒙脱石中间层中的r去津从完全水合状态迁移到蒙脱石中间层的部分水合状态时，熵的变化被认为是影响吸附亲和力的主要因素。在应用测试中，背景溶液的选择（20 mM KCI对比10 mM CaCl_2和风干处理显着影响三-石土壤的r去津吸附亲和力;但是，该趋势与参考蒙脱石观察到的趋势不一致。此外，将初始水化时间从24小时延长至240小时（之前） （添加阿特拉津）显着降低了土壤对阿特拉津的吸附亲和力。影响绿土对阿特拉津的亲和力，风干处理有可能改变绿土对有机分子如阿特拉津的吸附亲和力。

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  • 来源
    《Environmental Science & Technology》 |2005年第9期|p.3150-3156|共7页
  • 作者

    MARK A.CHAPPELL; DAVID A.LAIRD; MICHAEL L.THOMPSON; HUI LI; BRIAN J.TEPPEN; VANEET AGGARWAL; CLIFF T.JOHNSTON; STEPHEN A.BOYD;

  • 作者单位

    Department of Agronomy,Agronomy Hall,Iowa State University,Ames,Iowa,50011,National Soil Tilth Laboratory,USDA-ARS,Ames,Iowa,50011,Department of Agronomy,Agronomy Hall,Iowa State University,Ames,Iowa,50011,Department of Crop and Soil Sciences,Michiga;

    Department of Agronomy,Agronomy Hall,Iowa State University,Ames,Iowa,50011,National Soil Tilth Laboratory,USDA-ARS,Ames,Iowa,50011,Department of Agronomy,Agronomy Hall,Iowa State University,Ames,Iowa,50011,Department of Crop and Soil Sciences,Michiga;

    Department of Agronomy,Agronomy Hall,Iowa State University,Ames,Iowa,50011,National Soil Tilth Laboratory,USDA-ARS,Ames,Iowa,50011,Department of Agronomy,Agronomy Hall,Iowa State University,Ames,Iowa,50011,Department of Crop and Soil Sciences,Michiga;

    Department of Agronomy,Agronomy Hall,Iowa State University,Ames,Iowa,50011,National Soil Tilth Laboratory,USDA-ARS,Ames,Iowa,50011,Department of Agronomy,Agronomy Hall,Iowa State University,Ames,Iowa,50011,Department of Crop and Soil Sciences,Michiga;

    Department of Agronomy,Agronomy Hall,Iowa State University,Ames,Iowa,50011,National Soil Tilth Laboratory,USDA-ARS,Ames,Iowa,50011,Department of Agronomy,Agronomy Hall,Iowa State University,Ames,Iowa,50011,Department of Crop and Soil Sciences,Michiga;

    Department of Agronomy,Agronomy Hall,Iowa State University,Ames,Iowa,50011,National Soil Tilth Laboratory,USDA-ARS,Ames,Iowa,50011,Department of Agronomy,Agronomy Hall,Iowa State University,Ames,Iowa,50011,Department of Crop and Soil Sciences,Michiga;

    Department of Agronomy,Agronomy Hall,Iowa State University,Ames,Iowa,50011,National Soil Tilth Laboratory,USDA-ARS,Ames,Iowa,50011,Department of Agronomy,Agronomy Hall,Iowa State University,Ames,Iowa,50011,Department of Crop and Soil Sciences,Michiga;

    Department of Agronomy,Agronomy Hall,Iowa State University,Ames,Iowa,50011,National Soil Tilth Laboratory,USDA-ARS,Ames,Iowa,50011,Department of Agronomy,Agronomy Hall,Iowa State University,Ames,Iowa,50011,Department of Crop and Soil Sciences,Michiga;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
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