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首页> 外文期刊>Environmental Science & Technology >Adsorption Kinetics of Toluene on Soil Agglomerates: Soil as a Biporous Sorbent
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Adsorption Kinetics of Toluene on Soil Agglomerates: Soil as a Biporous Sorbent

机译：甲苯在土壤团聚体上的吸附动力学：土壤作为双孔吸附剂

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摘要

Single-component vapor diffusion at low pressure into dry soil agglomerates provides a well-characterized system for investigating adsorption and diffusion mechanisms. Equilibrium and kinetic data for adsorption of toluene vapor on Yolo loam and montmorillonite clay were obtained in this study with a gravimetric method. More extensive equilibrium data were obtained with a headspace gas chromatographic technique. Freundlich isotherms provided a good fit to the equilibrium data for relative partial pressures less than 0.6. Adsorption of toluene from the gas phase occurred in two stages: the first was due to fast diffusion and adsorption in macropores, and the second was controlled by slower diffusion and adsorption in intragrain micropores. As several days are required to establish equilibrium, the effect of slow diffusion and adsorption would be overlooked in shorter studies. Numerical simulations described the isothermal adsorption of toluene on spherical soil particles subject to a step change in bulk concentration. Biporous diffusion models are necessary to interpretthe distinct diffusional characteristics of toluene in macropores and micropores with nonlinear adsorption. The simulations quantitatively describe details of the adsorption history.
机译：低压下单组分蒸气扩散到干燥土壤团聚体中，为研究吸附和扩散机理提供了功能完备的系统。本研究采用重量法获得了甲苯在Yolo壤土和蒙脱土上的吸附平衡和动力学数据。使用顶空气相色谱技术可获得更广泛的平衡数据。当相对分压小于0.6时，Freundlich等温线非常适合平衡数据。气相中甲苯的吸附分为两个阶段：第一个阶段是由于大孔中的快速扩散和吸附，第二个阶段是由颗粒内微孔中的较慢的扩散和吸附所控制。由于需要几天的时间才能建立平衡，因此在较短的研究中将忽略缓慢扩散和吸附的影响。数值模拟描述了甲苯在球状土壤颗粒上的等温吸附，随着体积浓度的逐步变化。双孔扩散模型对于解释甲苯在具有非线性吸附的大孔和微孔中的独特扩散特性是必要的。模拟定量描述了吸附历史的细节。

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  • 来源
    《Environmental Science & Technology》 |1996年第5期|p.1500-1507|共8页
  • 作者

    MARCO A. AROCHA; ALAN P. JACKMAN; BEN J. MCCOY;

  • 作者单位

    Department of Chemical Engineering and Materials Science, University of California, Davis, Davis, California 95616;

  • 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 环境化学;
  • 关键词

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