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固液相离子吸附体系中吸附剂浓度效应与Langmuir方程的适用性

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赵芳, 吴晓芙, 张艳丽, 黄中子. 固液相离子吸附体系中吸附剂浓度效应与Langmuir方程的适用性[J]. 环境化学, 2007, 26(3): 335-338.
引用本文: 赵芳, 吴晓芙, 张艳丽, 黄中子. 固液相离子吸附体系中吸附剂浓度效应与Langmuir方程的适用性[J]. 环境化学, 2007, 26(3): 335-338.
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ZHAO Fang, WU Xiao-fu, ZHANG Yan-li, HUANG Zhong-zi. ADSORBENT EFFECT AND APPLICABILITY OF LANGMUIR EQUATION FOR DESCRIBING ION ADSORPTION IN LIQUID/SOLID SYSTEMS[J]. Environmental Chemistry, 2007, 26(3): 335-338.
Citation: ZHAO Fang, WU Xiao-fu, ZHANG Yan-li, HUANG Zhong-zi. ADSORBENT EFFECT AND APPLICABILITY OF LANGMUIR EQUATION FOR DESCRIBING ION ADSORPTION IN LIQUID/SOLID SYSTEMS[J]. Environmental Chemistry, 2007, 26(3): 335-338.
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固液相离子吸附体系中吸附剂浓度效应与Langmuir方程的适用性

  • 1.

    中南林业科技大学理学院, 株洲, 412006;

  • 2.

    上海工程技术大学化学化工学院, 上海, 201600

  • 基金项目:

    948项目(2005-02)

    湖南省教育厅产业化推广项目(湘教发2003-101)资助.

ADSORBENT EFFECT AND APPLICABILITY OF LANGMUIR EQUATION FOR DESCRIBING ION ADSORPTION IN LIQUID/SOLID SYSTEMS

  • 1.

    Central South University of Forestry & Technology, Zhuzhou, 412006, China;

  • 2.

    Shanghai University of Engineering Science, Shanghai, 201600, China

  • Fund Project:

  • 摘要: 以蛭石吸附Zn2+和Cd2+为例,探讨Langmuir方程在固液相离子吸附体系中的适用性,结果表明:传统吸附等温线随吸附剂浓度Wo增大而下降,吸附量qe不仅仅由液相平衡浓度Ce所决定,而是Ce和Wo两个变量的函数;以Langmuir方程的线性形式对实验数据进行拟合,在给定吸附剂浓度水平下的实验数据与Langmuir方程拟合的相关性很好,但方程中的两个参数随吸附剂浓度增大而降低而且差异显著,表明Lang-muir方程仅适用于给定吸附剂浓度的体系,采用单一参数的Langmuir方程难以准确描述试验检测范围内Zn2+和Cd2+的吸附规律.
    Abstract: Experiments of Zn2+and Cd2+adsorptions on vermiculite were conducted to test the applicability of Langmuir equation for describing ion adsorption in liquid/solid systems.The results showed that the traditionally defined equilibrium adsorption isotherm decreased with increasing adsorbent concentration Wo,indicating that the equilibrium ion adsorption density qe is not a single function of the equilibrium ion concentration in liquid phase Ce but a function of both Ce and Wo.The Langmuir equation was found to fit the experimental data well for both Zn2+ and Cd2+only at given adsorbent concentration levels.The defined equation parameters varied significantly with a general trend towards decrease with increasing adsorbent concentration.The present findings suggest that unless the adsorbent concentration is kept constant,a single Langmuir-type equation can not be applied to describe Zn2+ and Cd2+ adsorption in the liquid/solid system.
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  • 收稿日期:  2006-08-18
  • 刊出日期:  2007-05-27

固液相离子吸附体系中吸附剂浓度效应与Langmuir方程的适用性

  • 1.  中南林业科技大学理学院, 株洲, 412006;
  • 2.  上海工程技术大学化学化工学院, 上海, 201600
  • 收稿日期:  2006-08-18
基金项目:

948项目(2005-02)

湖南省教育厅产业化推广项目(湘教发2003-101)资助.

摘要: 以蛭石吸附Zn2+和Cd2+为例,探讨Langmuir方程在固液相离子吸附体系中的适用性,结果表明:传统吸附等温线随吸附剂浓度Wo增大而下降,吸附量qe不仅仅由液相平衡浓度Ce所决定,而是Ce和Wo两个变量的函数;以Langmuir方程的线性形式对实验数据进行拟合,在给定吸附剂浓度水平下的实验数据与Langmuir方程拟合的相关性很好,但方程中的两个参数随吸附剂浓度增大而降低而且差异显著,表明Lang-muir方程仅适用于给定吸附剂浓度的体系,采用单一参数的Langmuir方程难以准确描述试验检测范围内Zn2+和Cd2+的吸附规律.

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