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A sorbent concentration-dependent Freundlich isotherm

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Abstract

During study of the adsorption isotherms at solid–liquid interfaces, a sorbent concentration effect (C s-effect) phenomenon was observed. In order to describe the C s-effect, we proposed a new adsorption model, i.e., surface component activity (SCA) model. It supposes that the interaction between the sorbent particles exists in the real adsorption system, which induces the deviation of a real adsorption system from an ideal one. It is the deviation that induces the emerging of the C s-effect. Based on the SCA model, the activity coefficient of adsorption sites should be a function of the sorbent concentration (C s), and a C s-dependent Freundlich equation (Freundlich-SCA equation) was derived. It was confirmed that the Freundlich-SCA equation can describe the C s-effect observed in adsorption experiments. Its parameters (n S and K S) can be simulated with experimental adsorption data and are independent of C s. Thus, these parameters obtained at given C s values can be used to predict the adsorption behavior of the adsorbate at any C s value.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 21173135), the Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20110131130008), the Taishan Scholar Foundation of Shandong Province of China (No. ts20070713), and the Graduate Independent Innovation Foundation of Shandong University (No. yzc10112).

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Authors and Affiliations

  1. Environment Research Institute, Shandong University, Jinan, 250100, People’s Republic of China

    Ling-Xi Zhao

  2. Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University, Jinan, 250100, People’s Republic of China

    Shu-E Song, Na Du & Wan-Guo Hou

  3. State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, People’s Republic of China

    Wan-Guo Hou

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  1. Ling-Xi Zhao
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  2. Shu-E Song
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  3. Na Du
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  4. Wan-Guo Hou
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Correspondence to Wan-Guo Hou.

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Zhao, LX., Song, SE., Du, N. et al. A sorbent concentration-dependent Freundlich isotherm. Colloid Polym Sci 291, 541–550 (2013). https://doi.org/10.1007/s00396-012-2742-7

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  • DOI: https://doi.org/10.1007/s00396-012-2742-7

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