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Thermodynamics of tetracycline adsorption on silica

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Abstract

The adsorption of antibiotic tetracycline onto silica particles was investigated. The effects of pH, electrolyte concentration and temperature on the adsorption equilibrium were examined and the data correlated with a dual site adsorption model. Adsorption of tetracycline onto approximately 9% of the adsorption sites was found to be irreversible, whereas the rest exhibited Langmuir behaviour. Increasing pH of the solution had a strong negative effect on the adsorbed amounts. Adsorption decreased also with increasing ionic strength and temperature. The enthalpy and entropy of adsorption were found to be approximately −16 and −25 J/mol, respectively.

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Acknowledgment

Irina Turku gratefully acknowledges a personal grant from the Research Foundation of Lappeenranta University of Technology.

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Authors and Affiliations

  1. Laboratory of Industrial Chemistry, Lappeenranta University of Technology, P.O. Box 20, 53851, Lappeenranta, Finland

    I. Turku, T. Sainio & E. Paatero

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  1. I. Turku
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  2. T. Sainio
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  3. E. Paatero
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Correspondence to I. Turku.

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Turku, I., Sainio, T. & Paatero, E. Thermodynamics of tetracycline adsorption on silica. Environ Chem Lett 5, 225–228 (2007). https://doi.org/10.1007/s10311-007-0106-1

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  • DOI: https://doi.org/10.1007/s10311-007-0106-1

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