Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (2): 320.

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Adsorption of Tetracycline on Marine Sediment

HU Ji, WANG Jiang-Tao*   

  1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
  • Received:2009-07-03 Online:2010-02-10 Published:2010-02-10
  • Contact: WANG Jiang-Tao. E-mail: jtwang@ouc.edu.cn
  • Supported by:

    山东省自然科学基金(批准号: SD-908-01-01-05.06) 资助.

Abstract:

Adsorption interactions of tetracycline with marine sediment were investigated under varied pH and salinity and temperatures conditions. Adsorption behavior could be fitted with linear isotherms very well over the concentration range .Adsorption edges were best described with a model, which included interactions between positive form, zwitterion form and negative form of tetracycline and marine sediment interface. It showed that the value of Kd+ was higher than Kd0 and Kd-. The adsorption was favorably influenced by decreasing salinity of seawater, but negatively by increasing temperatures. The result of thermodynamic function calculation showed that the change of Gibbs free energy ΔG0—=-9.746—-9.713 kJ/mol , the enthalpy change ΔH0—=-10.056 kJ/mol and the entropy change ΔS0—<0 for the sorption. It indicated that the adsorption was a spontaneous and exothermic process which accompanied a decrease in the degree of freedom.

Key words: Tetracycline; Adsorption; Marine sediment; Adsorption thermodynamics

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