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摘要
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 K-d(+) was higher than K-d(0) and K-d(-). 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 Delta G = -9.746- - 9.713 kJ/mol, the enthalpy change Delta H = - 10.056 kJ/mol and the entropy change Delta S < 0 for the sorption. It indicated that the adsorption was a spontaneous and exothermic process which accompanied a decrease in the degree of freedom.
- 出版日期2010-2-10
- 单位中国海洋大学
