高等学校化学学报 ›› 2010, Vol. 31 ›› Issue (2): 320.

• 研究论文 • 上一篇    下一篇

四环素在海洋沉积物上的吸附

胡佶, 王江涛   

  1. 中国海洋大学, 海洋化学理论与工程技术教育部重点实验室, 青岛 266100
  • 收稿日期:2009-07-03 出版日期:2010-02-10 发布日期:2010-02-10
  • 通讯作者: 王江涛, 男, 博士, 教授, 主要从事海洋界面化学及海洋污染生态化学方面的研究. E-mail: jtwang@ouc.edu.cn
  • 基金资助:

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

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.

摘要:

研究了四环素在不同pH、盐度、温度下在海洋沉积物上的吸附特征. 结果表明, 在实验浓度范围内吸附行为都可以用线性等温式进行描述. 通过一种包含四环素3种形态与沉积物界面相互作用的模型对不同pH下的吸附常数进行拟合, 发现四环素正价态的吸附常数Kd+远大于中性态的Kd0与负价态的Kd-. 随着盐度的减小四环素在海洋沉积物上的吸附增强, 而温度的升高则不利于吸附的进行. 热力学计算结果得出, ΔG0—=-9.746~-9.713 kJ/mol; ΔH0—=-10.056 kJ/mol; ΔS0—<0, 表明该吸附过程是一个自发的、放热的熵减过程.

关键词: 四环素; 吸附; 海洋沉积物; 吸附热力学

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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