| pH及表面活性剂对诺氟沙星在海洋沉积物上吸附行为的影响 |
| 摘要点击 2784 全文点击 1408 修订日期：2011-05-26 |
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| 中文关键词 诺氟沙星 吸附 海洋沉积物 表面活性剂 pH |
| 英文关键词 norfloxacin(NOR) sorption marine sediments surfactants pH |
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| 中文摘要 |
| 采用批量平衡法系统考察了pH值和4种表面活性剂对诺氟沙星在海洋沉积物上吸附行为的影响.结果表明,不同pH值下,诺氟沙星在海洋沉积物上的吸附行为均可以较好地用Freundlich等温式拟合.Freundlich常数KF与诺氟沙星的平衡吸附量均随pH值的增大而减小,且在pH值为8.10时,出现最小值; 研究发现,pH值为6.01时,诺氟沙星以阳离子交换为主要机制吸附在海洋沉积物上; pH值为8.10时,诺氟沙星在海洋沉积物中的吸附以范德华力、疏水作用、静电作用为主.加入表面活性剂后,其吸附行为能较好地用吸附二级动力学方程拟合.加入表面活性剂对诺氟沙星的平衡吸附量Qe有影响,饱和吸附量Qe由小到大依次为:Qe(Tween80)<Qe(Tween20)<Qe(无)<Qe(CTAB)<Qe(SDBS). |
| 英文摘要 |
| The adsorption behaviors of norfloxacin (NOR) on marine sediments at different pH values and in the presence of four different surfactants were systematically investigated by a batch equilibrium method. The results indicated that Freundlich adsorption isotherms fitted the adsorption behavior of NOR on marine sediments very well at different pH values. The Freundlich constant KF and the equilibrium adsorption amount of NOR reduced with the increase of pH values, and the minimum appeared at pH 8.10. The results suggested that cation exchange was the main adsorption mechanism of NOR at pH 6.01, while Van der Waals' force, hydrophobic effects, electrostatic force were the major adsorption mechanism of NOR on marine sediments at pH 8.10. The adsorption process fitted well with pseudo-second-order kinetic equations with the addition of surfactants. Our study also indicated that the addition of surfactants had the significant influence on the saturated adsorption amount of adsorption of NOR. The equilibrium adsorption amount (Qe) of NOR exhibited the following sequence: Qe(Tween80)<Qe(Tween20)<Qe(No)<Qe(CTAB)<Qe(SDBS). |
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