| 不同离子桥键的有机矿质复合体对菲的吸附-解吸研究 |
| 摘要点击 2889 全文点击 1981 投稿时间：2007-12-20 修订日期：2008-03-28 |
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| 中文关键词 菲 有机矿质复合体 桥键离子 吸附-解吸 |
| 英文关键词 phenanthrene organo-mineral complex bridge cations sorption-desorption |
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| 中文摘要 |
| 从自然土壤中有机质与矿物的结合方式出发，研究了Ca2+、Fe3+和Al3+桥键的有机矿质复合体对菲的吸附-解吸行为.结果表明，不同离子饱和的蒙脱石及其相应的胡敏酸-矿物复合体对菲的吸附-解吸数据都能用Freundlich模型较好地拟合，吸附容量（Kf）大小的顺序分别为Ca-Mont（0.184）>Fe-Mont（0.028）>Al-Mont（0.015）和Fe-Mont-HA（2.341）>Ca-Mont-HA（1.557）>Al-Mont-HA（1.136）.有机矿质复合体的Kf值远远高于相应的矿物，表明了复合体中的胡敏酸对菲的吸附容量贡献较大.但不同离子桥键的复合体Kf值的大小与它们有机质的含量高低次序不一致，表明了复合体中有机质的含量以及有机质与矿物结合方式的不同，都可能会影响它们对菲的吸附.Ca2+和Al3+桥键的有机矿质复合体对菲的解吸都有滞后现象，滞后现象主要来自有机质对菲的吸附，而矿物对菲的解吸滞后现象影响不明显. |
| 英文摘要 |
| Sorption and desorption of phenanthrene by organo-mineral complexes with Ca2+，Fe3+ and Al3+ as bridge cations were studied according to the association type between organic matter and minerals in natural soils.The results showed that the data of phenanthrene sorption and desorption by different cation saturated montmorillonite and their corresponding humic acid and mineral complexes could be fitted with Freundlich model，and the order of the sorption capacities (Kf) were Ca-Mont (0.184)> Fe-Mont (0.028)> Al-Mont (0.015) and Fe-Mont-HA (2.341)> Ca-Mont-HA (1.557)> Al-Mont-HA (1.136)，respectively.The Kf values of humic acid and mineral complexes were far greater than those of minerals，which demonstrated that humic acid made great contributions to the sorption of phenanthrene in the organo-mineral complexes.However，the Kf values of the organo-mineral complexes with different bridge cations were not consistent with their organic carbon content，which indicated that both the organic carbon content and the combined types between organic matter and mineral could affect the sorption capacity of phenanthrene by the organo-mineral complexes.The desorption hysteresis of phenanthrene was significant for Ca2+ and Al3+ bridged organo-mineral complexes.Desorption hysteresis of phenanthrene was mainly from the sorption of phenanthrene by organic matter，and the contributions of mineral to the desorption hysteresis were not significant. |
