邻菲罗啉对蒙脱石吸附性的影响

Effect of phenanthroline on adsorption performance of montmorillonite

为了提高蒙脱石对大分子物质的吸附性,利用邻菲罗啉可与过渡金属离子形成配合物的性质,用两种方法对蒙脱石加以改性。通过测定改性蒙脱石对染料的脱色性及分析XRD图,研究邻菲罗啉的配合物的生成方式对蒙脱石层间结构及吸附性能的影响,并探讨了改性蒙脱石的热稳定性。结果表明,邻菲罗啉能够进一步撑开层间含有过渡金属离子的蒙脱石片层,使层间距明显增大到1.76nm以上;采用过渡金属离子为先驱体,先插入蒙脱石层间、再原位生成配合物的两步法能获得既增大层间距、又提高有序度的良好效果;改性蒙脱石在400℃以下具有很好的热稳定性。

The study aims at improving the adsorption performance of montmorillonite for relatively large molecules. Making use of the property that phenanthroline can form coordination compounds by reacting with the transitional metal cations, the authors modified montmorillonite by using two different methods. The effect of the formation forms of coordination compounds on the structure and the absorption performance of modified montmorillonite were studied by measuring its decolorization performance for dye and analyzing its X-ray diffraction. In this paper, the thermal stability of modified montmorillonite was investigated too. The results show that the interlayer spacing of montmorillonite can be further enhanced through the reaction of montmorillonite containing transitional metal cations with phenanthroline to reach over 1.76nm. It is shown that the two-step synthetic method, by which metal cations are introduced into the interlayer of montmorillonite and then the coordination compounds are in-situ synthesized, has a better effect. In addition, modified montmorillonite shows a fairly good thermal stability up to 400℃.