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本文用(27)~Al NMR法和8-羟基喹啉萃取法分别研究了羟基铝溶液中十三聚铝含量的变化规律,还用X-射线衍射法研究了铝交联蒙脱土d_(001)的变化。研究结果表明,铝离子的聚合情况主要由羟铝比决定,而浓度影响不大。随着羟铝比的增加,溶液中单核铝离子含量减少,十三聚铝离子相对含量增加,所得铝交联蒙脱土的d_(001)也随之增大。参照这些变化规律、控制羟基铝溶液的组成,可以制备各种层柱状铝交联蒙脱土复合物。
In this paper, the changes of the content of tridecamethyl aluminum in aluminum hydroxyapatite solution were studied by using (27) ~ Al NMR and 8-hydroxyquinoline extraction methods, respectively. The effects of aluminum cross-linked montmorillonite d_ ( 001) changes. The results show that the polymerization of aluminum ions is mainly determined by the ratio of aluminum and aluminum, while the concentration has little effect. With the increase of the ratio of aluminum to aluminum, the content of mononuclear aluminum ions in the solution decreased and the relative content of tridecyl aluminum ions increased. As a result, the d_ (001) of the obtained aluminum-crosslinked montmorillonite increased. With reference to these changes, the composition of the aluminum hydroxide solution can be controlled, and various layers of columnar aluminum-crosslinked montmorillonite composite can be prepared.