羟基铝溶液及铝交联蒙脱土的研究

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。

STUDY ON HYDROXYLIC ALUMINUM SOLUTION AND ALUMINUM LINKED MONTMORILLONITE

There are many kinds of hydroxylic aluminum ions, among which [Al(H2O)6]3+, [Al2(OH)2(H2O)8D4+ and [Al13O4(OH)24(H2O) 12 ]7 + (Al137+)are detected by 27Al NMR spectrum. The relative amount of Al132+ in the detectable aluminum is increased with raise the OH/Al mole ratio. The percent of mononuclear aluminum in hydroxylic aluminum solution is determined by 8-quinolinolate extraction method. The percent of mono-nuclear aluminum is decreased due to the increase of OH/Al mole ratio. The d001 of aluminum linked montmorillonite various with the relative amount of Al137+ and the percent of mononuclear aluminum in the solution. Various kinds of pillared interlayered complex may be prepared by controlling the OH/Al mole ratio of linked solution-hydroxylic aluminum solution.