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Si/Al比对水热法合成皂石结构的影响

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Abstract:

要水热法合成的皂石,其结构特性除受到时间、温度、pH值等参数的影响外,还与铝的占位与配位形式有着直接的联系。作为一个特殊的骨架离子,铝对皂石物相的纯度、结构稳定性以及表面反应性等都起着至关重要的作用。采用水热法,固定初始物料中镁的添加量,硅与铝的添加量之和为一定值,改变Si/Al比(摩尔比),制备了一系列皂石,探究铝元素在皂石中的存在形式和微结构环境。X射线衍射分析表明铝的添加量对皂石的结晶度有着重要的影响,当Si/Al比为5.43~12.30时,皂石结晶良好。29Si、27AlNMR谱研究表明在皂石的形成过程中,铝离子和镁离子分别优先进入四面体和八面体晶格中,当Si/Al比为2.33~1.80时,铝离子进入八面体中的含量明显增多;合成皂石片层中普遍存在SiIV悬键,并出现Q2Si(OAl)信号,这与天然蒙皂石的NMR谱存在明显的区别。

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