采用溶液浸泡法制备地开石—醋酸钾插层复合物,利用热重-差热仪(TG-DSC)分析复合物的热稳定性,X射线衍射(XRD)、傅里叶红外光谱仪(FTIR)和场发射扫描电镜(FESEM)研究热处理温度对样品稳定性的影响.结果表明,热处理过程中的变化包括:3 00℃以下的低温反应阶段,吸附水脱去并伴随醋酸根离子烧失,d(002)由1.41 nm变成0.908 nm,再缩小至膨胀前的0.717 nm;400 ～900℃的中温反应,此阶段主要发生脱羟基作用,变成无定型偏地开石;900℃以上的高温反应,即固态相变阶段,生成莫来石和方石英.研究发现,地开石—醋酸钾热处理后,偏地开石的转变温度降低200℃左右,奠来石的相变转变温度升高30℃.
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