(Sm,Ce)/Zr基柱撑蒙脱石的微结构特征

Microstructure characteristics of (Ce, Sm)/Zr-pillared montmorillonite

室温条件下 ,在锆基的基础上加入其他金属离子配制了 (Sm ,Ce) /Zr基柱化剂。用该聚合阳离子柱撑钙基蒙脱石 ,室温下d0 0 1值为 2 .1～ 2 .3nm ,焙烧 30 0℃后 ,d0 0 1值为 1.8nm ,衍射峰敏锐对称 ,说明柱撑蒙脱石的热稳定性超过 30 0℃。FTIR分析结果表明 (Sm ,Ce) /Zr基柱化剂和蒙脱石的Si—O四面体层形成了稳定的 [Si—O]— [H(O)—Zr(Sm ,Ce) ]键 ,从结构上解释了 (Sm ,Ce) /Zr基柱撑蒙脱石材料结构稳定的机理。

The (Ce,Sm)/Zr-pillared montmorillonite clay which is thermally stable at 300℃ can be obtained from ZrOCl-2·8H-2O solution by adding (Ce,Sm) cations, and d-(001) values are 2.1～2.3 nm at room temperature, 1.8～1.9 nm at 300℃. FTIR analysis shows that relatively strong chemical bonds of ([Si—O]—[H(O)—Zr(Ce,Sm)]) are formed between (Ce,Sm)/Zr polycations and Si—O tetrahedral sheets of the clay minerals. It is therefore held that (Ce,Sm)/Zr-pillared montmorillonite has a stable structure.