【摘要】 通过采用吸潮法制备出了插层率约为90%的高岭石醋酸钾插层复合物。利用X射线衍射和红外光谱研究了插层前后高岭石结构的变化。在本文实验结果和国内外已有的研究结果基础上,综合考察了各种可能性,提出醋酸根离子首先与水分子配位结合,配位体中的水分子再与内表面铝羟基以氢键形式相结合。结合理论结构计算,推断水合K+离子处于醋酸根中的甲基和硅氧面的复三方孔之间,并且水合K+离子部分处于复三方孔中,进而提出了全新的醋酸钾插层高岭石的作用机理模型,结果表明该模型的理论计算值与实验结果具有很好的一致性。更多还原

【Abstract】 The kaolinite intercalated with potassium acetate with about 90% intercalation ratio was prepared by moisture-absorbing method at room temperature. The structure of kaolinite before and after being intercalated was characterized by XRD and IR. According to the experiment and previous research results, many possibilities were studied. It was proved that acetate ions were coordinated to water molecules firstly, and then the water molecules in the hydrated group were bonded to the inner surface hydroxyls by hydrogen bonding. It was suggested that the hydrated K~+ cation stayed between the methyl of acetate ion and the ditrigonal space of siloxane layer, and the hydrated K~+ cation partly keys into the ditrigonal space by structural computation in theory. A novel model was provided to analyze the possible mechanism of potassium acetate intercalating into kaolinite. The results show that computation data is in good agreement with experimental data.更多还原