肼对高岭土插层的研究(Ⅱ)——高岭土结构对插层的影响

Study on Hydrazine Intercalation of Kaolinite (Ⅱ) ——Effects of Structure and Morphology of Kaolinites on Intercalation

研究了不同结构形态的高岭土———层片状的茂名土和管状结构的苏州土以及高岭土颗粒尺寸对肼插层的影响 ,发现结构开放程度较小的苏州土较茂名土的肼插层速率和插层度低 ,并且存在着明确的肼的高、低浓度插层阈值 ,但它们的最佳插层肼浓度相同 .颗粒尺寸小的高岭土的插层能力比颗粒尺寸大的低 ,用结晶完整性随颗粒尺寸增大而增大解释了这一现象 .因此 ,肼对高岭土的插层难易应综合考虑高岭土结构的开放程度。

Effects of the structure and morphology of kaolinites on hydrazine intercalation rate were investigated. It was found that the intercalation rate and the intercalating yield for the tubulose morpho logy Suzhou kaolinite is less than that for the platelike Maoming kaolinite which have more open structure. There exist definite high and low concentration thresholds of hydrazine solution in effective intercalation for Suzhou clay, differing from Maoming clay which has only a low hydrazine concentration limit. However, they have same optimum hydrazine concentration for the highest intercalation rate. The clay with smaller particle size is found more difficult to be intercalated. This phenomenon, discrepant with common sense, is interpreted by the increasing crystal perfection of clay with larger particles. Therefore, the ease of hydrazine intercalation into kaolinite must be measured comprehensively by the structural openness, the weakness of bonding force between layers and the crystal perfection of kaolinite.