直接置换插层法0.85 nm水合高岭石的制备

以高岭石/尿素插层复合物作为中间相,利用简单的直接置换插层法制备了d001=0.85 nm的水合高岭石。利用X射线衍射、红外光谱、扫描电镜表征处理前后高岭石结构与形貌的变化。结果表明:尿素插层后的高岭石层间距从d001=0.72 nm增大到d001=1.08 nm,经不同温度酸洗或水洗后,插层复合物转变成层间有水分子的水合高岭石(d001=0.85 nm),且高岭石晶粒厚度明显从约25 nm减小到约10 nm。在高温条件下形成的水合高岭石含量最高,90℃水洗时d001=0.85 nm水合高岭石的转化率接近70%,这种水合高岭石具有进一步的置换插层能力,是一种制备其他高岭石插层复合物很好的前驱体。与乙二醇形成d001=1.10nm乙二醇/高岭石插层复合物,其置换率达到100%。

Preparation of 0.85 nm Hydrated Kaolinite by Direct Displacement Intercalation

The hydrated kaolinite with d001=0.85 nm was prepared with simple direct displacement intercalation method by using kaolinite-urea intercalation compound as an intermediate.The microstructure and morphology of kaolinite before and after intercalation were characterized by X-ray diffraction,infrared spectroscopy and scanning electron microscopy.The results show that the basal spacing of the kaolinite increases from d001=0.72 nm to d001=1.08 nm after intercalation with urea.After being grafted with water thro...