| 直接置换插层法0.85 nm水合高岭石的制备 |
| Preparation of 0.85 nm Hydrated Kaolinite by Direct Displacement Intercalation |
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| 摘要: 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=1.10 nm乙二醇/高岭石插层复合物，其置换率达到100%。 |
| 关键词: 高岭石 插层 插层前驱体 水合高岭石 |
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| Abstract: 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 through washing with acid or water at different temperatures, the hydrated kaolinite with d001=0.85 nm is obtained. And the grain thickness of kaolinite decreases significantly from 25 nm to about 10 nm. The highest content of the hydrated kaolinite appears at high temperature, which is nearly 70% by washing with water at 90 ℃. The d001=0.85 nm hydrated kaolinite derived from kaolinite-urea compound has further intercalation ability, and may serve as an excellent precursor for preparing other kaolinite intercalation compounds. The transformation rate of about 100% can be obtained for kaolinite- ethylene glycol intercalation compound from the hydrated kaolinite. |
| Keywords: kaolinite intercalation intercalation precursor hydrated kaolinite |
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| 徐剑锋,梁怡瑛,马 宁,陈丽昆,李 勇,杜丕一.直接置换插层法0.85 nm水合高岭石的制备[J].无机化学学报,2011,27(6):1121-1127. |
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