【摘要】 以钠基蒙脱石为原料,结合电位滴定曲线及特征临界点,将Al3+的转化划分为4种形态,并制备相应的柱撑蒙脱石。并采用X射线衍射分析、红外光谱分析及热分析对各柱撑蒙脱石进行表征,研究各柱撑蒙脱石的微结构变化及热稳定性。结果表明,Ⅲ区柱撑蒙脱石层间距d(001)值由原矿的12. 408 1 nm增加到18. 317 5 nm,同时,Ⅲ区柱撑蒙脱石Si—O伸缩振动峰强度减弱较明显,在542℃附近的蒙脱石八面体结构的脱羟基反应与原矿相比向低温区发生偏移,说明Ⅲ区柱撑蒙脱石发生了成键反应且柱撑效果最佳。更多还原

【Abstract】 Using sodium-based montmorillonite as raw material and based on the potentiometric titration curve and characteristic critical point,the authors divided the transformation of Al3 +into four morphologies,and prepared the corresponding montmorillonite. X-ray diffraction,infrared spectroscopy and thermal analysis were used. The microstructure and thermal stability of pillared montmorillonite were studied. The results show that the d( 001)value of pillared montmorillonite layer spacing in zone Ⅲ increases from 12. 408 1 to 18. 317 5 nm. Meanwhile,the strength of the Si—O stretching vibration peak of pillared montmorillonite in zone Ⅲ decreases obviously. The dehydroxylation reaction of octahedral structure of talc shifts to low temperature zone compared with that of original ore,which indicates that pillared montmorillonite in zone Ⅲ has bonding reaction and the pillared effect is the best.更多还原