摘要
本文利用Keggin结构可以发生类质同象置换的性质，制备了含过渡金属高于Fe的羟基铁铝往撑蒙脱石。运用紫外-可见吸收光谱、27AI核磁共振港等技术对柱化溶液中Fe和Al的状态进行了研究，运用X射线走向行射技术、红外光谱、顺磁共振等技术对柱化粘土中Keggin结构的作用及热稳定性进行了研究。结果表明，Fe／Al值对羟基铁铝柱化液的结构、d001值、柱化粘土的热稳定性均有较大的影响，随着Fe／Al值的增加，d001逐渐增大，热稳定性下降，过量的Fe对Keggin结构有破坏作用，Keggin结构的存在增加了位化粘土的热稳定性。
The pillared montmorillonite containing Fe3+ ion was prepared by substitutop Fe3+ for;Al3+ in Keggin ions which has Keggin structure. 27Al NMR and UV spectroscopy were used to;monitor the environment of Fe3+ and Al3+ in solution. The thermal stability of pillared clays was;determined by XRD, IR and EPR. The results suggest that the structure of hydroxy-Fe-Al oligo;cation, d001 values and the thermal stability of pillared clay are affected by the Fe/Al ratio in pilIared solution. The d001 values increase and the thermal stability decrease with increasing Fe/Al ratio. Excessive amounts of Fe3+ ions can destroy the Keggin structure. The existence of Keggin;structure can improve the thermal stability of the pillared clays.
出处
《矿物学报》
CAS
CSCD
北大核心
1999年第2期132-138,共7页
Acta Mineralogica Sinica
基金
国家自然科学基金!49472089
广东省自然科学基金!940732
