不同制备方法对水滑石性质的影响  

The Effect of Varying Synthesis Methods on Mg-Al Hydrotalcite

作　　者：张国强[1] 杨乐夫[2] 方荣谦[2] 郭德波[2] 蔡俊修[2] 

机构地区：[1]厦门大学化学工程与生物工程系 [2]厦门大学化学系

出　　处：《厦门大学学报（自然科学版）》2006年第5期673-676,共4页Journal of Xiamen University：Natural Science

基　　金：国家自然科学基金(20203014)资助

摘　　要：用XRD、SEM及热重技术分析了共沉淀法、水热法、水合再生法制备水滑石的理化性质,结果显示水热法所得产品结晶度高,一次结晶粒径大,且表面规整度高,热稳定性好;而共沉淀法易造成结晶团聚,粒径分布范围大.根据水滑石的记忆功能发展而来的水合再生法,可以实现水滑石层间不同阴离子交换,表现出“智能”化的特性.Mg-Al hydrotalcites were synthesised by coprecipitation, hydrothermal and hydro-reconstruction methods. Detailed comparative analysis of structure and morphology were made by XRD, SEM and TG-DSC techniques. It had been found that the hydrothermal treatment elevated the hydrotalcite content and significantly improved the hydrotalcite crystallinity. Meanwhile a growth of hydrotalcite crystals and a remarkable decrease of surface area were observed after hydrothermal treatment. Since a strong agglomeration of primary particles occurred during preparation, the particle size of the samples synthesized by coprecipitation distributes in a wide range. Governed by a strong edge-surface platelet interaction, these aggregates gathered in a form so-called ＂sand rose morphology＂. XRD patterns and scanning electron micrographs revealed that rehydration of the samples calcined at 450℃ resuked in the reconstruction of the layered structure,owing to its ＂memory effect＂.

关 键 词：水滑石 水热法 水合再生 

分 类 号：O643[理学—物理化学]