Zn-Al类水滑石的合成及表征  

Synthesis and Characterization of Zn-Al Hydrotalcite-like Compounds

作　　者：李丽芳[1] 侯万国[1] 刘春霞[1] 戴肖南[1] 

机构地区：[1]山东大学胶体与界面化学教育部重点实验室

出　　处：《精细化工》2004年第3期161-164,170,共5页Fine Chemicals

基　　金：国家自然科学基金资助项目(No.20273041)

摘　　要：用液相非稳态共沉淀法合成了Zn Al类水滑石(HTlc),研究了样品中n(Al)/n(Zn+Al)(x)和层间阴离子CO2-3对Zn Al HTlc化学组成、晶体结构和粒子形貌的影响。结果表明,当0 31≤x≤0 52时可得到单一的Zn Al Cl HTlc相;x≤0 25时有ZnO杂质相出现;x>0 52时样品主要以无定形物存在。x对晶胞参数a和c影响不大;与Cl-相比,层间CO2-3对a影响不大,使c值略有降低。透射电镜(TEM)结果表明,随每摩尔HTlc样品n(Zn)增加,Zn Al ClHTlc粒子六角形片状结构规则度增加。电子衍射图谱表明,所合成的HTlc样品均为六方晶系多晶结构物质。The samples of Zn-Al hydrotalcite-like compounds (Zn-Al-HTlc) were synthesized by coprecipitation method.It was found that pure HTlc phase could be got when the molar ratio( x ) of Al to (Zn+Al) was between 0.31 and 0.52;when x ≤0.25,ZnO would emerge;when x >0.52,the amorphous state would appear.The unit cell parameters of Zn-Al-Cl HTlc samples a was between 0.302 and 0.308 nm,and c was between 0.764 and 0.791 nm.When CO^(2-)_3 was used to substitute Cl^- as the gallery anion,the parameter c decreased slightly.With the increasing molar ratio of Zn in HTlc,the particles of Zn-Al-Cl HTlc became more regular hexagonal plate.

关 键 词：类水滑石 层状金属氢氧化物 X射线衍射 

分 类 号：O648.15[理学—物理化学]