【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。更多还原

【Abstract】 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.更多还原