摘要：分别以氨水和氢氧化钠为沉淀剂,采用共沉淀法合成Mg-Al层状双金属氢氧化物,对产物的晶相、形貌和结构进行表征,采用正交实验法研究金属离子比例、反应温度、pH值等因素对产物层间距及层板生长机制的影响。结果表明,以氨水作为沉淀剂,Mg与Al物质的量比为2∶1,pH值为9.5,反应温度为40℃时,得到结晶度高,物相纯净且层间距d₍₀₀₃₎达0.882 1 nm的层状双金属氢氧化物。

关键词：层状双金属氢氧化物；制备；表征；层间距

Abstract：The Mg-Al layered double hydroxides were prepared by co-precipitation method using sodium hydroxide(NaOH) and ammonia as precipitant.The structure and morphology of products were cheracterized.The main factors related to interlamellar spacing and growth mechanism of Mg-Al layered double hydrosides were researched by orthogonal tests.The results show that when ammonia is used as precipitating agent,the molar ratio of Mg and Al is 2∶1,pH is 9.5 and the reaction temperature is 40 ℃,Mg-Al layered double hydroxides with high crystallinity,purity phase and an interlamellar spacing(d₀₀₃) of 0.882 1 nm are prepared.

Keywords：layered double hydroxides；preparation；characterization；interlamellar spacing