中文摘要：

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0．8821nm的层状双金属氢氧化物。

英文摘要：

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.