共沉淀法制备镁铝水滑石及其表征

Preparation and Characterization of Magnesium- aluminium Hydrotalcite by Coprecipitation Method

采用共沉淀法以硝酸铝、销售镁、氢氧化钠及碳酸钠为原料,制备镁铝水滑石,通过XRD、TG-DTA对不同初始溶液Mg/Al摩尔比制备的水滑石进行表征,结果表明:不同初始溶液Mg/Al摩尔比的情况下均能制备出结晶度好,晶相比较单一,晶型结构较为完整的Mg/Al-CO3水滑石,随Mg/Al摩尔比增加,水滑石热稳定性相应升高,样品结晶度提高。

Magnesium-aluminium hydrotalcite was prepared with A（lNO3）3·9H2O,Mg（NO3）2·6H2O,Na2CO3,NaOH as raw materials by coprecipitation method.The XRD and TG-DTA results show that the pure magnesium-aluminium hydrotalcite can be prepared at the different initial Mg/Al ratios.The thermal stability and crystallinity of the hydrotalcite increase with increasing of initial Mg/Al ratio.