均分散类水滑石纳米粒子的合成

Synthesis of Hydrotalcite-like Compound with Uniform Size

以MgCl2·6H2O和AlCl3·6H2O混合盐溶液为原料,以稀氨水为沉淀剂,采用正交设计法研究了液相共沉淀法制备Mg-Al类水滑石(HTlc)胶体时,反应温度、老化时间、混合盐浓度和沉淀反应方式对产品平均粒径和粒径分布宽度的影响。结果表明,影响平均粒径和粒径分布宽度的因素大小顺序分别为:老化时间>反应方式>反应温度>混合盐浓度和反应方式>反应温度>混合盐浓度>老化时间;优化出的Mg-AlHTlc均分散纳米颗粒的最佳合成方法和条件为:反应方式为pH降低法,反应温度为25℃,老化时间为0.75h,混合盐浓度为0.50mol/L。

Mg-Al hydrotalcite-like compound（HTlc） was synthesized by the co-precipitation method, and the effects of temperature（T）, aging time （t）, total metal ion concentration（c） and mixing method on the size and size distribution of HTlc were investigated by orthogonal design method. It was found that the primary factor affecting the size of Mg-Al HTlc was aging time, while that affecting the size distribution of Mg-Al HTlc was mixing method. The optimal synthesis method and conditions for Mg-Al HTlc with small uniform size were obtained： decreasing pH method, T = 25℃, c = 0.50 mol/L and t = 0. 75 h.