采用一种自制的具有上下两个反应室的两级反应器,将盐溶液MgCl_2·6H_2O、AlCl_3·6H_2O和沉降剂Na_2CO_3、NaOH进行反应来合成了镁铝型层状双氢氧化物(简称Mg-Al-CO_3 LDHs)纳米粉.研究了反应物浓度、搅拌速度、表面活性剂种类对晶体结构、颗粒尺寸、和粒度分布的影响.TEM、XRD、激光粒度分布测试仪的检测结果表明:最佳反应条件下所得产物的形貌为片状,最小平均粒径为30～50 nm,尺寸分布比较均匀且结晶度较高.反应物浓度增加,颗粒尺寸变小且均匀性提高;搅拌速度增加,颗粒尺寸降低且粒度分布变窄.研究表明不同种类表面活性剂对晶体结构影响很大.
The nanopowders of magnesium aluminium layered double hydroxides (Mg-Al-CO_3 LDHs) were prepared from the reaction of the salt solution of MgCl_2·6H_2O, AlCl_3·6H_2O and precipitating agent of Na_2CO_3, NaOH in a two-stage reactor with up and down reaction chamber. The effects of reactant concentration, stirring speed, surfactant type on the crystal structure, particle size, and size distributionthe have been studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), laser particle size distribution analyzer. The results demonstrated that the product synthesized in the optimum conditions has excellent uniform and plate structure with a particle size of approximately 30-50 nm, and has higher degrees of crystallinity. As the reactant concentration increasing, particle size became smaller and more uniform; stirring speed increasing, particle size decreased and particle size distribution curve became narrower. The reasult also indicated that different types of surfactants have a significant influence on the crystal structure.
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