弱酸介质中类球形谷氨酸/镁铝层状双氢氧化物复合物的制备

Synthesis of Sphere-like Glutamic Acid/Magnesium-Alumina Layered Double Hydroxides in Weak Acidic Medium

在弱酸性介质中,采用阴离子交换法合成了类球形的谷氨酸(Glu)/镁铝层状双氢氧化物(MgAl-LDH)复合物,研究了介质pH值对所得Glu/LDH纳米复合物性质和形貌的影响。结果表明,与碱性介质中阴离子交换法得到的不规则六角形粒子相比,该法制备的纳米粒子呈类球形,且粒径较小,最佳pH值为5.0,探讨了可能的反应机理。

Glutamic acid（Glu for short）/magnesium-aluminum layered double hydroxide compounds（Mg-Al-LDH） were prepared in weak acidic medium,and the influence of pH values on the properties of Glu/LDH compounds was investigated.It was found that Glu/LDH particles prepared in weak acidic medium were sphere-like with smaller size compared with that of traditional ion-exchange method.Our study also indicated that the variation of pH value could change the morphology and dispersion state of Glu/LDH particles.The reaction mechanism is discussed.