【作者】 邢政； 毕见强； 王伟礼； 管培强； 张政； 孙凌云；

【Author】 XING Zheng BI Jian-qiang WANG Wei-li GUAN Pei-qiang ZHANG Zheng SUN Ling-yun (Key Laboratory for Liquid Structure and Heredity of Materials of Education Ministry,Engineering Ceramics Key Laboratory of Shandong Province, Shandong University, Ji’nan 250061, China)

【机构】 山东大学材料液态结构及其遗传性教育部重点实验室,工程陶瓷山东省重点实验室；

【摘要】 以硫酸铝铵（NH₄Al（SO₄）₂）和碳酸氢铵（NH₄HCO₃）为主要原料,采用均相沉淀法制备纳米前驱体碳酸铝铵（AACH）,通过X射线衍射（XRD）和透射电镜（TEM）研究了pH值对其制备的影响。结果表明,将硫酸铝铵溶液滴入剧烈搅拌的碳酸氢铵溶液中,控制反应体系的pH值在7～8之间,可获得无定形的三水铝石（Al（OH）₃）;控制pH值在8～9之间,获得的产物为勃姆石（AlOOH）;若控制pH值在9～10之间,可获得分散较好且无明显团聚的纳米碳酸铝铵前驱体。更多还原

【Abstract】 Adopting homogeneous precipitation method,ammonium aluminum carbonate hydroxide （AACH） precursor was prepared using ammonium aluminum sulphate （NH₄Al（SO₄）₂） and ammonium hydrogen carbon- ate （NH₄HCO₃） as the starting materials.Effects of pH value on preparing precursors were identified by X-ray diffraction （XRD） and transmission electron microscopy （TEM）.The results indicate that gibbsite （Al（OH）₃） was prepared by adding aqueous solution of NH₄Al（SO₄）₂ drop by drop to aqueous solution of NH₄HCO₃ when pH value of the reaction system is controlled 7-8;the precursor synthesized at pH ranging from 8 to 9,which can be identified as boehmite （AlOOH）;when the pH is 9-10,pure AACH can he formed which is loosely dis- persed and slightly agglomerated.更多还原