纳米片钠铝石结构KAl(OH)2CO3的水热合成

用水热法制备出了纳米级粒径的纤维状KAl(OH)2CO3，并研究了不同水热反应条件对KAl(OH)2CO3的形成、颗粒度以及形态的影响．研究表明，不同条件下合成的晶粒均呈纤维状，随着温度的升高，长度和粒径均有所增大．在120℃制备得到的纤维平均直径为30nm，且分布均匀；KHCO3和A1(OH)3之比对KAl(OH)2CO3的形貌有显著的影响，KHCO3用量越大，晶粒直径越细；随着介质碱性的增强，晶粒直径在pH为9．5时出现极小值，且粉体的均匀性最好．在特定的反应体系中，当反应时间达到2h后，合成反应基本达到平衡，进一步延长合成时间对粉体的形貌和颗粒尺寸没有明显的影响．

Hydrothermal Synthesis of KA1(OH)2CO3 Powder

KA1(OH)2CO3 powder was prepared by a hydrothermal method using A1(OH)3 and KHCO3 as the starting material. The influence of the composition of the starting material, reaction temperature, acidity of the reaction medium and reaction time on the formation, morphology and particle size of KA1(OH)2CO3 powder was systematically investigated. The research results show that fibrous particles will be obtained at most conditions. The length and diameter of particles increase with the ratio of A1(OH)3 to KHCO3 or the reaction temperature increasing. The morphology and particle size of the products are significantly affected by the acidity of the reaction system, and pH=9.5 is optimal for the preparation of the KA1(OH)2CO3 powder with minimal diameter and the best uniformity.