不同介质对水热处理三水铝石微观结构的影响  

Effect of Different Solvents on Gibbsite Microstructure During Hydrothermal Treatment

作　　者：王晶[1] 刘岩[1] 时军[1] 李媛媛[1] 

机构地区：[1]大连交通大学材料科学与工程学院,辽宁大连116028

出　　处：《大连交通大学学报》2011年第4期62-65,共4页Journal of Dalian Jiaotong University

基　　金：国家自然科学基金资助项目(50974026);辽宁省教育厅高等学校科研计划资助项目(2008S035);大连市科技计划资助项目(2008A13GX229)

摘　　要：研究了以水、异丙醇、尿素水溶液、碳酸钠水溶液等不同介质水热处理三水铝石获得产物的相组成和微观形貌.研究结果表明:产物微观形貌与产物的相结构有关,以水为介质可以获得呈四方形片状结构的薄水铝石;以异丙醇和碳酸钠水溶液为介质,可以获得三维花形薄水铝石;以尿素水溶液为介质可以获得棒组装的球形碱式碳酸铝胺.水为介质时,三水铝石经12 h转变为薄水铝石;异丙醇和碳酸钠水溶液为介质,三水铝石经6 h转变为薄水铝石;尿素水溶液为介质,三水铝石经历了由三水铝石向薄水铝石和AACH混相到AACH相的转变历程,转变过程需24 h完成.Phase structure and micromorphology of gibbsite after hydrothermal treatment in different solvents were studied.Results show a relationship between micromorphology and phase structure of as-synthesized product.The cubic slice-like boehmite microstructure is obtained in water.The 3D flowerlike boehmite microstructure is obtained in isopropanol or sodium carbonate solution.The global ammonium aluminum carbonate hydroxide（AACH） architectures assembled by the lathes is obtained in urea solvent.Gibbsite can transform to boehmite after 12 h hydrothermal treatment in water.In isopropanol or sodium carbonate solution,this time is decreased to 6 h.In urea solution,aluminum hydroxide is turned from gibbsite to the mixture of boehmite and AACH.Finally,AACH is synthesized over 24 h.

关 键 词：水热合成 三水铝石 薄水铝石 

分 类 号：O611.3[理学—无机化学]