铝盐前驱体对水热法制备薄水铝石微观结构的影响  

Effect of aluminum salt precursors on microstructure of boehmite prepared by hydrothermal treatment

作　　者：王晶[1] 徐冰[1] 

机构地区：[1]辽宁省无机超细粉体制备及应用重点实验室大连交通大学,大连116028

出　　处：《中国有色金属学报》2012年第6期1821-1825,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金面上项目(50974026);辽宁省教育厅项目(2008S035)

摘　　要：采用水热法制备了三维形状的薄水铝石粉体,研究前驱体对薄水铝石微观结构的影响。研究结果表明：以硝酸铝为前驱体可获得纳米薄片组装成的花型AlOOH,直径为1μm左右,在其形成过程中无机有机协同作用起到关键作用;以氯化铝为反应物可以获得由纳米棒组装而成的三维海胆型超结构AlOOH,其直径范围为5-8μm,是由于中间产物AlOCl的溶解再结晶引起;以硫酸铝为前驱体可以获得中空球形AlOOH,其直径范围为5-8μm,形成机制是由于中间产物碱式硫酸铝的溶解再结晶引起。水热法获得的薄水铝石可以在600℃时转变为γ-Al2O3,并仍保持原有形貌。Three-dimensional （3D） boehmite architectures were synthesized via a hydrothermal method. The effect of precursors on the morphology of boehmite was investigated. The results show that the flower-like AlOOH with diameter of about 1 grn assembled by nano-plates can be obtained using Al（NO3）3 as the precursor. The organic and inorganic cooperation plays a key role in the formation process. 3D urchin-like A1OOH superstructures consisting of nanorods are fabricated using hydrate AlCl3 as reagents with diameter of 5-8 μm. The dissolution and recrystallinity of semi-finished product A1OC1 caused to form the structures. The hollow boehmite spheres with diameter of 5-8 gm were prepared using Al2（SO4）3 as precursor. The formation mechanism is also due to the dissolution and recrystallization of semi-finished product basic sulfate aluminum. Boehmite prepared by hydrothermal treatments transforms to γ-Al2O3 at 600 ℃. The morphologies of γ-Al2O3 powders still keep their original shapes.

关 键 词：薄水铝石 前驱体 微观结构 水热法 

分 类 号：TQ050.4[化学工程]