铝盐前驱体对水热法制备薄水铝石微观结构的影响

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-Al2O3,并仍保持原有形貌。

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

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 μm 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 AlOOH 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 AlOCl caused to form the structures.The hollow boehmite spheres with diameter of 5?8 μm 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 ?-Al2O3 at 600 ℃.The morphologies of ?-Al2O3 powders still keep their original shapes.