三维有序大孔Al2O3制备的新方法及表征

以聚苯乙烯胶晶为模板,用Al(NO3)3•9H2O为前驱物,使用柠檬酸为配体,成功地制备了孔径为250～350 nm的三维有序大孔Al2O3材料.SEM观察表明,所得大孔材料孔结构规则排列,孔与孔之间通过小孔相连,形成了一个三维有序排列的蜂窝状结构.实验发现,以Al(NO3)3•9H2O为前驱物,加入柠檬酸可以防止团聚粒子的产生,有利于三维有序结构的形成.前驱物浓度在0.5～0.8 mol•L－1范围内均能得到较好的三维有序大孔结构.在1 100 ℃焙烧2 h后,Al2O3大孔材料仍能保持完整的规则孔结构特征,表现出较高的热稳定性.

A New Route to Fabricate Highly Ordered Three-dimensional Macroporous Al2O3

Using low-cost Al(NO3)3•9H2O as raw material and citric acid as chelator, highly ordered three-dimensional macroporous (3DOM) Al2O3 with pore size of 250～350 nm has been successfully fabricated by a template method in which polystyrene colloidal crystal with diameter of about 600 nm were used as template. The TGA, TG-IR and SEM observations show that adding citric acid is in favor of forming the three-dimensional ordered structure since it can avoid forming agglomerated particles during heat treatment. Within the range of 0.5～0.8 mol•L－1 of the precursor concentration, the Al2O3 samples obtained are highly ordered three-dimensional macroporous materials, and such macroporou structure is maintained up to 1 100 ℃,showing a high thermostability.