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以硝酸铝为铝源、尿素为沉淀剂、一水合柠檬酸为结构调控剂,采用水热法合成了具有分级结构的蒲公英状γ-AlOOH颗粒,并经700℃煅烧4h得到具有相同分级结构的γ-Al2O3颗粒.结果表明,样品由500nm实心内核与松散的外层棒状结构组成,粒径约1μm,比表面积为238.77m2/g.对比实验发现,柠檬酸在水热体系中可诱导薄水铝石形成球状颗粒,并在其不足量的情况下诱导产生棒状颗粒.随反应进行,棒状颗粒在球状颗粒表面附着形成了具有分级结构的蒲公英状薄水铝石颗粒.
Using aluminum nitrate as the aluminum source, urea as the precipitating agent and citric acid monohydrate as the structural control agent, dandelion-like γ-AlOOH particles with a hierarchical structure were synthesized by hydrothermal method and calcined at 700 ℃ for 4h to obtain the same hierarchical structure γ-Al2O3 particles.The results showed that the sample consisted of a 500nm solid core and a loose outer rod structure with a particle size of about 1μm and a specific surface area of 238.77m2 / g.Comparison experiments showed that citric acid could induce thin water in the hydrothermal system Aluminum spheres form spherical particles and, in their deficiencies, induce the production of rod-shaped particles. As the reaction progresses, the rod-shaped particles adhere to the surface of the spherical particles to form dandelion-like boehmite particles with a hierarchical structure.