以硅酸钠为前驱物采用间隔自组装法制备有序介孔SBA-15

Synthesis of Ordered Mesoporous SBA-15 by Partitioned Cooperative Self-Assembly Using Sodium Silicate as Precursor

以硅酸钠为前驱物,三嵌段共聚物(P123)为模板剂,分别采用传统过程和间隔自组装(PCSA)过程制备有序介孔二氧化硅(SBA-15).分别考察了两种制备过程中硅酸钠加入量对SBA-15结构的影响.与传统制备过程相比,采用间隔自组装过程,通过简单的调节硅酸钠在不同阶段中的加入量,在不使用添加剂及特殊的制备条件下,可制备孔径可调的SBA-15,其最大孔径可达到10.3 nm(KJS法).所提方法也可规律性地调节SBA-15的孔壁厚度和微孔孔隙度.

The ordered mesoporous SBA-15 was synthesized by the conventional process as well as the partitioned cooperative self-assembly（PCSA） process using the nonionic triblock copolymers （P123） as template and sodium silicate as the silica precursor. The influence of the amounts of sodium silicate on the mesostructures of SBA-15 from the conventional process and the PCSA process, respectively, were investigated. Compared with the conventional process, without using any additives and especial synthetic conditions, the PCSA process can effectively produce larger mesopore size （up to 10.3 nm, KJS） of SBA-15 by adjusting the additive mass of sodium silicate in different stages of the process. The PCSA process can also facilely adjust the pore wall thickness and microporosities of SBA-15 in a controllable way.