离子对SBA-15形貌与孔道结构的影响

Effect of Adding Inorganic Salts on the Morphologies and Pore Channels of SBA-15

以三嵌段共聚物聚氧乙烯-聚氧丙烯-聚氧乙烯(P123)为模板剂、正硅酸乙酯(TEOS)为无机硅源,在不同酸度下合成了介孔材料SBA-15,考察了阳离子Na+、K+及阴离子Br-、I-、SO2-4、H2PO4-的加入对介孔材料SBA-15的孔道结构和形貌的影响。通过XRD图谱和N2吸脱附等温线发现,加入无机盐后介孔结构依然存在,且仍具有较高的比表面积;不同阴阳离子及不同加入量都明显影响了材料的形貌。

In this paper, high-quality SBA-15 samples were prepared by using the triblock copolymer P123 as structure-directing agent, tetraethylorthosilicate （TEOS） as silicon source under different acidic conditions. The influences of adding inorganic salts （Na^＋, K^＋, Br^-, I^-, SO4^2-, H2PO4^- ） on the synthesis of mesoporous materials were investigated. The XRD patterns and N2 adsorption-desorption isotherms show that samples still preserved the ordered hexagonal structure and high BET surface area after adding inorganic salts. The species and amounts of inorganic salts influenced obviously the morphologies and pore channels of SBA-15.