六方平板状氨基-甲基双官能化SBA-15的合成及对胆红素的吸附

以氨丙基甲基二乙氧基硅烷和正硅酸乙酯为硅源，三嵌段共聚物P123为模板剂，无机盐KCl为助剂，酸性条件下一步法合成了氨基-甲基双官能化SBA-15（AMS）. XRD，FTIR，BET，29Si MAS NMR，SEM及HRTEM等表征结果表明：无机盐不仅提高了AMS材料的介孔有序度，而且控制样品形貌从六方平板状向纤维状转变. 胆红素吸附实验表明：六方平板状AMS比纤维状AMS和纯SBA-15具有更快的吸附速率和更大的吸附容量，这可能是六方平板状形貌易于胆红素扩散以及双官能基团（甲基，氨基）增加了对胆红素吸附作用力的结果.

Synthesis of Amine/methyl Bifunctionalized SBA-15 with Hexagonal Platelet Morphology and Its Application in Bilirubin Adsorption

To effectively remove bilirubin, amine/methyl bifunctionalized SBA-15 materials (AMS) were directly synthesized by co-condensation of 3-aminopropylmethyldiethoxysilane and tetraethoxysilane using an amphiphilic block copolymer as template under acidic-catalyzed and inorganic-salt-assisted conditions. XRD, N2 sorption analysis, TEM, FTIR and 29Si MAS NMR were used to identify the well-ordered mesostructure and the grafting of amine and methyl groups on the surface of the synthesized materials. The addition of inorganic salt KCl was proven to play an important role in the formation of the highly ordered mesostructure. Increasing KCl concentration from 1.0 to 2.0 M, the morphologies of AMS samples shift from hexagonal platelet to fiberlike morphology. The AMS sample with platelet morphology exhibited faster bilirubin adsorption rate and higher bilirubin adsorption capacity than AMS and pure SBA-15 samples with fiberlike morphology. This could be attributed to the fast molecular transport based on the short mesopore channels and the strong interaction between organic groups (amine and methyl) of AMS and bilirubin molecule.