桥连双亚胺介孔材料的制备及其表征

Preparation and characterization of double imine bridged mesoporous silica

以自制双亚胺硅烷偶联剂和正硅酸乙酯为硅源,十六烷基三甲基溴化铵(CTAB)/聚丙烯酸钠(PAANa)为混合模板剂,通过共缩聚法合成桥连双亚胺席夫碱功能化介孔材料。利用红外光谱(FTIR)、氮气吸附-脱附、X射线衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对桥连双亚胺介孔材料进行了表征,着重探讨了不同PAANa用量对介孔材料的结构和形貌的影响,并将其应用于重金属离子的吸附。结果表明,PAANa用量对桥连双亚胺介孔材料的比表面积、孔容积和有序度都有一定的影响;当PAANa的加入量为0.01%时,功能化介孔材料(PMOS_(0.01))展现出较好的形貌、有序度和比表面积。此外,在酸性条件下,PMOS_(0.01)对Cr(Ⅵ)的吸附量为289.24mg/g;而在碱性条件下,PMOS_(0.01)对Cu(Ⅱ)的吸附量为276mg/g。

Using self-made double imine silane coupling agent and ethyl silicate as silicon source, cetyl trimethyl ammonium bromide/sodium polyacrylate （CTAB/PAANa） as hybrid template agent, we synthesized double imine bridged functionalized mesoporous materials through copolycondensation method. And the structure of synthesized silicas were characterized by fourier transform infrared spectroscopy （FTIR）, N2 adsorption-desorption, X-ray diffraction assay （XRD）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM） . Besides, the effects of dosage of sodium polyacrylate （PAANa） on its structure and morphology were emphatically investigated. The silicas were then applied in adsorption of heavy metal ions. The result showed that amount of PAANa had an effect on the specific surface area, pore volume and the degree of order of mesoporous materials. While the dosage of PAANa was 0.01%, mesoporous silicone （PMOS0.01） showed good morphology and degree of order. Moreover, under acidic condition, the adsorption capacity of Cr （VI） was 289.24mg/g, while that of Cu （II） was 276mg/g under alkaline condition.