摘要
以正硅酸乙脂（TEOS）为硅源，十六烷基三甲基溴化铵（CTAB）为表面活性剂，添加聚乙二醇（PEG）和聚乙烯吡咯烷酮（PVP）为分散剂，合成了A1MCM-41纳米硅铝介孔分子筛，运用XRD、N2吸脱附、TEM对所得样品进行表征，结果表明，添7DPEG和PVP均能显著改善A1M—CM-41纳米硅铝介孔分子筛的分散性，但是PVP的分散效果明显好于PEG，这是因为，PVP链上吡咯基中电负性的氧原子与分子筛颗粒表面的羟基形成氢键，更易吸附在颗粒的表面，提高颗粒的分散性。
High dispersed mesoporous aluminosilicate AIMCM-41 nanoparticles have been synthesized by using tetraethyl orthosilicate （TEOS） as silica source, eetyltriethylammonium bromide（CTAB） as a templating agent and PEG, PVP as dispersant agents. The obtained materials were characterized by XRD, N2 adsorption-desorption and TEM. The results showed that put PEG and PVP into the synthetic system could significantly improve the dispersibility of the materials, but the dispersion effect of PVP was better than that of PEG. This could be attributed to hydrogen bonds were formed between the eleetronegativity oxygen atom of PVP and the hydroxyl group of the molecular sieves. Thereby the PVP moleculars was easily adsored on the surface of molecular sieves and improved the dispersibility.
