共缩聚法制备氨基化介孔硅及其对毒死蜱的缓释性能

通过化学修饰法对介孔硅（MCM-41）进行改性。以十六烷基三甲基溴化铵（CTAB）为模板剂、正硅酸乙酯（TEOS）为硅源、3-氨丙基三乙氧基硅烷（APTES）为改性剂，采用共缩聚法制备了氨基化介孔硅（NH2-MCM-41），并以毒死蜱为模型药物，制备了毒死蜱/氨基化介孔硅载药体系。利用X射线衍射（XRD）、氮气吸附-脱附、透射扫描电子显微镜（TEM）、扫描电子显微镜（SEM）、Zeta电位和傅里叶红外光谱（FTIR）对MCM-41和NH2-MCM-41的结构、形貌、Zeta电位和毒死蜱的负载情况进行了表征，考察了MCM-41和NH2-MCM-41对毒死蜱的吸附量和缓释性能，并着重探究了NH2-MCM-41与毒死蜱之间的作用力。结果表明:NH2-MCM-41和MCM-41均为有序的六方相介孔结构。MCM-41对毒死蜱的吸附量为106 mg/g，而NH2-MCM-41的最大吸附量为178 mg/g，且后者的吸附量随其Zeta电位值升高而增大。APTES的加入有利于改善MCM-41对毒死蜱的缓释性能；载药体系的释药行为可用Higuchi动力学模型来描述。

Slow-release performance of chlorpyrifos of an amino functionalized mesoporous silica prepared by the co-condensation method

A modified mesoporous silica (MCM-41) is prepared by chemical modification. Amino functionalized mesoporous silica (NH₂-MCM-41) was prepared by co-condensation method, employing hexadecyltrimethylammonium bromide (CTAB) as template, tetraethoxysilane (TEOS) as the silicon source, and 3-aminopropyl triethoxysilane (APTES) as modifying agent. Chlorpyrifos was choosed as the model pesticide, and the chlorpyrifos/amino functionalized mesoporous silica system were prepared using the impregnation method. The structures, morphologies, Zeta potential and loading of chlorpyrifos of MCM-41 and NH₂-MCM-41 were systematically studied using X-ray diffraction assay (XRD), N₂adsorption-desorption, transmission electron microscopy (TEM), scanning electron microscopy (SEM), Zeta potential and fourier transform infrared spectroscopy (FTIR). The adsorption capacity (AC) and slow-release performmance of chlorpyrifos were also discussed. Besides, the interaction between NH₂- MCM-41 and chlorpyrifos is investigated. The results showed that MCM-41 and NH₂-MCM-41 have ordered mesoporous structure of the hexagonal phase. The AC of MCM-41 is 106 mg/g, while the maximum AC of NH₂-MCM-41 is 178 mg/g. And the AC increases with the increase of the Zeta potential of NH₂-MCM-41. The APTES was beneficial to improve the slow-release performance of MCM-41 of chlorpyrifos. The corresponding releasing curves could be described by Higuchi equation.