共缩聚法制备氨基化介孔硅及其对毒死蜱的缓释性能  

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

作　　者：林粤顺 周新华[1] 周红军[1] 龚圣[1] 徐华[1] 陈铧耀[1] 

机构地区：[1]仲恺农业工程学院化学化工学院,广州510225

出　　处：《农药学学报》2016年第5期644-650,共7页Chinese Journal of Pesticide Science

基　　金：国家自然科学基金(21576303);广东省自然科学基金(2016A030313375);广东省科技计划项目(2014A020208126);广州市科技计划项目(201510010150);广东省教育厅特色创新项目(2015KTSCX064)

摘　　要：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。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） andslow-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.

关 键 词：共缩聚法 介孔硅 MCM-41 氨基化改性 毒死蜱 缓释性能 

分 类 号：TQ450.6[化学工程—农药化工]