作　　者： ; ; ; ; ; ;

机构地区： 湖南师范大学化学化工学院精细催化合成研究所

出　　处： 《物理化学学报》 2007年第10期1572-1576,共5页

摘　　要： 采用浸渍法将甲草胺吸附到纯硅MCM-41(M41)介孔材料中,以六甲基二硅氮烷(HMDS)为表面改性剂,通过气-固反应对吸附了甲草胺的M41材料(Ach/M41)进行疏水改性,得到了既具有高载药性又能有效延缓甲草胺释放的缓释体系Ach/TMS-M41.XRD、低温N2吸附/脱附、FT-IR和TG等分析结果表明,甲草胺在M41中的吸附量高达0.381g·g-1(质量分数为27.6%),此时M41仍保持原有的孔道结构,且甲草胺能完全分散于M41孔道中.分别对Ach/M41和Ach/TMS-M41在水中的缓释性能进行了测试,甲草胺释放率分别为62.0%和38.1%,表明疏水改性对延缓甲草胺释放有较好的效果.而且,介孔材料孔壁对甲草胺具有明显的紫外屏蔽保护作用. The herbicide of alachlor was incorporated into the channels of MCM-41-type mesoporous silica （M41） by using an impregnation wetness method. Surface hydrophobic modification of the assembly of alachlor-MCM-41 （Ach/M41）, via a gas-solid reaction with 1,1,1,3,3,3-hexamethyldisilazane （HMDS）, gave rise to an efficient sustainedrelease system （Ach/TMS-M41）. The resulting Ach/TMS-M41 not only retained high alachlor loading capacity but also possessed prolonged alachlor release time. The characterization results of XRD, nitrogen adsorption/desorption, FF-IR, and TG analysis showed that the M41 retained its structural integrity during the alachlor-loading process and alachlor was dispersed completely in the channels of MCM-41 with a mass ratio of alachior [m（alachlor）/m（alachlor-MCM- 41）] as high as 0.381 g· g^-1 （mass fraction 27.6%）. The release properties of Ach/M41 and Ach/TMS-M41 in water were investigated. 62% and 38.1% of alachlor were released from Ach/M41 and Ach/TMS-M41 after 6 days, respectively, which indicated that hydrophobic modification of MCM-41 was conducive to sustained-release of alachlor. Furthermore, the framework of the mesoporous silica protected the encapsulated alachlor against ultraviolet light irradiation.

关 键 词： 疏水改性 甲草胺 除草剂 缓释

领　　域： [理学] [理学]