Novel layered pesticide slow/controlled release materials——supramolecular structure and slow release property of glyphosate intercalated layered double hydroxides  

作　　者：MENGJinhong ZHANGHui DavidG.Evans DUANXue 

机构地区：[1]MinistryofEducationKeyLaboratoryofScienceandTechnologyofControllableChemicalReactions,BeijingUniversityofChemicalTechnology,Beijing100029,China

出　　处：《Chinese Science Bulletin》2005年第8期745-751,共7页

基　　金：supported by the N ational Natural Science Foundation of China(Grant No.20106002).

摘　　要：Two different interlayer structured glyphosate (GLY) intercalated MgAl layered double hydroxides, as novel pesticide slow/controlled release materials, have been synthesized by co-precipitation method under various reac- tion pH values. The slow/controlled release properties have been tested in Na2CO3 aqueous solution. The release mecha- nism has been interpreted on the basis of the ion-exchange between the guest GLY anions in the lamellar host and 23CO ? in the release media, and the diffusion process of GLY anions in the interstice and interlayer of GLY intercalates, i.e diffusion through the particles, is the rate-limiting step of GLY release process. The GLY intercalate assembled at lower pH, possessing higher interlayer gallery height and vertical monolayered arrangement of guest anions in the interlayer with larger packing density, exhibits better slow release property than that assembled at higher pH. The re- sults reveal that the layered double hydroxides have potential application in the pesticide slow/controlled release area.Two different interlayer structured glyphosate (GLY) intercalated MgAllayered double hydroxides, as novel pesticide slow/controlled release materials, have beensynthesized by co-precipitation method under various reaction pH valees. The slow/controlled releaseproperties have been tested in Na_2CO_3 aqueous solution. The release mechanism has beeninterpreted on the basis of the ion-exchange between the guest GLY anions in the lamellar host andCO_3^(2-) in the release media, and the diffusion process of GLY anions in the interstice andinterlayer of GLY intercalates, i.e. diffusion through the particles, is the rate-limiting step ofGLY release process. The GLY intercalate assembled at lower pH, possessing higher interlayer galleryheight and vertical monolayered arrangement of guest anions in the interlayer with larger packingdensity, exhibits better slow release property than that assembled at higher pH. The results revealthat the layered double hydroxides have potential application in the pesticide slow/controlledrelease area.

关 键 词：草甘膦 杀虫剂 氢氧化物 原料释放控制 

分 类 号：S482.3[农业科学—农药学]