精喹禾灵在高岭土和蒙脱石中的吸附行为  

Adsorption of quizalop-p-ethyl on montmorillonite and kaolinite

作　　者：丁春霞[1,2] 龚道新[2,3] 肖浩[2,3] 任颖俊[2,3] 杨丽华[2,3] 

机构地区：[1]湖南农业大学理学院,长沙410128 [2]湖南农业大学资源环境学院,长沙410128 [3]湖南农业大学农业环境保护研究所,长沙410128

出　　处：《环境化学》2013年第6期1067-1072,共6页Environmental Chemistry

基　　金：农业部农药残留试验基金项目(2010H216)资助

摘　　要：采用批量平衡实验,研究了精喹禾灵在蒙脱石和高岭土中的吸附行为及作用机理.结果表明,精喹禾灵在这两种供试黏土矿物中的吸附过程分为快速吸附、慢速吸附和吸附平衡3个阶段,吸附平衡时间都约为12 h;Langmuir模型能较好地描述其在两种供试黏土矿物中的吸附行为;蒙脱石和高岭土对精喹禾灵的最大吸附容量的关系为蒙脱石>高岭土;傅立叶变换红外光谱以及X-射线衍射分析显示,在吸附过程中精喹禾灵分子进入了蒙脱石层间,而未进入到高岭土层间;蒙脱石主要是通过其层间结构对精喹禾灵进行吸附,而高岭土则主要是通过硅氧外表面发生吸附,其吸附作用力主要是氢键.Batch equilibrium experiments were performed to study the adsorption characteristics and adsorption mechanisms of quizalofop-p-ethyl on montmorillonite and kaolinite.The results showed that the adsorption of quizalofop-p-ethyl on the two clay minerals could be divided into three phases：fast adsorption phase,slow adsorption phase,and equilibrium phase 12 h.The adsorption isotherms of quizalofop-p-ethyl on the two clay minerals were well fitted by the Langmuir equation.The adsorption capacity of quizalofop-p-ethyl on montmorillonite was larger than on kaolinite.FT-IR spectroscopy and XRD analysis indicated that quizalop-p-ethyl could enter the interlayer of montmorillonite,but not kaolinite.Hydrogen bonds might exist between quizalofop-p-ethyl and kadinite minerals.

关 键 词：蒙脱石 高岭石 黏土矿物 精喹禾灵 吸附 

分 类 号：S481.8[农业科学—农药学]