Adsorption-desorption Characteristics and Thermodynamics of Quinclorac on Minerals  

二氯喹啉酸在几种矿物中的吸附-解吸特性与热力学研究(英文)

作　　者：Lihua YANG Daoxin GONG Jian ZHOU Yajie YUAN Xuanyu CHEN 杨丽华;龚道新;周健;袁雅洁;陈宣宇(湖南农业大学资源环境学院,湖南长沙410128;湖南农业大学农业环境保护研究所,湖南长沙410128)

机构地区：[1]College of Resource and Environment, Hunan Agricultural University, Changsha 410128, China [2]Institute of Agricultural Environmental Protection, Changsha 410128, China

出　　处：《Agricultural Science & Technology》2017年第1期15-20,26,共7页农业科学与技术（英文版）

基　　金：Supported by Youth Science Foundation of Hunan Agricultural University(15QN30);Agricultural Pesticide Residue Project of Ministry of Agriculture(NYBNYCL20100057);Project of Hunan Department of Science and Technology(2006FJ4266)~~

摘　　要：Adsorption-desorption characteristics of quinclorac on montmorillonite, attapulgite and goethite were investigated by the batch equilibrium techniques. The sorption mechanisms of minerals were discussed based on sorption thermodynamics. The results showed that the adsorption of quinclorac on the 3 minerals was included in both rapid stage and slow equilibrium stage. The adsorption kinetics consisted with the pseudo-second-order equation, the particle diffusion equation, and elovich equations, and among them, fitting from the pseudo-second-order was the best. In addition, it could be seen from the nonzero constant C in the particle diffusion equation that the rate of particle diffusion was not a sole factor. The isotherm adsorption-desorption of quinclorac on the 3 clay minerals all fitted Linear and Freundlich equation very well. The adsorption capacities of minerals for quinclorac followed the order of goethite〉montmorillonite〉attapulgite, The desorption of quinclorac presented obvious hysteresis phenomenon on minerals. The study on thermodynamic behavior indicated that the sorption processes of quinclorec onto minerals were spontaneous, and the sorption spontaneity was strengthened with the temperature increasing.采用批量平衡法,研究了二氯喹啉酸在蒙脱石、凹凸棒石和针铁矿3种矿物中的吸附-解吸特征,并从吸附热力学角度探讨了矿物的吸附机理,结果表明,二氯喹啉酸在供试矿物中的吸附均包含了快速反应阶段和慢速平衡阶段,其吸附动力学曲线均符合准二级动力学方程、颗粒扩散方程和Elovich方程。其中以准二级动力学方程的拟合程度最好,在颗粒扩散方程中的常数项(C值)不为0,表明颗粒内的扩散速率不是决定二氯喹啉酸在供试矿物中吸附快慢的唯一因素。二氯喹啉酸在3种矿物中的吸附/解吸等温线均能用Linear和Freundlich方程很好地拟合,二氯喹啉酸在供试矿物中的吸附容量大小为:针铁矿>蒙脱石>凹凸棒石。二氯喹啉酸在供试矿物中的解吸过程中存在明显的滞后现象,二氯喹啉酸在供试矿物中的吸附具有高度自发性,温度越高吸附过程自发趋势越大。

关 键 词：QUINCLORAC ADSORPTION DESORPTION MINERALS Adsorption thermodynamics 

分 类 号：X592[环境科学与工程—环境工程] S482.4[农业科学—农药学]