以十六烷基三甲基溴化铵(CTAB)有机改性蒙脱土为吸附剂,采用静态摇瓶试验,研究了改性蒙脱土对除草剂敌草隆的吸附行为.探讨了温度、离子强度、腐殖酸、溶液pH值对敌草隆吸附的影响.试验结果表明,CTAB改性蒙脱土对敌草隆具有较大的吸附容量,最大吸附量为20.31 mg/g吸附等温线可用Freundllich方程来描述;吸附反应为自发的吸热过程,升高温度有利于吸附反应的进行;吸附规律符合准二级动力学模型;离子强度对吸附过程有一定的阻碍作用,添加腐殖酸对吸附反应有促进作用,溶液pH值对吸附略有影响.%With the montmorillonite organically modified by cetyltrimethylammonium bromide(CTAB) as the adsorbent, the adsorption performance of the organic modified montmorillonite for pesticide diuron was studied through static shake-flask test. The effects of temperature, ionic strength, humic acid and solution pH value on the adsorption of diuron were discussed. The results of the test showed that, the montmorillonite modified by CTAB had good adsorption performance for diuron with a maximum adsorption capacity of 20.31 mg/g; the adsorption isotherm could be described by Freundlich equation; the adsorption reaction was a spontaneous endothermic process, and the increasing temperature was of benefit to the reaction. The adsorption law fit the pseudo-second-order kinetic model; the adsorption could be inhibited by ionic strength to a certain extend, be promoted by adding humic acid, and be slightly affected by solution pH value.
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