改性膨润土粉末对克百威的吸附

Adsorption of Modified Bentonite Powder to Carbofuran in Water

分别用季铵盐阳离子表面活性剂十六烷基三甲基溴化铵(CTMAB)和阴离子表面活性剂十二烷基苯磺酸钠(SDBS)改性钠基膨润土,研究改性膨润土吸附水中氨基甲酸脂类农药克百威的效果、机理及主要影响因素。结果表明,改性膨润土的有机碳含量和用土量影响其对克百威的吸附去除率。表面活性剂通过插层进入膨润土间,有效扩张了膨润土的层间距,有机插层效果明显。100CTMAB-10SDBS膨润土为最佳的吸附剂类型,最佳用土量20.00 g/L,吸附平衡时间为3 h,平衡去除率为92.60%。改性膨润土对克百威的吸附符合Freundlich模型,变形公式的相关系数在98%以上。

Modified organobentonite were synthesized by placing quaternary ammonium salt cationic surfactants cetyltrimethylammonium bromide（CTMAB）and anionic surfactants sodium dodecyl benzene sulfonate（SDBS）on Na-bentonite.The adsorption effect,mechanism and influence factors for modified bentonite to adsorb pesticide carborfuran of carbamate in water were investigated.Results indicated that organic carbon content and dosage of modified bentonite affected removal rate of adsorption of modified bentonite to carbofuran.Surfactants entered into bentonite by intercalation,and expanded the layers of bentonite in effect,organic intercalation had an obvious result.100CTMAB-10SDBS bentonite was the best modifier,with the best dosage of soil 20.00 g/L,adsorption equilibrium time 3 h and removal efficiency 92.60%.Adsorption behavior of modified bentonite was in accordance with Freundlich model,with correlation coefficient of deformation formula above 98%.