改性膨润土对水中敌百虫和敌敌畏的吸附性能研究

研究了用季铵盐阳离子表面活性剂四甲基氯化铵（TMAC）、四乙基氯化铵（TEAC）和十六烷基三甲基溴化铵（CTMAB）改性的膨润土对有机磷农药敌百虫和敌敌畏的吸附性能。结果表明，用阳离子表面活性剂改性的膨润土的层间距和有机碳含量与改性时所用表面活性剂种类有关；改性膨润土对水中敌百虫和敌敌畏的吸附能力优于原土，并且吸附量随阳离子表面活性剂碳链的增长而增大；同一长链阳离子表面活性剂改性的膨润土对敌敌畏的吸附能力大于敌百虫；温度升高不利于敌百虫和敌敌畏在改性膨润土上的吸附。

Sorption of Trichlorphon and Dichlorvos in Water by Modified Bentonites

Three kinds of quaternary ammonium compounds,tetramethylammonium(TMA),tetraethylammonium(TEA),and cetyltrimethylammonium(CTMA) are used to treat bentonite and three modified bentonites are prepared. The sorption of trichlorphon and dichlorvos in water by the three modified organo bentonites is studied. The sorption isotherms of trichlorphon and dichlorvos from water onto the natural bentonite and three modified bentonites are determined. It is found that the sorption abilities of these modified bentonites are larger than that of natural bentonite. The interlayer spacing,the organic carbons content, and the sorption abilities of these modified bentonites are directly proportional to alkyl carbon chain length of the quaternary ammonium compound. The influence of sorption temperature is also investigated and found to be negative effect.