用十六烷基三甲基溴化铵(HDTMA)以不同倍数阳离子交换容量对蛭石进行有机改性,制得有机蛭石,用XRD和FT-IR手段对有机蛭石进行表征,考察了吸附时间、pH值和温度等对有机蛭石吸附有机污染物2,4-二-氯酚(2,4-DCP)的吸附效果的影响,并采用Langmuir和Freundlich方程进行拟合,研究其吸附机理.实验结果表明,HDTMA成功进入蛭石层间.相对于蛭石原土吸附量12.72mg/g,改性后的有机蛭石对2,4-DCP的吸附能力均得到显著提高,1.0倍CEC有机蛭石吸附量为90.12mg/g.在酸性条件下,吸附效果更好.Langmuir和Freundlich吸附等温模型均可较好地用来描述1.0倍CEC改性的有机蛭石对2,4-DCP的吸附等温线.有机蛭石对2,4-DCP的吸附量随温度的升高而下降.通过热力学分析发现有机蛭石吸附2,4-DCP是一个自发的吸附过程,低温有利于吸附,材料解吸率不大.
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