选择带结构负电荷的蒙脱土和带微量结构负电荷的高岭土,研究了其对pb2+的吸附性能,并探讨了吸附机理.研究表明,蒙脱土和高岭土吸附pb2的动力学曲线符合准二级动力学方程,吸附等温线符合Langmuir方程.Pb2+同时以内层配合和外层配合形式吸附,其相对量与pH值有关.在pH值小于4和大于8的范围内,以内层配合物为主；而pH值在4～8范围内外层配合物比例增大.pb2+能进入蒙脱土的层间,而不能进入高岭土的层间；部分pb2+可进入黏土颗粒的微孔中被固定.蒙脱土对pb2+的吸附能力和饱和吸附量明显高于高岭土.
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