采用乙二胺四乙酸二钠(EDTA)对钠基膨润土进行微波改性,以改性膨润土对Pb2＋去除率为参考指标.最佳改性条件为：钠基膨润土3g,EDTA1g,pH值为8,微波功率500w,反应温度35℃,微波反应5min.最佳吸附条件为：pH值＝5.83,改性膨润土用量0.4g,吸附温度30℃,吸附时间40min.结果表明,改性膨润土对Pb2+的去除率达到94%,饱和吸附量为29.67mg/g,改性膨润土对Pb2+的最大吸附量大约是未改性膨润土的2倍.XRD图谱分析证实通过改性使膨润土层间距从1.51nm增大到1.65nm,改性膨润土的红外光谱有较强的C-C键吸收峰,元素分析表明改性膨润土的有机碳、氮、氢含量均较改性前增大.
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