重金属离子在泥煤中的饱和吸附容量与离子结构之间的关系

Relationship between saturated adsorption capacity of heavy metal ions on peat and their inonic structure

以泥煤泥炭为吸附剂进行了N i2+,Cu2+,Cd2+,Ce4+,Eu3+,Dy3+,Lu3+的吸附实验,选用极化指数、共价指数与吸附指数来表征重金属离子结构差异。聚类分析可将7种重金属离子分为5类,较好的Langmuir等温吸附方程拟合后计算得到饱和吸附容量由大到小排列顺序为:Cu2+>N i2+>Cd2+>Lu3+>Ce4+>Dy3+>Eu3+,吸附指数与饱和吸附容量具有很好地线性关系,建立了泥煤对重金属的饱和吸附容量与重金属吸附指数之间的模型关系。

The adsorption experiments of Ni^2＋ , Cu^2＋ , Cd^2＋ , Ce^4＋, Eu^3＋ , Dy^3 ＋, Lu^3 ＋ on peat were investigated. The polarizing index, covalent index and adsorption index were used to indicate the different structure of heavy metallic ions. The cluster analysis showed that the seven kinds of heavy metal ions can be divided into five groups. The saturated adsorption capacity of heavy metal ions deduced from better Langmuir isotherm equation decreased in the order： Cu^2＋ , Ni^2＋ , Cd^2＋ , Lu^3＋ , Ce^4＋ , Dy^3＋, Eu^3＋ The adsorption index was correlated to the saturated adsorption capacity of heavy metal on peat excellently and model between the saturated adsorption capacity of heavy metals on peat and adsorption index was established too.