菲和Cu^(2+)在黑垆土上的吸附及其交互影响

The Interaction Between Phenanthrene and Cu^(2+) Sorption on Dark Loessial Soil

采用批平衡法,研究了菲和Cu2+在黑垆土上的吸附及其交互影响。结果表明,菲和Cu2+在黑垆土上的吸附动力学曲线较好符合一级动力学方程,菲在黑垆土上的吸附主要通过分配作用,其吸附等温曲线符合线性Henry方程,Cu2+的存在抑制菲在黑垆土上的吸附;而Cu2+在黑垆土上的吸附主要通过表面吸附和专性吸附作用,其吸附等温曲线符合Freundlich方程,菲的存在促进了Cu2+的吸附;对菲和Cu2+来说,pH均是影响黑垆土吸附的主要因素,黑垆土对Cu2+的吸附量随着土壤溶液pH值的增加而增加,而对菲的吸附量随着pH增加而降低。

The Interaction between phenanthrene（PHE） and Cu2＋ sorption on dark loessial soil had been investigated using batch equilibrium sorption experimental method.The dynamics of the experimental results showed that the kinetic curves of both PHE and Cu2＋ sorption on the dark loessial soils could be well described as pseudo-first-order kinetic equation.The sorption of polycyclic aromatic hydrocarbon（PAHs） on soil usually follows Henry linear isotherm,which was also observed for the sorption of PHE on the soil used in the study in the absence or in the presence of Cu2＋.This suggests the dominant mechanism of PHE sorption on dark loessial soil was partition.The presence of Cu2＋ in dark loessial soil impedes PHE sorption on dark loessial soil.Whereas Cu2＋ sorption isotherm best fits Freundlich empirical equation with or without PHE in dark loessial soil,which means the dominant mechanisms of Cu2＋ sorption on the dark loessial soil were surface sorption and specific sorption.The presence of PHE impetused Cu2＋ sorption on dark loessial soil.For the effects of pH value on sorption,experimental data obtained indicates that pH was a critical influencing factor for PHE and Cu2＋ sorption on dark loessial soil.The amount of Cu2＋ adsorbed on the dark loessial soil increased with increase in pH value.In contrast,the PHE adsorptive capacity decreased with an increase in pH value of the solution.