水动力条件对太湖底泥吸附苯胺性能的影响

应用平衡研究法研究不同水动力条件下苯胺在太湖底泥中的吸附特性及其吸附动力学特征。结果表明,太湖底泥对苯胺具有较强的吸附能力,苯胺在太湖底泥上的最大吸附量为1.131 mg/g,其吸附行为可以用Freundlich型吸附等温式描述。采用Lagrange伪一级动力学和伪二级动力学模型对不同水动力条件下的苯胺吸附动力学数据进行了拟合,结果表明,沉积物对苯胺的吸附动力学更符合Lagrange伪二级动力学模型,且吸附速率随着初始浓度的增大而显著增大。此外,自吸附开始至1 h左右,吸附速率与水动力条件呈明显的正相关性。说明水动力条件的增大,增加了苯胺与沉积物的接触面积,使其扩散系数相对增大,更有利于沉积物对苯胺的表面吸附。自1 h过后,随着时间的延长,吸附速率基本不受水动力条件的影响。

Aniline Adsorption Properties on Taihu Lake Sediment under Different Hydrodynamic Conditions

Batch equilibrium experiments were done to assess adsorption and sorption kinetics characteristics of aniline by Taihu Lake sediment at different hydrodynamic conditions.Results showed that the Lake sediment had strong adsorption capability for aniline,with the maximum adsorption quantity of aniline on the sediment as 1.131 mg/g and the Freundlich adsorption isotherm can fit to describe the adsorption behavior of aniline.The kinetic data obtained at different hydrodynamic conditions were analyzed using Lagrange pseudo first-order kinetic model and pseudo second-order kinetic model,and results indicated that the adsorption kinetics of aniline fitted very well with the pseudo second-order kinetic model,and the adsorption rate was significantly increased with the increase of the initial concentration.In addition,the adsorption rate and hydrodynamic conditions showed a significant positive correlation since the adsorption began about one hour,which suggested that larger hydrodynamic conditions increased the contact area between aniline and sediment,and made it more conducive for the sediment adsorption of aniline on the surface.As the time increased,the adsorption rate was little affected by the hydrodynamic conditions after one hour.