不同体系中黄河沉积物对La^(3+)的吸附特性

Study on Adsorption of the Yellow River Sediment on La^(3+) in Different System

对比实验研究揭示,不同体系中La3+的吸附等温线类型差别较大,单离子体系中La3+的吸附属于典型的一级吸附模式,多离子体系中,La3+的吸附等温线呈不规则变化,用现有的等温吸附方程均不能较好拟合其等温吸附过程;不同体系中La3+的pH突跃区域无显著性差异;随温度的升高,单离子体系中,表层沉积物对La3+的吸附量增加,多离子体系中则降低;随着泥沙浓度、离子强度的增加和有机质的去除,表层沉积物对La3+的吸附量均降低,而且悬浮物对La3+的吸附量大于表层沉积物。

The study showed that the difference of La^(3+) adsorption isotherm were obvious in different systems, La^(3+) adsorption isotherm was a typical adsorption pattern in single-ion system, and that was anomalistic adsorption pattern in multi-ion system. The pH dependent curves were no significantly different in different systems. The adsorption capacity of La^(3+) was increasing in single-ion system. but that was decreasing in multi-ion system with increasing temperature. The adsorption capacity of La^(3+) were all decreasing with increasing silt concentration and ion intensity and wiping organic matter.The adsorption capacity of La^(3+) in suspended matter was more than that in surface sediment.