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选取胶州湾海域2个站点的沉积物进行了表面酸碱电位滴定实验,并考察了人工海水介质中对铜离子的吸附性能,比较了介质的盐度和温度等对吸附动力学曲线和吸附等温线的影响。结果发现:2个站点的沉积物随pH值由3增大到10表面质子电荷密度的值由正转负,零净质子电荷点pHPZNPC均在4.0～4.5之间,表面位浓度HS在1.34×10-4～1.90×10-4mol.L-1之间;沉积物对铜离子的动力学吸附曲线可用伪一级动力学方程、伪二级动力学方程、Elovich方程、双常数速率方程拟合,其中伪二级动力学方程符合较好,吸附在2 h左右达到平衡;吸附等温线可用Langmuir等温式拟合。零净质子电荷点低、表面位浓度大的沉积物对铜离子的吸附能力较强。蒸馏水介质中,沉积物对铜离子的饱和吸附量小于在稀释人工海水中和人工海水中的结果;较高的温度使饱和吸附量增大。
The sediment from two sites in Jiaozhou Bay was selected to conduct surface acid-base potentiometric titration experiments. The adsorption properties of Cu2 + in artificial seawater were also investigated. The effects of medium salinity and temperature on the adsorption kinetics and adsorption isotherms Effect of lines. The results show that the values of proton charge density increase from positive to negative with the increase of pH value from 3 to 10, the pHPZNPC of zero net proton charge point is between 4.0 and 4.5, and the surface site concentration HS is 1.34 × 10-4 ~ 1.90 × 10-4mol.L-1. The kinetic adsorption curves of copper ions in sediments can be fitted by pseudo-first-order kinetic equation, pseudo-second-order kinetic equation, Elovich equation and two-constant rate equation , Of which the pseudo-second order kinetic equation is in good agreement, and the adsorption reaches equilibrium in about 2 h. The adsorption isotherm can be fitted by Langmuir isothermal equation. Zero net proton charge point is low, the surface concentration of sediments on the copper ion adsorption capacity. In distilled water medium, the saturated adsorption capacity of copper ion in sediments was smaller than that in artificial seawater and artificial seawater. Higher temperature increased the saturated adsorption capacity.