论文部分内容阅读
本文叙述了盐度为5％。的河口水中Cd（Ⅱ）在Fe2O3·nH2O（am）上的吸附等温线以及pH，盐度对吸附百分率的影响，着重讨论了吸附对固-液界面电性的影响和不同盐度（s＝2.5‰;5.0‰;7.5‰）时吸附Cd（Ⅱ）后变化的等电点。结果表明：Cd（Ⅱ）在Fe2O3·nH2O（am.）上的吸附为特性吸附，固液界面的电性变化及等电点移动与体系的pH和Cd（Ⅱ）的吸附量有关。盐度上升，吸附量降低，由吸附～pH曲线和海水中锅的溶存状态可知吸附机理为离子交换～表面络合沉淀过程。
This article describes the salinity of 5%. The adsorption isotherms of Cd (Ⅱ) on Fe2O3 · nH2O (am) and the influence of pH and salinity on the adsorption percentage of Cd (Ⅱ) in the estuarine water were discussed. The effects of adsorption on the electrical properties at solid- 2.5 ‰; 5.0 ‰; 7.5 ‰) adsorption of Cd (Ⅱ) after the change of the isoelectric point. The results showed that the adsorption of Cd (Ⅱ) on Fe2O3 · nH2O (am.) Was characteristic adsorption. The electrical property and the isoelectric point shift of Cd (Ⅱ) were related to the pH and Cd (Ⅱ) adsorption capacity of the system. The salinity increases and the amount of adsorption decreases. From the adsorption-pH curve and the dissolution state of the pot in the seawater, the adsorption mechanism is the ion exchange-surface complexation and precipitation process.