氧化铝自配合溶液中吸附Zn^(2+)及SCN^-的初探

Adsorption Study of Zn^(2+) Cation and SCN^- Anion from Complex Solution on Alumina

研究了在不同pH、浓度、时间、温度、离子强度和螯合剂的条件下,用不同浓度的硝酸预处理的氧化铝吸附剂自锌(Ⅱ)-硫氰酸根配合水溶液中吸附Zn^(2+)及SCN^-的特性,并与自简单锌盐、硫氰酸盐水溶液中的吸附特性相比较,结果表明配合物体系中的吸附作用不同于非配合物体系,除了主要以离子交换机理进行外,还可能在氧化物/水界面上发生配位吸附作用。

The adsorption characteristics of Zn^(2+) cation and SCN^- anion from the complex solution on γ-alumina samples pretreated with nitric acid of different concentrations were investigated. The effects of pH, concentration, time, temperature, ionic strength and chelating agents are investigated. The adsorption of the ion from complex solution is different from that in non-complex solution. The experimental results have been interpreted by predominant ion-exchange mechanism. It is suggested that both the surface hydrolytic action and the complexation may occur at the oxide/water interface.