连云港近海沉积物对铜离子的等温吸附研究

Isotherm Adsorption of Cu(Ⅱ) Ions by Marine Sediments from Lianyungang

采用平衡吸附法,进行了连云港近海沉积物对水溶液中铜离子的等温吸附研究,考察了溶液pH、时间、温度对吸附性能的影响。结果表明,在pH=5.0,7 h后反应基本达到平衡。该沉积物对水中铜离子的吸附等温线为台阶形的二级交换等温线,这与该沉积物由伊利石、蒙脱石等矿物组成有关。利用分级离子交换反应模型求出了平衡常数K1和K2。温度升高,K1和K2增大,表明升高温度有利于吸附反应的进行。

Isotherm adsorption of copper ions by marine sediment from Lianyungang was studied by batch test with the effect of pH, contact time and temperature on the adsorption clarified. Re- suits showed that the best pH value for the adsorption was 5. 0 and after 7 h the adsorption reached equilibrium. The isothermal curve belonged to second order exchange isotherm, and the sediment that mainly consists of iolite and montmorillonite accounted for the results. The ex- change equilibrium constants K1 and K2 were calculated by using the isothermal equation of surface stepwise ion exchange, which showed that high temperature favored the adsorption.