可变电荷土壤吸附铜离子的研究

Research the Adsorption of Cu(Ⅱ) Onto the Variable Charge Soil

在我国南方热带、亚热带地区广泛分布着大面积的酸性可变电荷土壤,这类土壤既可以吸附阳离子又可以吸附阴离子。实验主要研究了吸附时间、p H、离子强度、温度等因素对铜离子的吸附影响。实验结果表明:吸附2 h达到平衡;随着溶液初始p H和温度的增加,铜离子的吸附量增加;随着离子强度的增加,铜离子的吸附量减小。吸附等温线符合Freundlich模型,表明吸附过程是一个多分子层的吸附。

Large areas of variable charge soils are distributed in the tropical and subtropical regions of Southern China, and they can absorb both anions and cations. Effects of adsorbed time, pH, ionic strength and temperature was studied in this experiments. The results showed that the adsorption reaction reached a balance in 2h, and the adsorption of Cu（Ⅱ） increased solution pH and temperature, whereas it decreased with increasing of ionic strength. The adsorption isotherm accord with the Freundlich model, which implied that the adsorption process was a multi-molecular layer adsorption.