粘土矿物对废水中Cu^(2+)、Cd^(2+)、Cr^(3+)的吸附实验研究

Experimental Study on Adsorptive Characteristics of Clay Minerals for the Cu^(2+)、Cd^(2+) and Cr^(3+) in Wastewaters

采用膨润土和高岭土对重金属的吸附性能进行了实验研究。结果表明:pH对吸附效果有明显影响,当pH值增大时,膨润土和高岭土对重金属的吸附量也随之增大。初始浓度相同的情况下,蒙脱石对重金属的吸附大于高岭土,而且都是随初始浓度的增加而增大。蒙脱石和高岭土对三种不同的重金属离子的吸附能力的强弱都是Cr>Cu>Cd,用Langmuir吸附方程式对吸附等温线进行拟合,相关系数达到0.98以上。

Using bentonite and kaolin as adsorbents,an experimental research on adsorptive capacity of some kinds of clay minerals for heavy metal ions in wastewaters was carried out.The test results showed that pH values have obvious effect on adsorptive capacity.When the pH value is increased,the adsorption amount of bentonite and kaolin for the heavy metal ions is also increased obviously.Under the condition of initial concentration is the same,the adsorptive capacity of montmorillonite for heavy metal ions is more than kaolin.The order of adsorptive capacity of montmorillonite and kaolin for these heavy metal ions is Cr^3＋〉Cu^2＋〉Cd^2＋.By means of langmuir equation to fit the adsorption isotherm,the correlation coefficient attained over 0.98.