中文摘要：

以丙烯腈改性的玉米秸秆为吸附剂，对水体中的Cu^2＋，Pb^2＋，Cd^2＋进行吸附，用双组分竞争模型和LCA模型对实验结果进行拟合．结果表明：改性玉米秸秆对三种重金属离子的吸附能很好地符合Langmuir方程，相关性（R^2）分别为0．98，0．95和0．98，最大吸附容量分别为9．34，31．8和12．7mg·g^-1；在Cu^2＋和Pb^2＋存在下，改性玉米秸秆对Cd^2＋的吸附受到明显的抑制，且随Cu^2＋和Pb^2＋浓度的增大抑制作用加强；在低浓度时，该吸附材料优先吸附顺序为：Cu^2＋〉Pb^2＋〉Cd^2＋高浓度时为：Pb^2＋〉Cu^2＋〉Cd^2＋.

英文摘要：

In this experiment, corn stalk modified by acrylonitrile was used to adsorb Cu^2＋, Pb^2＋ and Cd^2＋ inaqueous solution. Two different models, Langmuir competitive adsorption （LCA） and two-component competitive models were employed to describe the adsorption process. The results showed that adsorption of heavy metals by modified corn stalk was fit the Langmuir＇s equation completely, and R^2 were larger than 0. 95,and the absorption maximum were 9.34, 31.8mg · g^-1 and 12. 73mg · g^-1 respectively for above three metals. The adsorption capacity of Cd^2＋ was markedly restrained with the concentration of Cu^2＋ and Pb^2＋ in solution. According to the equilibrium competitive coefficients, the adsorption sequence of modified corn stalk was Cu^2＋ , Pb^2＋and Cd^2＋.