沸石对几种重金属离子的吸附解吸特性研究

摘要

This test has studied the influence of natural zeolite on the adsorption and desorption characteristic of Cd 2+、 Zn2+、 Cu2+and Pb2+. The result shows that the adsorption isotherm of natural zeolite to Cd2+、 Zn2+、 Cu2+and Pb2+are conformed to the Langmuir equation, the Freundlich equation and the Temkin equation. As for natural zeolite, the correlation coefficients of Freundlich equation is the highest. The adsorptive capacity order of four kinds of heavy metals on zeolte is Pb2+>Cu2+>Zn2+>Cd2+. The desorptive ratio order of four kinds of heavy metals on zeolte is Cd2+>Zn2+>Cu2+>Pb2+.%　　通过室内间歇震荡平衡法研究了天然沸石对重金属离子Cd2+、 Zn2+、 Cu2+、 Pb2+的吸附及解吸特性.研究结果表明：沸石对4种重金属离子Cd2+、 Zn2+、 Cu2+、 Pb2+的等温吸附曲线均符合Langmuir方程、 Freundlich方程和Temkin方程，其中Freundlich方程的拟合性最好，相关系数在0.981~0.994之间.沸石对4种重金属离子的吸附量，其大小顺序依次为Pb2+>Cu2+>Zn2+>Cd2+.沸石对4种重金属离子的解吸率，其大小顺序依次为Cd2+>Zn2+>Cu2+>Pb2+.