4A沸石对Sr^(2+)的吸附性能的研究

STUDY ON ADSORPTIVE PROPERTY OF 4A ZEOLITE FOR STRONTIUM

采用间歇法研究在不同环境条件下(浓度、pH值、介质、温度),4A沸石(简称ZF)对Sr2+的吸附性能影响。结果表明:ZF对Sr2+的吸附性能比较好,当Sr2+浓度为0.05 mol/L时,ZF对Sr2+的吸附平衡时间约在14天左右,平衡吸附量为526 mg/g。Sr2+的浓度对ZF的吸附性能影响比较大,其次是溶液的pH值、介质和溶液的温度。ZF对Sr2+的平衡吸附量随Sr2+浓度的升高而增大,但平衡吸附率和平衡吸附比随着浓度的增大而降低。pH值增大时ZF对Sr2+的吸附性能加强。介质溶液含种类、浓度不同的离子时,相对于去离子水介质,ZF对Sr2+吸附性能有程度不同的下降;但腐殖酸的存在可以削弱这种影响。温度升高时,ZF对Sr2+吸附性能降低。

A intermittence method was adopted to study the adsorption of zeolite （ZF） for Sr^2＋ under various conditions including different temperature, pH value, concentration and medium used. The results show that adsorptive capacity of ZF for Sr^2＋ is high with adsorptive equilibrium time of 14 days and equilibrium adsorptive quantity was 526 mg/g when Sr^2＋ concentration is O. 05 mol/L. Adsorptive capacity firstly depends on the Sr^2＋ solution concentration, secondly on the pH value, medium and temperature of the solution. With the rising of solution concentration of Sr^2＋ , the equilibrium adsorptive quantity of Sr^2＋ on ZF increases, the equilibrium adsorption rate and equilibrium adsorption ratio decreases. The adsorptive capacity of Sr^2＋ on ZF increases while the pH values increasing. The adsorptive capacity of ZF for Sr^2＋ decreases in different degree for solutions containing different ions with different concentrations compared with the deionized water, however, the existence of humic acid may weaken such effects. Adsorptive capacity of ZF for Sr^2＋ decreases as the temperature increases.