改性沸石对Zn2+的吸附特性研究

摘要

This test has studied the influence of natural zeolite and modified zeolites on the adsorption characteristic of Zn2 +under the conditions of T = 25℃ and low concentration of heavy metals. The adsorption isotherm of natural zeolite, modified zeolites to Zn2 + were conformed to the Langmuir equation, the Freundlich equation and the Temkin equation. As for natttral zeolite and modified zoelites, the correlation coefficients of Freundlich equation was the highest. The adsorptive capacity order of four kinds d zeolites to the Zn2 + was NH4+ -form zeolite ＞ K-form zeolite ＞ Mg-form zeolite ＞ zeolite. The order related closely to the valences and hydrated radius of the coordinated cations.%通过间歇震荡平衡法研究了天然沸石及3种改性沸石对Zn2+的吸附特性.研究结果表明,沸石、改性沸石对Zn2+的等温吸附曲线符合Langmuir方程、Freundlich方程、Temkin方程,其中Freundlich方程的拟合性最好,相关系数在0.988～0.999之间.沸石及改性沸石对Zn2+吸附量大小顺序依次为铵改性沸石＞钾改性沸石＞镁改性沸石＞天然沸石.该规律与改性阳离子价数、离子水合半径密切相关.