Adsorption selectivity of heavy metals by Na-clinoptilolite in aqueous solutions

Adsorption selectivity of heavy metals by Na-clinoptilolite in aqueous solutions
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斜发沸石钠对水溶液中重金属的吸附选择性

DOI:
10.1007/s10450-019-00081-x
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发表时间:
2019-05
期刊:
Adsorption
影响因子:
--
通讯作者:
Li Hang
Li Hang
中科院分区:
其他
文献类型:
--
作者:
Liu Xinmin;Tian Rui;Ding Wuquan;He Yunhua;Li Hang

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优先吸附对废水中重金属的分级去除具有重要意义。研究了重金属离子M2+(Pb 2+、Zn 2+、Cd 2+和Cu 2+)在Na+-斜发沸石上的吸附力。重金属离子的选择性顺序为Pb ~(2+)> Zn ~(2+)> Cd ~(2+)> Cu ~(2+)。天然沸石对M ~(2+)和Na ~+的选择性系数随离子强度的增加而减小,这取决于水合体积(空间位阻)和阳离子电子构型(配位和极化)的影响。导致多孔沸石上Hofmeister系列的主要因素的贡献为:离子空间效应>配位作用>非经典极化作用。Na+与沸石之间的相互作用相对较弱,Na+体系中沸石表面附近的电场较强,Na-沸石在强电场作用下重金属的电子构型明显增强。一般而言,弱极化离子可对沸石进行预处理,由于在这些离子溶液中沸石/水界面处存在较强的电场,有利于提高配位作用和极化作用的贡献,从而提高沸石对废水或土壤中重金属阳离子的去除效率。
Preferential adsorption is important to classification removal of heavy metals in wastewaters. In the present study, the adsorption forces of heavy metal cationsM2+(Pb2+, Zn2+, Cd2+and Cu2+) onto the Na+-clinoptilolite were analyzed. The selectivity sequence of heavy metal cations was given as Pb2+> Zn2+> Cd2+> Cu2+. The selectivity coefficientbetweenM2+and Na+on the natural zeolite decreased with increasing ion strength, which depends on the effects of hydration volume (steric) and electron configuration of cations (coordination and polarization). The contributions of main factors resulting in the Hofmeister series on porous zeolite were: the ionic steric effects > coordination > non-classical polarization. The interactions between Na+and zeolite is relatively weak, the electric field near zeolite surface is strong in Na+system, and the electron configurations of heavy metals are significantly enhanced by the strong electric field using Na-zeolite. Generally, the zeolite can be pretreated by ions with weak polarization, which is helpful to increase the contributions of coordination and polarization because of the strong electric field at the zeolite/water interface in these ionic solutions, and then improve the removal efficiency of heavy metal cations in wastewaters or soils using zeolite.
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