Examination of current adsorption models for Pb(II) and Cu(II) adsorption onto Fe3O4@Mg2Al-NO3 Layered Double Hydroxide in aqueous solution

Examination of current adsorption models for Pb(II) and Cu(II) adsorption onto Fe3O4@Mg2Al-NO3 Layered Double Hydroxide in aqueous solution
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水溶液中 Fe3O4@Mg2Al-NO3 层状双氢氧化物吸附 Pb(II) 和 Cu(II) 的现有吸附模型的检验

DOI:
10.1177/0263617417714166
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发表时间:
2018-02
影响因子:
2.9
通讯作者:
Zhang Jing
Zhang Jing
中科院分区:
工程技术3区
文献类型:
--
作者:
Zhao Ling-Xi;Jiang Ming-Chao;Luan Ling-Yu;Li Qing;Zhang Jing

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研究了Fe_3 O_4 @ Mg_2Al-NO_3层状双氢氧化物(LDH)对Pb(Ⅱ)和Cu(Ⅱ)的吸附行为及其与LDH浓度的关系。吸附剂浓度效应(Cs效应),即吸附等温线下降,吸附剂浓度(Cs)的增加,观察到。实验数据拟合的吸附模型包括经典的Freundlich模型,亚稳平衡吸附理论,絮凝模型,幂函数模型,表面组分活性模型。结果表明,Freundlich型亚稳平衡吸附方程、幂函数模型和Freundlich表面组分活度方程均能较好地描述Cs的吸附效应,非线性曲线的相关系数R2均大于0.96。换句话说,由实验数据模拟的它们的内禀参数与Cs值无关。根据Akaike信息准则评价标准,认为Freundlich表面组分活度方程是描述所研究吸附体系Cs效应的最佳模型。
The adsorption of Pb(II) and Cu(II) onto Fe3O4@Mg2Al-NO3 Layered Double Hydroxide (LDH) as a function of Fe3O4@Mg2Al-NO3 LDH concentration was studied. An adsorbent concentration effect (Cs effect), namely adsorption isotherm declines as adsorbent concentration (Cs) increases, was observed. The experimental data were fitted to the adsorption models including the classic Freundlich model, the metastable-equilibrium adsorption theory, the flocculation model, the power function model, and the surface component activity model. The results show that the Freundlich-type metastable-equilibrium adsorption equation, the power function model, and the Freundlich-surface component activity equation can adequately describe the Cs effect observed in the batch adsorption tests as all the correlation coefficients (R2) of the nonlinear plots are higher than 0.96. In other words, their intrinsic parameters simulated from the experimental data are independent of Cs value. It is considered that the Freundlich-surface component activity equation is the best model to describe the Cs effect of the studied adsorption systems by Akaike Information Criterion evaluation criterion.
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