Examination of current adsorption models for Pb(II) and Cu(II) adsorption onto FeO@MgAl-NO Layered Double Hydroxide in aqueous solution
The adsorption of Pb(II) and Cu(II) onto Fe 3 O 4 @Mg 2 Al-NO 3 Layered Double Hydroxide (LDH) as a function of Fe 3 O 4 @Mg 2 Al-NO 3 LDH concentration was studied. An adsorbent concentration effect ( C s effect), namely adsorption isotherm declines as adsorbent concentration ( C s ) increases, was...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Hindawi - SAGE Publishing
2018-02-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1177/0263617417714166 |
| Summary: | The adsorption of Pb(II) and Cu(II) onto Fe 3 O 4 @Mg 2 Al-NO 3 Layered Double Hydroxide (LDH) as a function of Fe 3 O 4 @Mg 2 Al-NO 3 LDH concentration was studied. An adsorbent concentration effect ( C s effect), namely adsorption isotherm declines as adsorbent concentration ( C s ) 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 C s effect observed in the batch adsorption tests as all the correlation coefficients ( R 2 ) of the nonlinear plots are higher than 0.96. In other words, their intrinsic parameters simulated from the experimental data are independent of C s value. It is considered that the Freundlich-surface component activity equation is the best model to describe the C s effect of the studied adsorption systems by Akaike Information Criterion evaluation criterion. |
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| ISSN: | 0263-6174 2048-4038 |