Modeling the Effect of pH on Kinetics of Heavy Metal Ion Biosorption. A Theoretical Approach Based on the Statistical Rate Theory

Płaziński, Wojciech; Rudziński, W.

doi:10.1021/la803075k

Cited by 24 publications

(23 citation statements)

References 37 publications

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“…Therefore, both these equations are equally suitable to correlate the experimental (q, C) data as the models presented in the previous section; they are not able to account for the pH-related effects, however. A similar observation has already been made concerning Model A (Crist et al 1994;Plazinski and Rudzinski 2009a). Thus, the fact of good correlation of the data by these mathematical expressions should not lead to drawing any reliable conclusions about mechanisms governing the biosorption processes.…”

Section: Some Observationssupporting

confidence: 63%

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How does mechanism of biosorption determine the differences between the initial and equilibrium adsorption states?

Rudziński

Płaziński

2010

Adsorption

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The analysis of various models assumed to represent the influence of pH on heavy metals biosorption equilibrium is presented. It shows that all of them lead to the same mathematical expressions (e.g. the Langmuir or the Flory adsorption isotherm equations) when the pH effects are neglected. Even if considering the pH effects, some of them (competitive adsorption and ion-exchange models, for instance) still lead to analogical expressions for sorption isotherm equations. The accepted mechanism of biosorption may, however, influence strongly the differences between the initial and equilibrium states of biosorption system. Keywords

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Section: Some Observationssupporting

confidence: 63%

“…More details related to this model can be found in one of our previous papers (Plazinski and Rudzinski 2009a).…”

Section: Non-competitive Adsorption Model (Model B)mentioning

confidence: 99%

How does mechanism of biosorption determine the differences between the initial and equilibrium adsorption states?

Rudziński

Płaziński

2010

Adsorption

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“…The preference of the sorbent for the Pb 2+ ions may be due to the fact that the metal ions have the largest atomic weight and paramagnetic, the most electronegative ion and has the highest standard reduction potential compared to Zn 2+ and Cd 2+ ions. These ionic properties make Pb 2+ most likely to be adsorbed [8,11]. …”

Section: The Competitive Effects Of Ions From Binary System Sorptionmentioning

confidence: 99%

“…Among these studies, MEUF could remove many metal ions, including Cd 2+ , Ni 2+ , Zn 2+ [10][11][12], Cr 3+ , Mn 2+ , Pb 2+ , CrO 4 3− , Cu 2+ , …”

Section: Introductionmentioning

confidence: 99%

Non-Competitive and Competitive Adsorption of Pb2+, Cd2+ and Zn2+ Ions onto SDS in Process of Micellar-Enhanced Ultrafiltration

Feng

et al. 2018

Sustainability

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Abstract:Competitive adsorption of Pb 2+ , Cd 2+ and Zn 2+ ions on sodium dodecyl sulfate (SDS) in binary mixtures were investigated compared with non-competitive adsorption in the unitary metal solution in micellar-enhanced ultrafiltration at a temperature of 25 • C. Mutual interference effects were investigated based on the removal rate, the Langmuir Competitive Model (LCM) and equilibrium adsorption capacity ratios, q e /q m , which indicated the presence of other metal ions. The results indicated that the removal rate and adsorption capacity of Pb 2+ were higher than that of the other metal ions in unitary and binary systems. The effects on SDS micelles for Cd-Pb and Zn-Pb combinations were found to be antagonistic. However, it was a favorable effect for the Cd-Zn combination, and the metal ions sorption followed the order: Pb 2+ > Cd 2+ > Zn 2+ . The behavior of non-competitive and competitive adsorption for Cd 2+ and Zn 2+ in a single system and in the presence of Pb 2+ were well described by LCM. Moreover, the LCM showed poor fitting to non-competitive and competitive adsorption of Pb 2+ in a single solution and in the presence of Cd 2+ or Zn 2+ . In conclusion, the removal of Pb 2+ in the presence of Zn 2+ or Cd 2+ showed greater efficacy than that of Cd 2+ or Zn 2+ in the presence of Pb 2+ .

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“…To represent the adsorption from dilute solutions of molecules on an energetically heterogeneous adsorbent surface the fundamental equation for the overall adsorption isotherm t  is (Heuchel and Jaroniec 1995;Jaroniec and Madey 1988;Płaziński and Rudziński 2009a;Podkościelny 2008):…”

Section: Adsorption Equilibriummentioning

confidence: 99%

Heterogeneity of multiwalled carbon nanotubes based on adsorption of simple aromatic compounds from aqueous solutions

et al. 2014

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The surface heterogeneity of multiwalled carbon nanotubes (MWCNTs) is studied on the basis of adsorption isotherms from dilute aqueous phenol and dopamine solutions at various pH values. The generalized Langmuir-Freundlich (GLF) isotherm equation was applied to investigate the cooperative effect of the surface heterogeneity and the lateral interactions between the adsorbates. The theoretical isosteric heats of adsorption were obtained assuming that the heat of adsorption profile reveals both the energetic heterogeneity of the adsorption system and the strength of the interactions between the neighboring molecules. The adsorption energy distribution (AED) functions were calculated by using algorithm based on a regularization method. The great advantage of this method is that the regularization makes no assumption about the shape of the obtained energy distribution functions. Analysis of the isosteric heats of adsorption for MWCNTs showed that the influence of the surface heterogeneity is much stronger than the role of the lateral interactions. The most typical adsorption heat is 20-22 kJ/mol for both phenol and dopamine. After purification of nanotubes, heat value for phenol dropped to 16-17 kJ/mol. The range of the energy distribution is only slightly influenced by the surface chemistry of the nanotubes in the aqueous conditions.

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Modeling the Effect of pH on Kinetics of Heavy Metal Ion Biosorption. A Theoretical Approach Based on the Statistical Rate Theory

Cited by 24 publications

References 37 publications

How does mechanism of biosorption determine the differences between the initial and equilibrium adsorption states?

How does mechanism of biosorption determine the differences between the initial and equilibrium adsorption states?

Non-Competitive and Competitive Adsorption of Pb2+, Cd2+ and Zn2+ Ions onto SDS in Process of Micellar-Enhanced Ultrafiltration

Heterogeneity of multiwalled carbon nanotubes based on adsorption of simple aromatic compounds from aqueous solutions

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