Abstract
The BiLangmuir and Redlich-Peterson models as well as their extended equations were tested for the modeling of one- and two-component adsorption equilibrium of Co(II) and Ni(II) ions on EDTA- and DTPA-modified silica gel. An approach consisting in initialization of parameter values and non-linear parameter estimation by minimization of two objective functions (MPSD and ERRSQ) was proposed to assure that equilibrium parameters obtained related to the global minimum. A usage of the experimentally obtained value of maximum adsorption capacity as an initial guess made an iteration procedure well-posed and independent of the Ki guess values. None of the parameters obtained for one-component systems satisfactorily helped in prediction of the two-component adsorption equilibrium. The application of the extended BiLangmuir model identified the coexistence of low- and high-energy active sites on EDTA/DTPA-silica gel that showed an unequal ability for Co(II) and Ni(II) adsorption.
| Original language | English |
|---|---|
| Pages (from-to) | 376-385 |
| Number of pages | 10 |
| Journal | Chemical Engineering Journal |
| Volume | 172 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1 Aug 2011 |
| Externally published | Yes |
Keywords
- Adsorption isotherm
- Chelating agent
- Modeling
- One-component
- Two-component
ASJC Scopus subject areas
- General Chemistry
- Environmental Chemistry
- General Chemical Engineering
- Industrial and Manufacturing Engineering
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