Extension of a Jovanovic–Freundlich isotherm model to multicomponent adsorption on heterogeneous surfaces

Quin̄ones, Igor; Guiochon, Georges

doi:10.1016/s0021-9673(97)01096-0

Cited by 109 publications

(63 citation statements)

References 96 publications

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“…The binding properties of the materials were determined by classical staircase frontal analysis (for a proper understanding of the technique, reading of references [17,18] is suggested). For this purpose, stock solutions of S-NAP or IBU were prepared in 0.05% acetic acid in MeOH at two different concentrations: 0.05 and 0.5 mmol/L.…”

Section: Chromatographic Evaluationmentioning

confidence: 99%

Imidazolium-based functional monomers for the imprinting of the anti-inflammatory drug naproxen: Comparison of acrylic and sol–gel approaches

Kadhirvel

Azenha

Shinde

et al. 2013

Journal of Chromatography A

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a b s t r a c tImidazolium-based monomers were, for the first time, employed in a comprehensive investigation of the molecular imprinting process of naproxen in both acrylic and sol-gel tridimensional networks. To this end, molecularly imprinted polymer (MIP) and xerogel (MIX) were both optimized for performance, by testing different porogen, template speciation and component ratios. The developed imprints were characterized for their pore properties (nitrogen adsorption analysis), site heterogeneity, binding properties and other performance parameters such as the imprinting factor, selectivity (HPLC column tests), column efficiency and mass transfer kinetics (frontal analysis study). MIP exhibited mesoporosity (D p 29 nm), whereas MIX did not, which was reflected in both the lower number of accessible imprinted sites (4.9 mol/g versus 3.7 mol/g) and the slower binding/dissociation in MIX. The naproxen/ibuprofen selectivity ratio was estimated as 6.2 for the MIX and 2.5 for the MIP. Given the high importance of capacity and fast mass transfer in typical applications of imprinted materials, and the satisfactory selectivity of MIP, it can be concluded that the acrylic approach was globally the most advantageous. Still, the remarkably high selectivity of MIX and its reasonable capacity demonstrate that future work devoted to further optimization of both formats is worthwhile.

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Section: Chromatographic Evaluationmentioning

confidence: 99%

Imidazolium-based functional monomers for the imprinting of the anti-inflammatory drug naproxen: Comparison of acrylic and sol–gel approaches

Kadhirvel

Azenha

Shinde

et al. 2013

Journal of Chromatography A

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“…The Langmuir-Freundlich model was analyzed by Sips (1948) who found that the energy distribution function corresponded to a symmetrical quasi-Gaussian function. At low concentrations, the model reduces to the Freundlich model and in the case of an homogeneous surface, it reduces to the Langmuir model (Quinones and Guiochon 1998).…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Adsorption of phenol by oil-palm-shell activated carbons

Lua

Jia

2007

Adsorption

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Steam activated carbons from oil-palm shells were prepared and used in the adsorption of phenol. The activated carbon had a well-developed mesopore structure which accounted for 45% of the total pore volume. The BET surface area of the activated carbon was 1183 m 2 /g and a total pore volume of 0.69 cm 3 /g using N 2 adsorption at 77 K. The adsorption capacity of the activated carbon for phenol was 319 mg/g of adsorbent at 298 K. The adsorption isotherms could be described by both the LangmuirFreundlich and the Langmuir equations. The adsorption kinetics consisted of a rapid initial uptake phase, followed by a slow approach to equilibrium. A new multipore model is proposed that takes into account of a concentration dependent surface diffusion coefficient within the particle. This model is an improvement to the traditional branched pore model. The theoretical concentration versus time curve generated by the proposed model fitted the experimental data for phenol adsorption reasonably well. Phenol adsorption tests were also carried out on a commercial activated carbon known as Calgon OLC Plus 12 × 30 and the agreement between these adsorption data and the proposed model was equally good.

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“…In Arnell et al (2005), an inverse method on plateaus is presented but it requires a large amount of products. Several isotherm models have been considered like, for example, the Langmuir isotherms (Felinger et al, 2003a;Zhang et al, 2001;Antos et al, 1999;Miyabe et al, 2000;James et al, 1999), the Tóth model (Felinger et al, 2003b), the Moreau isotherm (James et al, 1999), the Jovanovic-Freundlich model (Quinones and Guiochon, 1998) or neural networks (Gao and Engell, 2005). The model identification has already been applied in previous studies and has given relatively good results in batch experiments as compared to FA.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, the description of the method used for the error evaluation is only given in Antos et al (1999). The influence of the experimental errors on the estimated parameters has been studied in Zhang et al (2001) and the problem of local minima has been mentioned in James et al (1999), Zhang et al (2001) and Quinones and Guiochon (1998) but, to the authors' knowledge, no systematic identifiability study has been performed yet.…”

Section: Introductionmentioning

confidence: 99%

A systematic approach to SMB processes model identification from batch experiments

Grosfils

Levrie

Kinnaert

et al. 2007

Chemical Engineering Science

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Extension of a Jovanovic–Freundlich isotherm model to multicomponent adsorption on heterogeneous surfaces

Cited by 109 publications

References 96 publications

Imidazolium-based functional monomers for the imprinting of the anti-inflammatory drug naproxen: Comparison of acrylic and sol–gel approaches

Imidazolium-based functional monomers for the imprinting of the anti-inflammatory drug naproxen: Comparison of acrylic and sol–gel approaches

Adsorption of phenol by oil-palm-shell activated carbons

A systematic approach to SMB processes model identification from batch experiments

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