Evaluation of Clavulanic Acid Adsorption in MgAl-layered Double Hydroxides: Kinetic, Equilibrium and Thermodynamic Studies

dc.creatorForte, MBS
dc.creatorElias, ECL
dc.creatorPastore, HO
dc.creatorMaugeri, F
dc.creatorRodrigues, MI
dc.date2012
dc.date2014-07-30T17:27:55Z
dc.date2015-11-26T16:43:25Z
dc.date2014-07-30T17:27:55Z
dc.date2015-11-26T16:43:25Z
dc.date.accessioned2018-03-28T23:28:26Z
dc.date.available2018-03-28T23:28:26Z
dc.identifierAdsorption Science & Technology. Multi-science Publ Co Ltd, v. 30, n. 1, n. 65, n. 80, 2012.
dc.identifier0263-6174
dc.identifierWOS:000305857000005
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/65778
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/65778
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1273584
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionKinetics, equilibrium and thermodynamic studies of clavulanic acid adsorption onto hydrotalcites have been conducted with the aim of selecting the best conditions for biomolecular separation. For this purpose, hydrotalcites of different compositions (containing 30, 63 and 70% MgO in their compositions) were tested, with and without pre-treatment (uncalcined and calcined). A model was obtained to predict the degradation constant. This model may be useful in predicting the extent of clavulanic acid hydrolysis in the adsorption process. Adsorption studies were performed in stirred batch glass reactors. Assays were performed using solutions under different conditions, as well as variable solid/liquid ratios. It was shown that distilled water and a solid/liquid ratio of 15.0 mg/l generated the most favourable conditions for adsorption. A calcined hydrotalcite containing 70% MgO was selected for further study since it presented the best adsorption performance. The adsorbents were characterized by X-ray diffraction methods, Fourier-transform infrared spectroscopy and scanning electron microscopy. Adsorption equilibrium was evaluated from adsorption isotherms determined at different temperatures. The experimental isotherm data were well fitted by a linear equilibrium model with the corresponding adsorption constants being K = 0.404, 0.602, 0.849 and 1.083 l/g at 16.5, 19.0, 21.5 and 24.0 degrees C, respectively, showing an increased adsorption capacity at higher temperatures. Thermodynamic evaluation of the process allowed the Gibbs' free energy (Delta G(0)), the standard enthalpy change (Delta H-0) and the standard entropy change (Delta S-0) to be estimated as follows: Delta G(0) = 2.100, 1.301, 0.503 and -0.295 kJ/mol at 16.5, 19.0, 21.5 and 24.0 degrees C, respectively; Delta H-0 = 94.602 kJ/mol; and Delta S-0 = 0.319 kJ/(mol K), respectively. The positive value of Delta H-0 confirmed the endothermic nature of clavulanic acid adsorption onto HT70c hydrotalcites, which was considered to be mass transport reaction-controlled process.
dc.descriptionO TEXTO COMPLETO DESTE ARTIGO, ESTARÁ DISPONÍVEL À PARTIR DE FEVEREIRO DE 2015.
dc.description30
dc.description1
dc.description65
dc.description80
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionBrazilian Synchrotron Light Laboratory (LNLS)/Brazilian Biosciences National Laboratory (LNBio) [SEM-LV 9660]
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionFAPESP [2008/57298-3]
dc.descriptionBrazilian Synchrotron Light Laboratory (LNLS)/Brazilian Biosciences National Laboratory (LNBio) [SEM-LV 9660]
dc.languageen
dc.publisherMulti-science Publ Co Ltd
dc.publisherBrentwood
dc.publisherInglaterra
dc.relationAdsorption Science & Technology
dc.relationAdsorpt. Sci. Technol.
dc.rightsembargo
dc.sourceWeb of Science
dc.subjectAqueous-solutions
dc.subjectFermentation Broth
dc.subjectHydrotalcite
dc.subjectSorption
dc.subjectRemoval
dc.subjectIntercalation
dc.subjectPurification
dc.subjectTemperature
dc.subjectZeolite
dc.subjectDye
dc.titleEvaluation of Clavulanic Acid Adsorption in MgAl-layered Double Hydroxides: Kinetic, Equilibrium and Thermodynamic Studies
dc.typeArtículos de revistas


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