Study of the Equilibrium, Kinetics, and Thermodynamics of Boron Removal from Waters with Commercial Magnesium Oxide

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dc.contributor.authorMontalvo Andia, Javier
dc.contributor.authorYokoyama, Lidia
dc.contributor.authorCesar Teixeira, Luiz Alberto
dc.date.accessioned2019-01-29T22:19:49Z
dc.date.available2019-01-29T22:19:49Z
dc.date.issued2018
dc.description.abstractIn the present work, the equilibrium, thermodynamics, and kinetics of boron removal from aqueous solutions by the adsorption on commercial magnesium oxide powder were studied in a batch reactor. The adsorption efficiency of boron removal increases with temperature from 25°C to 50°C. The experimental results were fitted to the Langmuir, Freundlich, and Dubinin-Radushkevich (DR) adsorption isotherm models. The Freundlich model provided the best fitting, and the maximum monolayer adsorption capacity of MgO was 36.11 mg·g-1. In addition, experimental kinetic data interpretations were attempted for the pseudo-first-order kinetic model and pseudo-second-order kinetic model. The results show that the pseudo-second-order kinetic model provides the best fit. Such result suggests that the adsorption process seems to occur in two stages due to the two straight slopes obtained through the application of the pseudo-first-order kinetic model, which is confirmed by the adjustment of the results to the pseudo-second-order model. The calculated activation energy (Ea) was 45.5 kJ·mol-1, and the values calculated for ?G°, ?H°, and ?S° were -4.16 kJ·mol-1, 21.7 kJ·mol-1, and 87.3 kJ·mol-1, respectively. These values confirm the spontaneous and endothermic nature of the adsorption process and indicated that the disorder increased at the solid-liquid interface. The results indicate that the controlling step of boron adsorption process on MgO is of a physical nature. © 2018 Javier Paul Montalvo Andia et al.es_PE
dc.description.uriTrabajo de investigaciónes_PE
dc.identifier.doihttps://doi.org/10.1155/2018/6568548es_PE
dc.identifier.issn1687806Xes_PE
dc.identifier.urihttps://hdl.handle.net/20.500.12590/15769
dc.language.isoenges_PE
dc.publisherHindawi Limitedes_PE
dc.relation.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85049355843&doi=10.1155%2f2018%2f6568548&partnerID=40&md5=c94364c4eac88d8bccd0b2366d2c6836es_PE
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_PE
dc.sourceRepositorio Institucional - UCSPes_PE
dc.sourceUniversidad Católica San Pabloes_PE
dc.sourceScopuses_PE
dc.subjectActivation energyes_PE
dc.subjectBatch reactorses_PE
dc.subjectBorones_PE
dc.subjectChemicals removal (water treatment)es_PE
dc.subjectDyeses_PE
dc.subjectKinetic parameterses_PE
dc.subjectKinetic theoryes_PE
dc.subjectMagnesiaes_PE
dc.subjectMagnesium powderes_PE
dc.subjectPhase interfaceses_PE
dc.subjectSolutionses_PE
dc.subjectThermodynamicses_PE
dc.subjectActivation energies (Ea)es_PE
dc.subjectAdsorption efficiencyes_PE
dc.subjectAdsorption isotherm modeles_PE
dc.subjectExperimental kineticses_PE
dc.subjectPseudo-first order kinetic modeles_PE
dc.subjectPseudo-second order modeles_PE
dc.subjectPseudo-second-order kinetic modelses_PE
dc.subjectSolid-liquid interfaceses_PE
dc.subject.ocdehttps://purl.org/pe-repo/ocde/ford#1.00.00es_PE
dc.titleStudy of the Equilibrium, Kinetics, and Thermodynamics of Boron Removal from Waters with Commercial Magnesium Oxidees_PE
dc.typeinfo:eu-repo/semantics/article
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