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dc.contributor.authorAlkan, Mahir
dc.contributor.authorDoğan, Mehmet
dc.contributor.authorTurhan, Yasemin
dc.contributor.authorDemirbaş, Özkan
dc.contributor.authorTuran, Pınar
dc.date.accessioned2019-10-17T11:11:08Z
dc.date.available2019-10-17T11:11:08Z
dc.date.issued2008en_US
dc.identifier.issn1385-8947
dc.identifier.urihttps://doi.org/10.1016/j.cej.2007.07.080
dc.identifier.urihttps://hdl.handle.net/20.500.12462/8497
dc.description.abstractThe use of sepiolite for the removal of maxilon blue 5G from aqueous solutions at different contact times, stirring speeds, initial dye concentrations, pHs, ionic strengths and temperatures was investigated. The adsorption process attained equilibrium within 60 min, which was an economically favorable requisite, in addition to the local abundance of the raw material. The extent of dye removal increased with increasing initial dye concentration, contact time, pH and temperature, and decreased with increasing ionic strength. On the other hand, stirring speed had no important effect on adsorption process. The adsorption process was found to be endothermic and physical in nature. Four kinetic models, the pseudo-first- and second-order equations, Elovich equation and the intraparticle diffusion models were selected to follow the adsorption process. Kinetic parameters, rate constants, equilibrium adsorption capacities and related correlation coefficients for each kinetic model were calculated and discussed. It was shown that the adsorption of maxilon blue 5G onto sepiolite could be described by the pseudo-second-order equation. The diffusion coefficients were calculated and found to be in the range of 3.625 x 10(-8) to 12.100 x 10(-9) cm(2)/s. Various thermodynamic activation parameters such as enthalpy of sorption Delta H*, Gibbs energy change Delta G* and entropy Delta S* were estimated. The positive value of Delta H* and Delta G* shows the sorption process is endothermic and not spontaneous. The negative value of entropy Delta S* shows the decreased randomness at the solid-liquid interface during the sorption of dye ions onto sepiolite particles. In addition, an activation energy of sorption has also been determined based on the pseudo-second-order rate constants. The activation energy of system (E-a) was calculated as 19.25 kJ/mol. Sepiolite, an inexpensive and easily available material, could be an alternative for more costly adsorbents used for dye removal in wastewater treatment processes.en_US
dc.language.isoengen_US
dc.publisherElsevier Science Saen_US
dc.relation.isversionof10.1016/j.cej.2007.07.080en_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectSepioliteen_US
dc.subjectDyeen_US
dc.subjectAdsorption Kineticsen_US
dc.subjectMechanismen_US
dc.titleAdsorption kinetics and mechanism of maxilon blue 5G dye on sepiolite from aqueous solutionsen_US
dc.typearticleen_US
dc.relation.journalChemical Engineering Journalen_US
dc.contributor.departmentFen Edebiyat Fakültesien_US
dc.contributor.authorID0000-0001-9548-0227en_US
dc.identifier.volume139en_US
dc.identifier.issue2en_US
dc.identifier.startpage213en_US
dc.identifier.endpage223en_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US


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