A kinetics and thermodynamics study of methylene blue adsorption on wheat shells

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dc.contributor.authorBulut, Yasemin
dc.contributor.authorAydin, Haluk
dc.date.accessioned2024-04-24T16:11:15Z
dc.date.available2024-04-24T16:11:15Z
dc.date.issued2006
dc.departmentDicle Üniversitesien_US
dc.description.abstractThe use of wheat shells (WMS) for the removal of methylene blue from aqueous solutions at different contact times, temperatures, pH, adsorbent doses and initial dye concentration was investigated. The adsorption process attains equilibrium within 60 min. The extent of dye removal decreased with increasing adsorbent dosage and also increased with increasing contact time, temperature, and in solution concentration. The adsorption isotherms are described by means of the Langmuir and Freundlich isotherms. It was found that the Langmuir equation fit better than the Freundlich equation. Maximum adsorption capacity (Q(m)) was calculated at different temperatures (303, 313, and 323 K) 16.56, 20.83, and 21.50 mg/g, respectively. The adsorption kinetics of methylene blue could be described by the pseudo-second-order reaction model. The activation energy of system (E-a) was calculated as 16.62 kJ/mol. Free energy of adsorption (Delta G(0)), enthalpy (Delta H-0), and entropy (Delta S-0) changes were calculated to predict the nature of adsorption. The estimated values for Delta G(0) were -22.64, -24.11, and -26.35 kJ/mol at 303, 313, and 323 K, respectively, which are rather low, indicating that a spontaneous process occurred. The enthalpy changes and entropy of adsorption were 33.41 kJ/mol and 185 J/mol K, respectively. The obtained results are: (1) high levels of color removal (> 95%) were achieved with low contact times adsorbent/dye (less than 90-min contact); and (2) the whole WHS can be successfully used as adsorbent of methylene blue in aqueous solutions. WHS, an inexpensive and easily available material, can be an alternative for more costly adsorbents used for dye removal in wastewater treatment processes.en_US
dc.identifier.doi10.1016/j.desal.2005.10.032
dc.identifier.endpage267en_US
dc.identifier.issn0011-9164
dc.identifier.issn1873-4464
dc.identifier.issue1-3en_US
dc.identifier.scopus2-s2.0-33747269461
dc.identifier.scopusqualityQ1
dc.identifier.startpage259en_US
dc.identifier.urihttps://doi.org/10.1016/j.desal.2005.10.032
dc.identifier.urihttps://hdl.handle.net/11468/15328
dc.identifier.volume194en_US
dc.identifier.wosWOS:000238712500025
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.ispartofDesalination
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectAdsorptionen_US
dc.subjectIsothermen_US
dc.subjectMethylene Blueen_US
dc.subjectWheat Shellsen_US
dc.subjectDye Adsorptionen_US
dc.subjectKinetics Of Adsorptionen_US
dc.subjectThermodynamicsen_US
dc.titleA kinetics and thermodynamics study of methylene blue adsorption on wheat shellsen_US
dc.titleA kinetics and thermodynamics study of methylene blue adsorption on wheat shells
dc.typeArticleen_US

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