Equilibrium and kinetics studies for adsorption of direct blue 71 from aqueous solution by wheat shells

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dc.contributor.authorBulut, Yasemin
dc.contributor.authorGozubenli, Numan
dc.contributor.authorAydin, Haluk
dc.date.accessioned2024-04-24T16:15:06Z
dc.date.available2024-04-24T16:15:06Z
dc.date.issued2007
dc.departmentDicle Üniversitesien_US
dc.description.abstractThis paper deals with the application of wheat shells (WS), an agricultural by-product, for the removal of direct blue 71 (DR) from aqueous solution. The characteristics of WS surface, such as surface area, Bohem titration and scanning electron microscopy (SEM) were obtained. The removal of direct blue 71 onto WS from aqueous solution was investigated by using parameters, such as pH, temperature, adsorbent dose, contact time and initial concentration. The adsorption process attains equilibrium within 36h. The extent of dye removal decreased with increasing adsorbent dosage and also increased with increasing contact time, temperature, in solution concentration. Optimum pH value for dye adsorption was determined between 6 and 8. The experimental data were analysed by the Langmuir and Freundlich models of adsorption. It was found that the Langmuir equation fit better than the Freundlich equation. Maximum adsorption capacity (Qm) was calculated as at different temperatures (293, 303 and 313 K) 40.82, 45.66 and 46.30 mg g(-1), respectively. In addition, the adsorption data obtained at different temperatures of DR by WS were applied to pseudo first-order, pseudo second-order and Weber-Morris equations, and the rate constants of first-order adsorption (kj), the rate constants of second-order adsorption (k(2)) and intraparticle diffusion rate constants (k(3)) at these temperatures were calculated, respectively. The rates of adsorption were found to conform to pseudo second-order kinetics with good correlation (R-2 > 0.9904). Also, free energy of adsorption (Delta G degrees), enthalpy (Delta H degrees), and entropy (Delta S degrees) changes were determined to predict the nature of adsorption. Furthermore, the results indicate that WS could be employed as a low-cost alternative to other adsorbents in the removal of direct blue 71 from aqueous solution. (C) 2006 Elsevier B.V. All rights reserved.en_US
dc.identifier.doi10.1016/j.jhazmat.2006.10.027
dc.identifier.endpage306en_US
dc.identifier.issn0304-3894
dc.identifier.issue1-2en_US
dc.identifier.pmid17118540
dc.identifier.scopus2-s2.0-34248155740
dc.identifier.scopusqualityQ1
dc.identifier.startpage300en_US
dc.identifier.urihttps://doi.org/10.1016/j.jhazmat.2006.10.027
dc.identifier.urihttps://hdl.handle.net/11468/15648
dc.identifier.volume144en_US
dc.identifier.wosWOS:000247197100039
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoenen_US
dc.publisherElsevier Science Bven_US
dc.relation.ispartofJournal of Hazardous Materials
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectAdsorptionen_US
dc.subjectKineticsen_US
dc.subjectThermodynamicsen_US
dc.subjectDyesen_US
dc.subjectDirect Dyesen_US
dc.subjectWheat Shellsen_US
dc.titleEquilibrium and kinetics studies for adsorption of direct blue 71 from aqueous solution by wheat shellsen_US
dc.titleEquilibrium and kinetics studies for adsorption of direct blue 71 from aqueous solution by wheat shells
dc.typeArticleen_US

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