Utilization of shells of hazelnut modified with Reactive Orange 122 as adsorbent for the removal of Cu(II)

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dc.contributor.authorAydin, Haluk
dc.contributor.authorYerlikaya, Cigdem
dc.date.accessioned2024-04-24T17:24:49Z
dc.date.available2024-04-24T17:24:49Z
dc.date.issued2010
dc.departmentDicle Üniversitesien_US
dc.description.abstractThe influence of reactive dye modification on the efficiency of adsorption capacities of hazelnut shells was investigated. To that end, natural adsorbents such as shells of unmodified hazelnut (RH), and modified hazelnut (MH) were used. The removal of Cu(II) by these adsorbents from aqueous solution was investigated by using several parameters such as modification, contact time, temperature and pH. The adsorption process attained equilibrium within 60 min. The extent of Cu(II) removal increased with increasing the contact time, temperature and pH and also with modification by Reactive Orange 122 as the adsorbent. Optimum pH value for Cu(II) adsorption was determined between 4-5. The experimental data were analysed by the Langmuir and Freundlich models of adsorption. It was found that the Langmuir equation fited better than the Freundlich equation. The maximum adsorption capacities for Cu(II) onto RH and MH at 298, 308 and 318 K were found to be 3.95, 4.65, and 4.74, 7.00, 8.12 and 8.61 mg/g, respectively. In addition, the adsorption data obtained at different temperatures of Cu(II) by adsorbents were applied to the pseudo first-order, pseudo second-order and Weber-Morris equations, and the rate constants of the first-order adsorption (k(1)), the rate constants of the 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 the pseudo second-order kinetics with good correlation (R-2 >= 0.991). The data obtained from the adsorption isotherms at different temperatures were used to calculate some thermodynamic quantities such as free energy of adsorption (Delta G degrees), enthalpy (Delta H degrees) and entropy (Delta S degrees). It is expected that Delta G degrees is negative, indicating that the nature of the adsorption process for Cu(II) is spontaneous. The positive value of Delta H degrees indicates that the adsorption of Cu(II) onto adsorbents is an endothermic process. The positive value of Delta So reflects the affinity of the adsorbent for Cu(II). As a result, the hazelnut shells (both modified and unmodified), inexpensive and easily available material, can be an alternative for more costly adsorbents used for Cu((II) removal from wastewater.en_US
dc.identifier.doi10.5004/dwt.2010.1228
dc.identifier.endpage132en_US
dc.identifier.issn1944-3994
dc.identifier.issn1944-3986
dc.identifier.issue1-3en_US
dc.identifier.scopus2-s2.0-77958016000
dc.identifier.scopusqualityQ3
dc.identifier.startpage123en_US
dc.identifier.urihttps://doi.org/10.5004/dwt.2010.1228
dc.identifier.urihttps://hdl.handle.net/11468/19842
dc.identifier.volume20en_US
dc.identifier.wosWOS:000281958700015
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoenen_US
dc.publisherDesalination Publen_US
dc.relation.ispartofDesalination and Water Treatment
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectAdsorptionen_US
dc.subjectAdsorbentsen_US
dc.subjectHazelnut Shellen_US
dc.subjectKineticsen_US
dc.subjectThermodynamicsen_US
dc.subjectModificationen_US
dc.subjectIsothermen_US
dc.titleUtilization of shells of hazelnut modified with Reactive Orange 122 as adsorbent for the removal of Cu(II)en_US
dc.titleUtilization of shells of hazelnut modified with Reactive Orange 122 as adsorbent for the removal of Cu(II)
dc.typeArticleen_US

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