Kinetic and thermodynamic studies on the adsorption of Cu2+ ions from aqueous solution by using agricultural waste-derived biochars

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dc.contributor.authorKaya, Nihan
dc.contributor.authorArslan, Ferhat
dc.contributor.authorUzun, Zeynep Yildiz
dc.contributor.authorCeylan, Selim
dc.date.accessioned2025-03-23T19:27:14Z
dc.date.available2025-03-23T19:27:14Z
dc.date.issued2020
dc.departmentSinop Üniversitesi
dc.description.abstractIn this study, it was aimed to investigate the adsorption properties of the biochars obtained by pyrolysis of hazelnut and walnut shells for removal of copper ions from aqueous solutions. The characterization of raw biomasses and also biochars were performed using TGA-DTG, FT-IR, BET, SEM, partial and elemental analysis techniques. The optimum conditions were determined by investigating the effect of adsorption parameters (initial concentration, temperature, adsorbent amount, pH, contact time and mixing speed) for efficient removal of copper ions from aqueous solution by batch adsorption experiments carried out under different conditions. The highest adsorption efficiencies were recorded as 82 and 86% respectively for hazelnut and walnut shell biochars at pH 4, C-o = 15 ppm, adsorbent dosage = 3 g/L and mixing speed = 600 rpm. Experimental results showed that the adsorption efficiency for copper ions increased with the increase of temperature (T = 45 degrees C) in studies only using biochar obtained from hazelnut shell. While the time of equilibrium in the aqueous solution containing copper ions was determined to be 75 min for walnut shell char, this duration was 30 min for hazelnut shell char. The experimental results were investigated in terms of Langmuir, Freundlich and Temkin isotherm models. Together with the calculated thermodynamic parameters, the adsorption mechanism was explained. In order to determine the kinetic model of the adsorption process, the experimental data were applied to pseudo first-order, pseudo second-order and intra-particle diffusion models, and the model constants were investigated.
dc.description.sponsorshipHitit University; Ondokuz Mayis University
dc.description.sponsorshipThe authors would like to thank Hitit University and Ondokuz Mayis University for their support.
dc.identifier.doi10.2166/ws.2020.193
dc.identifier.endpage3140
dc.identifier.issn1606-9749
dc.identifier.issn1607-0798
dc.identifier.issue8
dc.identifier.scopus2-s2.0-85098487291
dc.identifier.scopusqualityQ2
dc.identifier.startpage3120
dc.identifier.urihttps://doi.org/10.2166/ws.2020.193
dc.identifier.urihttps://hdl.handle.net/11486/4872
dc.identifier.volume20
dc.identifier.wosWOS:000617140800015
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherIwa Publishing
dc.relation.ispartofWater Supply
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WOS_20250323
dc.subjectadsorption
dc.subjectbiochar
dc.subjectcopper ions
dc.subjecthazelnut shell
dc.subjectpyrolysis
dc.subjectwalnut shell
dc.titleKinetic and thermodynamic studies on the adsorption of Cu2+ ions from aqueous solution by using agricultural waste-derived biochars
dc.typeArticle

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