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Ideal pH for the adsorption of metal ions Cr 6 + , Ni 2 + , Pb 2 + in aqueous solution with di ff erent adsorbent materials

2021Journal article Open access
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dc.contributor.authorCruz-Lopes, Luísa
dc.contributor.authorMacena, Morgana
dc.contributor.authorEsteves, Bruno
dc.contributor.authorGuiné, Raquel
dc.date.accessioned2021-03-05T09:43:25Z
dc.date.available2021-03-05T09:43:25Z
dc.date.issued2021
dc.description.abstractIndustrialization increases the number of heavy metals released into the environment. Lead ( Pb 2 + ) , nickel ( Ni 2 + ) and chromium ( Cr 6 + ) are among these toxic metals and cause irreversible e ff ects on ecosystems and human health due to their bio - accumulative potential. The decontamination through adsorption processes using lignocellulosic wastes from agricultural and/or forestry processes is a viable solution. Hence, this work aimed at studying the e ff ect of pH on the biosorption of the metal ions using four di ff erent by - product materials: walnut shell, chestnut shell, pinewood and burnt pine - wood. These experiments were conducted with solutions of the three heavy metals in which the adsorbents were immersed to measure the rate of adsorption. A range of pH values from 3.0 to 7.5 was used in the experiments, and the concentrations were determined by atomic absorption. The results showed di ff erent behaviour of the biosorbent materials when applied to the di ff erent metals. The lead adsorption had an ideal pH in the range of 5.5 – 7.5 when the walnut shell was used as an adsor - bent, corresponding to values of adsorption greater than 90%, but for the other materials, maximum adsorption occurred for a pH of 7.5. For the adsorption of chromium, the pH was very heterogeneous with all adsorbents, with optimal values of pH varying from 3.0 ( for chestnut shell ) to 6.5 ( for walnut shell and wood ) . For nickel, the best pH range was around pH 5, with di ff erent values according to the lignocellulosic material used. These results indicate that the tested biosorbents have the potential to decon - taminate wastewater in variable extensions and that by controlling the pH of the solution; a more e ffi cient removal of the heavy metals can be achieved.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCruz-Lopes LP, Macena M, Esteves B, Guiné RPF. (2021) Ideal pH for the adsorption of metal ions Cr6+, Ni2+, Pb2+ in aqueous solution with different adsorbent materials. Open Agriculture, 6(1), 115-123.pt_PT
dc.identifier.doi10pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.19/6656
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.subjectBiosorptionpt_PT
dc.subjectChromiumpt_PT
dc.subjectNickelpt_PT
dc.subjectLeadpt_PT
dc.subjectChestnut shellpt_PT
dc.subjectBurnt woodpt_PT
dc.titleIdeal pH for the adsorption of metal ions Cr 6 + , Ni 2 + , Pb 2 + in aqueous solution with di ff erent adsorbent materialspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage123pt_PT
oaire.citation.issue1pt_PT
oaire.citation.startPage115pt_PT
oaire.citation.titleOpen Agriculturept_PT
oaire.citation.volume6pt_PT
person.familyNameGonçalves Oliveira Valente da Cruz-Lopes
person.familyNameWeber Macena
person.familyNameEsteves
person.familyNamede Pinho Ferreira Guiné
person.givenNameLuísa Paula
person.givenNameMorgana
person.givenNameBruno
person.givenNameRaquel
person.identifier2119255
person.identifierhttps://scholar.google.pt/citations?user=abFDovIAAAAJ&hl=pt-PT
person.identifier.ciencia-id7916-0833-5B38
person.identifier.ciencia-idA61B-D50C-0F63
person.identifier.ciencia-id521B-63A7-B248
person.identifier.ciencia-id8B13-5492-0F23
person.identifier.orcid0000-0001-6502-7202
person.identifier.orcid0000-0002-2833-5465
person.identifier.orcid0000-0001-6660-3128
person.identifier.orcid0000-0003-0595-6805
person.identifier.ridC-2173-2012
person.identifier.scopus-author-id57202554441
person.identifier.scopus-author-id6603138390
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication10013a79-9951-472d-98c3-76f4086472cf
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relation.isAuthorOfPublication.latestForDiscovery59580952-77cc-4e4e-ae90-527a8b994f9f

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