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Low cost modified biochars from peanut shells for the removal of textile dyes

2023-06Research article Open access
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authorProfile.emailbiblioteca@isel.pt
datacite.subject.fosEngenharia e Tecnologia::Engenharia Química
dc.contributor.authorNunes, Nelson
dc.contributor.authorSantos, Maria Teresa
dc.contributor.authorMartins, Angela
dc.date.accessioned2025-08-22T09:29:29Z
dc.date.available2025-08-22T09:29:29Z
dc.date.issued2023-06
dc.description.abstractBiochars from peanut shell wastes were produced and further modified with KOH and HNO3 to efficiently remove two industrial dyes, Mordant Orange 1 and Green Malachite oxalate, in aqueous systems. The materials were characterized through elemental analysis, N2 adsorption isotherms, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and the determination of the point of zero charge, pHPZC. The basic and, particularly, the acid treatments increased the specific surface area by 15 and 43%, respectively, and the pHPZC shifted from 6.2 to 9.1 or 3.3 upon treatments with KOH or HNO3. These modifications impacted the adsorption behavior of the dyes; in the case of Mordant Orange 1, the adsorption capacity increased 2 and 4 times, respectively, when compared with the parent biochar. These results show that the performance of biochars can improve substantially through simple modifications using acid or basic treatments that not only increase the specific surface area but also modify adsorbent/adsorbate interactions.eng
dc.identifier.citationNunes, N., Santos, M. T., & Martins, A. (2023). Low cost modified biochars from peanut shells for the removal of textile dyes. Journal of the Brazilian Chemical Society, 34(6), 885-893. https://doi.org/10.21577/0103-5053.20220156
dc.identifier.doihttps://doi.org/10.21577/0103-5053.20220156
dc.identifier.eissn1678-4790
dc.identifier.issn0103-5053
dc.identifier.urihttp://hdl.handle.net/10400.21/22024
dc.language.isoeng
dc.peerreviewedyes
dc.publisherSociedade Brasileira Química
dc.relationUIDB/00100/2020
dc.relationUIDP/00100/2020
dc.relationLA/P/0056/2020
dc.relation.hasversionhttps://jbcs.sbq.org.br/pdf/2022-0252AR
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectAlkali or acid treatment
dc.subjectBiochars
dc.subjectPeanut shells
dc.subjectPyrolysis
dc.subjectDye adsorption
dc.titleLow cost modified biochars from peanut shells for the removal of textile dyeseng
dc.typeresearch article
dspace.entity.typePublication
oaire.citation.endPage893
oaire.citation.issue6
oaire.citation.startPage885
oaire.citation.titleJournal of the Brazilian Chemical Society
oaire.citation.volume34
oaire.versionhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43
person.familyNameSantos
person.familyNameMartins
person.givenNameMaria Teresa
person.givenNameAngela
person.identifier.ciencia-id781F-79D3-9070
person.identifier.orcid0000-0001-8976-6691
person.identifier.orcid0000-0003-1637-478X
person.identifier.ridB-1775-2012
person.identifier.scopus-author-id7203013509
relation.isAuthorOfPublicationaca23960-3487-4dc2-8561-6cdcb5a097f1
relation.isAuthorOfPublication61c012c2-e555-4d7e-8fad-27b1facc34ca
relation.isAuthorOfPublication.latestForDiscovery61c012c2-e555-4d7e-8fad-27b1facc34ca

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