Precipitation as the main mechanism for Cd(II), Pb(II) and Zn(II) removal from aqueous solutions using natural and activated forms of red mud

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dc.contributor.authorde Conceicao, Fabiano Tomazini
dc.contributor.authorda Silva, Mariana Scicia Gabriel
dc.contributor.authorMenegario, Amauri Antonio
dc.contributor.authorAntunes, Maria Lucia Pereira
dc.contributor.authorNavarro, Guillermo Rafael Beltran
dc.contributor.authorFernandes, Alexandre Martins
dc.contributor.authorDorea, Caetano C.
dc.contributor.authorMoruzzi, Rodrigo Braga
dc.date.accessioned2021-05-18T20:26:39Z
dc.date.available2021-05-18T20:26:39Z
dc.date.copyright2021en_US
dc.date.issued2021
dc.description.abstractThe red mud (RM) has been used as an alternative low-cost adsorbent to remove trace elements, with the adsorption onto sodalite surface described as the main removal mechanism for trace elements. However, recent studies have shown that precipitation might be of great importance for some trace metals removal using natural and thermal activated RM. Therefore, the aim of this study was to identify the main mechanism responsible for Cd(II), Pb(II) and Zn(II) removal from aqueous solutions using natural and activated forms of RM, based on sequential extractions and a precipitation kinetic model was developed. Results showed that the carbonate fraction was responsible for the highest trace elements removal (ca. 85%), with the minerals assemblages precipitated: otavite – CdCO3, cerussite - PbCO3, smithsonite - ZnCO3 and anglesite - PbSO4. The kinetic model showed that the mineral precipitation was limit due to the HCO3− consumption during the formation of new minerals. Hence, this study showed that precipitation was the central mechanism on trace elements removal, regardless the natural or activated forms of RM. This finding raise doubt about the effectiveness of the traditional adsorption isotherms and kinetics models to describe trace metals removal using RM, contributing with new insights for future researches involving these hazardous materials.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipThe authors thank the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP - Processes No. 2009/02374-0 and 2013/00994-6) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq - Process No. 480555/2009-5) for financial support. Dr. Moruzzi is also grateful to CNPq for grant awarded 301210/2018-7. We thank all the referees for their detailed and insightful review's comments, whom helped to improve the manuscript.en_US
dc.identifier.citationda Conceição, F. T., da Silva, M. S. G., Menegário, A. A., Antunes, M. L. P., Navarro, G. R. B., Dorea, C., … Moruzzi, R. B. (2021). Precipitation as the main mechanism for Cd(II), Pb(II) and Zn(II) removal from aqueous solutions using natural and activated forms of red mud. Environmental Advances, 4, 1-10. https://doi.org/10.1016/j.envadv.2021.100056.en_US
dc.identifier.urihttps://doi.org/10.1016/j.envadv.2021.100056
dc.identifier.urihttp://hdl.handle.net/1828/12979
dc.language.isoenen_US
dc.publisherEnvironmental Advancesen_US
dc.subjectBrazilian red mud
dc.subjectTrace elements
dc.subjectSequential extraction
dc.subjectKinetics modelling
dc.subject.departmentDepartment of Civil Engineering
dc.titlePrecipitation as the main mechanism for Cd(II), Pb(II) and Zn(II) removal from aqueous solutions using natural and activated forms of red muden_US
dc.typeArticleen_US

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