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
The 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...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-07-01
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| Series: | Environmental Advances |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666765721000272 |
| _version_ | 1818919285656911872 |
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| author | Fabiano Tomazini da Conceição Mariana Scicia Gabriel da Silva Amauri Antonio Menegário Maria Lucia Pereira Antunes Guillermo Rafael Beltran Navarro Alexandre Martins Fernandes Caetano Dorea Rodrigo Braga Moruzzi |
| author_facet | Fabiano Tomazini da Conceição Mariana Scicia Gabriel da Silva Amauri Antonio Menegário Maria Lucia Pereira Antunes Guillermo Rafael Beltran Navarro Alexandre Martins Fernandes Caetano Dorea Rodrigo Braga Moruzzi |
| author_sort | Fabiano Tomazini da Conceição |
| collection | DOAJ |
| description | The 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. |
| first_indexed | 2024-12-20T01:03:26Z |
| format | Article |
| id | doaj.art-478f0ed1760d49d998e02552065ec758 |
| institution | Directory Open Access Journal |
| issn | 2666-7657 |
| language | English |
| last_indexed | 2024-12-20T01:03:26Z |
| publishDate | 2021-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Environmental Advances |
| spelling | doaj.art-478f0ed1760d49d998e02552065ec7582022-12-21T19:58:54ZengElsevierEnvironmental Advances2666-76572021-07-014100056Precipitation as the main mechanism for Cd(II), Pb(II) and Zn(II) removal from aqueous solutions using natural and activated forms of red mudFabiano Tomazini da Conceição0Mariana Scicia Gabriel da Silva1Amauri Antonio Menegário2Maria Lucia Pereira Antunes3Guillermo Rafael Beltran Navarro4Alexandre Martins Fernandes5Caetano Dorea6Rodrigo Braga Moruzzi7Instituto de Geociências e Ciências Exatas, UNESP - Universidade Estadual Paulista, 1 – Avenida 24-A, n° 1515, C. P. 178, CEP 13506-900, Bela Vista, Rio Claro, São Paulo, Brazil; Corresponding author.Instituto de Geociências e Ciências Exatas, UNESP - Universidade Estadual Paulista, 1 – Avenida 24-A, n° 1515, C. P. 178, CEP 13506-900, Bela Vista, Rio Claro, São Paulo, BrazilCentro de Estudos Ambientais, UNESP - Universidade Estadual Paulista, Rio Claro, BrazilInstituto de Ciência e Tecnologia, UNESP - Universidade Estadual Paulista, Sorocaba, BrazilInstituto de Geociências e Ciências Exatas, UNESP - Universidade Estadual Paulista, 1 – Avenida 24-A, n° 1515, C. P. 178, CEP 13506-900, Bela Vista, Rio Claro, São Paulo, BrazilInstituto de Geociências e Ciências Exatas, UNESP - Universidade Estadual Paulista, 1 – Avenida 24-A, n° 1515, C. P. 178, CEP 13506-900, Bela Vista, Rio Claro, São Paulo, BrazilDepartment of Civil Engineering, University of Victoria, Victoria, CanadaInstituto de Geociências e Ciências Exatas, UNESP - Universidade Estadual Paulista, 1 – Avenida 24-A, n° 1515, C. P. 178, CEP 13506-900, Bela Vista, Rio Claro, São Paulo, BrazilThe 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.http://www.sciencedirect.com/science/article/pii/S2666765721000272Brazilian red mudTrace elementsSequential extractionKinetics modelling |
| spellingShingle | Fabiano Tomazini da Conceição Mariana Scicia Gabriel da Silva Amauri Antonio Menegário Maria Lucia Pereira Antunes Guillermo Rafael Beltran Navarro Alexandre Martins Fernandes Caetano Dorea Rodrigo Braga Moruzzi 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 Brazilian red mud Trace elements Sequential extraction Kinetics modelling |
| title | 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | Brazilian red mud Trace elements Sequential extraction Kinetics modelling |
| url | http://www.sciencedirect.com/science/article/pii/S2666765721000272 |
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