Mecanismos de remoção de metais pesados em argila bentonita
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da Universidade Estadual de Maringá (RI-UEM) |
Texto Completo: | http://repositorio.uem.br:8080/jspui/handle/1/3781 |
Resumo: | One of the prominent global concerns is the quality of water available infountains, as the population and industrial growth has caused serious pollution in rivers and other water bodies. In this sense, several technologies have been proposed as a treatment of this water. The process investigated in this work is based on the sorption of heavy metals highly toxic ions Cd2+ Zn 2+ and Pb 2+, present in industrial, urban and mining wastewater. Among the sorbents available, excel up the clays. The Bofe bentonite clay is one of types of clays and is residual resulting from the extraction process Gypsum mining, hence it become low-cost material compared to other sorbents. When the bentonite clay is enrichedwith Ca2+, this material has acquired greater stability. From that, this dissertation aimed to investigate the basic mechanisms involved in the sorption ofcalcined BofeCa-bentonite clay via batch system.The ion exchange and adsorption mechanism was investigated as well as its predominance in removalof these metals at temperatures ranges of 20 to 50 °C. For this, B.E.T, XRD and TGA analyzes were carried out to characterize the material.Kinetic and sorption isotherms were obtained which itsdata were used for isothermaland kineticsmodeling, focusing on both adsorption and ion exchangeapproaches. In this context, the model of pseudo-second order kinetic responded better to the data while the isothermal process achieved good results with the Langmuir model. The ion exchange mechanism was predominant in terms of percentage removal for all metals studied. The sequence selectivity order obtained of Pb> Zn> Cd is linked to the electronegativity and hydrolysis constant of each metals. Moreover, it can be concluded that the Bofe Ca-bentonite clay is more efficient in removing the metals Pb, Zn andCd in aqueous solutions between temperatures 30 and 40 °C. This outcome was obtained by analysis of the thermodynamic properties,which were derived from isothermal models. |
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Mecanismos de remoção de metais pesados em argila bentonitaArgila bentonitaRemoção de metais pesadosTroca iônicaAdsorçãoBrasil.Bentonite clayIon exchangeAdsorptionRemoval of heavy metalsBrazil.EngenhariasEngenharia QuímicaOne of the prominent global concerns is the quality of water available infountains, as the population and industrial growth has caused serious pollution in rivers and other water bodies. In this sense, several technologies have been proposed as a treatment of this water. The process investigated in this work is based on the sorption of heavy metals highly toxic ions Cd2+ Zn 2+ and Pb 2+, present in industrial, urban and mining wastewater. Among the sorbents available, excel up the clays. The Bofe bentonite clay is one of types of clays and is residual resulting from the extraction process Gypsum mining, hence it become low-cost material compared to other sorbents. When the bentonite clay is enrichedwith Ca2+, this material has acquired greater stability. From that, this dissertation aimed to investigate the basic mechanisms involved in the sorption ofcalcined BofeCa-bentonite clay via batch system.The ion exchange and adsorption mechanism was investigated as well as its predominance in removalof these metals at temperatures ranges of 20 to 50 °C. For this, B.E.T, XRD and TGA analyzes were carried out to characterize the material.Kinetic and sorption isotherms were obtained which itsdata were used for isothermaland kineticsmodeling, focusing on both adsorption and ion exchangeapproaches. In this context, the model of pseudo-second order kinetic responded better to the data while the isothermal process achieved good results with the Langmuir model. The ion exchange mechanism was predominant in terms of percentage removal for all metals studied. The sequence selectivity order obtained of Pb> Zn> Cd is linked to the electronegativity and hydrolysis constant of each metals. Moreover, it can be concluded that the Bofe Ca-bentonite clay is more efficient in removing the metals Pb, Zn andCd in aqueous solutions between temperatures 30 and 40 °C. This outcome was obtained by analysis of the thermodynamic properties,which were derived from isothermal models.Uma das proeminentes preocupações mundiais é a qualidade das águas disponível em mananciais, pois o avanço populacional e industrial tem causado grande poluição em rios e demais corpos d'água. Neste sentido, várias tecnologias têm sido propostas comoforma de tratamento desta água. O processo investigadono presente trabalho baseia-se na sorção de metais pesados altamente tóxicos, os íons Cd2+,Zn2+e Pb2+, presentes em efluentes industriais, urbanos e de mineração. Entre os sorventes disponíveis, destacam-se as argilas. A argila bentonita do tipo Bofe é uma das argilas, e é resíduo decorrente do processo extrativo de mineração de Gipsita com custo inferior a outros sorventes. Com tratamento para enriquecer a bentonita com Ca2+, este material adquiriu maior estabilidade no processo de sorção. A partir disso, esta dissertação visou investigar os principais mecanismos envolvidos no processo de sorção na argila bentonita calcinada cálcica do tipo bofe via batelada. Investigaram-se os mecanismos de troca iônica e adsorção e suas predominâncias na remoção dos metais para as temperaturas de 20 a 50 °C. Para tal, foram realizadas análises de caracterização como B.E.T, DRX e TGA. Obtiveram-se cinéticas e isotermas de sorção que serviram de dados para a modelagem cinética e isotérmica, enfocando tanto uma abordagem adsortiva como de troca iônica. Neste contexto, o modelo de pseudo-segunda ordem respondeu melhor aos dados cinéticos enquanto que o processo isotérmico obteve bons resultados com o modelo de Langmuir. O mecanismo de troca iônica foi predominante em termos percentuais de remoção para todos os metais estudados. Obteve-se ordem de seletividade de sequência Pb> Zn > Cd, a qual está vinculada às eletronegatividade e constante de hidrólise de cada metal. Ademais, pode-se concluir que a argila bentonita cálcica Bofe é mais eficiente na remoção dos metais Cd, Pb e Zn em soluções aquosas entre as temperaturas 30 e 40 °C. Resultado este obtido pela análise das propriedades termodinâmicas que derivam dos modelos isotérmicos.xiii, 95 fUniversidade Estadual de MaringáBrasilDepartamento de Engenharia QuímicaPrograma de Pós-Graduação em Engenharia QuímicaUEMMaringá, PRCentro de TecnologiaMaria Angélica Simões Dornellas de BarrosMarcelino luiz Gimenes [Orientador] - UEMPedro Augusto Arroyo - UEMMelissa Gurgel Adeodato Vieira - UNICAMPEneida Sala Cossich - UEMSallo, Fernando da Silva2018-04-17T17:43:54Z2018-04-17T17:43:54Z2012info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesishttp://repositorio.uem.br:8080/jspui/handle/1/3781porinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da Universidade Estadual de Maringá (RI-UEM)instname:Universidade Estadual de Maringá (UEM)instacron:UEM2024-03-25T20:40:35Zoai:localhost:1/3781Repositório InstitucionalPUBhttp://repositorio.uem.br:8080/oai/requestopendoar:2024-04-23T14:56:56.145942Repositório Institucional da Universidade Estadual de Maringá (RI-UEM) - Universidade Estadual de Maringá (UEM)false |
dc.title.none.fl_str_mv |
Mecanismos de remoção de metais pesados em argila bentonita |
title |
Mecanismos de remoção de metais pesados em argila bentonita |
spellingShingle |
Mecanismos de remoção de metais pesados em argila bentonita Sallo, Fernando da Silva Argila bentonita Remoção de metais pesados Troca iônica Adsorção Brasil. Bentonite clay Ion exchange Adsorption Removal of heavy metals Brazil. Engenharias Engenharia Química |
title_short |
Mecanismos de remoção de metais pesados em argila bentonita |
title_full |
Mecanismos de remoção de metais pesados em argila bentonita |
title_fullStr |
Mecanismos de remoção de metais pesados em argila bentonita |
title_full_unstemmed |
Mecanismos de remoção de metais pesados em argila bentonita |
title_sort |
Mecanismos de remoção de metais pesados em argila bentonita |
author |
Sallo, Fernando da Silva |
author_facet |
Sallo, Fernando da Silva |
author_role |
author |
dc.contributor.none.fl_str_mv |
Maria Angélica Simões Dornellas de Barros Marcelino luiz Gimenes [Orientador] - UEM Pedro Augusto Arroyo - UEM Melissa Gurgel Adeodato Vieira - UNICAMP Eneida Sala Cossich - UEM |
dc.contributor.author.fl_str_mv |
Sallo, Fernando da Silva |
dc.subject.por.fl_str_mv |
Argila bentonita Remoção de metais pesados Troca iônica Adsorção Brasil. Bentonite clay Ion exchange Adsorption Removal of heavy metals Brazil. Engenharias Engenharia Química |
topic |
Argila bentonita Remoção de metais pesados Troca iônica Adsorção Brasil. Bentonite clay Ion exchange Adsorption Removal of heavy metals Brazil. Engenharias Engenharia Química |
description |
One of the prominent global concerns is the quality of water available infountains, as the population and industrial growth has caused serious pollution in rivers and other water bodies. In this sense, several technologies have been proposed as a treatment of this water. The process investigated in this work is based on the sorption of heavy metals highly toxic ions Cd2+ Zn 2+ and Pb 2+, present in industrial, urban and mining wastewater. Among the sorbents available, excel up the clays. The Bofe bentonite clay is one of types of clays and is residual resulting from the extraction process Gypsum mining, hence it become low-cost material compared to other sorbents. When the bentonite clay is enrichedwith Ca2+, this material has acquired greater stability. From that, this dissertation aimed to investigate the basic mechanisms involved in the sorption ofcalcined BofeCa-bentonite clay via batch system.The ion exchange and adsorption mechanism was investigated as well as its predominance in removalof these metals at temperatures ranges of 20 to 50 °C. For this, B.E.T, XRD and TGA analyzes were carried out to characterize the material.Kinetic and sorption isotherms were obtained which itsdata were used for isothermaland kineticsmodeling, focusing on both adsorption and ion exchangeapproaches. In this context, the model of pseudo-second order kinetic responded better to the data while the isothermal process achieved good results with the Langmuir model. The ion exchange mechanism was predominant in terms of percentage removal for all metals studied. The sequence selectivity order obtained of Pb> Zn> Cd is linked to the electronegativity and hydrolysis constant of each metals. Moreover, it can be concluded that the Bofe Ca-bentonite clay is more efficient in removing the metals Pb, Zn andCd in aqueous solutions between temperatures 30 and 40 °C. This outcome was obtained by analysis of the thermodynamic properties,which were derived from isothermal models. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012 2018-04-17T17:43:54Z 2018-04-17T17:43:54Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.uem.br:8080/jspui/handle/1/3781 |
url |
http://repositorio.uem.br:8080/jspui/handle/1/3781 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Universidade Estadual de Maringá Brasil Departamento de Engenharia Química Programa de Pós-Graduação em Engenharia Química UEM Maringá, PR Centro de Tecnologia |
publisher.none.fl_str_mv |
Universidade Estadual de Maringá Brasil Departamento de Engenharia Química Programa de Pós-Graduação em Engenharia Química UEM Maringá, PR Centro de Tecnologia |
dc.source.none.fl_str_mv |
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Universidade Estadual de Maringá (UEM) |
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UEM |
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Repositório Institucional da Universidade Estadual de Maringá (RI-UEM) |
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Repositório Institucional da Universidade Estadual de Maringá (RI-UEM) - Universidade Estadual de Maringá (UEM) |
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