Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/27751 https://doi.org/10.1016/j.cherd.2014.11.007 |
Resumo: | The study of each stage of the flocculation process is essential to better understand and predict flocculation mechanisms. The adsorption of cationic polyacrylamide derivatives (C-PAM) onto precipitated calcium carbonate (PCC) has been investigated systematically as a function of the C-PAM characteristics including molar mass, chain architecture, and charge density. The adsorption results show that, for C-PAM of similar molar mass, highly branched architectures reach the equilibrium faster than linear C-PAM. Similarly, the flocculation rate is higher for the branched C-PAM, which may be indicative of the predominance of the bridging mechanism. In terms of the molar mass, lower molar mass leads to lower adsorption rates and slower flocculation. Adsorption isotherms of C-PAM onto precipitated calcium carbonate could be described by the Langmuir isotherm model. The maximum amount of C-PAM that adsorbs on the particle surface as a monolayer, obtained from adsorption tests through the Langmuir isotherm linear fit, could be correlated with the structure of the aggregates, obtained from flocculation experiments. Moreover, a good correlation was obtained between the adsorption results and the kinetics of the first stage of the flocculation process dominated by particle aggregation. |
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Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonateCationic polyacrylamideFlocculationFlocculation mechanismsAdsorptionLangmuir isothermThe study of each stage of the flocculation process is essential to better understand and predict flocculation mechanisms. The adsorption of cationic polyacrylamide derivatives (C-PAM) onto precipitated calcium carbonate (PCC) has been investigated systematically as a function of the C-PAM characteristics including molar mass, chain architecture, and charge density. The adsorption results show that, for C-PAM of similar molar mass, highly branched architectures reach the equilibrium faster than linear C-PAM. Similarly, the flocculation rate is higher for the branched C-PAM, which may be indicative of the predominance of the bridging mechanism. In terms of the molar mass, lower molar mass leads to lower adsorption rates and slower flocculation. Adsorption isotherms of C-PAM onto precipitated calcium carbonate could be described by the Langmuir isotherm model. The maximum amount of C-PAM that adsorbs on the particle surface as a monolayer, obtained from adsorption tests through the Langmuir isotherm linear fit, could be correlated with the structure of the aggregates, obtained from flocculation experiments. Moreover, a good correlation was obtained between the adsorption results and the kinetics of the first stage of the flocculation process dominated by particle aggregation.Elsevier2014-11info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleRASTEIRO, M. G.; PINHEIRO, Ineide; AHMADLOO, Hamideh; HUNKELER, David; GARCIA, Fernando A.; FERREIRA, Paulo; WANDREY, Christine Wandrey – Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate. [Em linha]. ESSN: 1744-3563. "Chemical Engineering Research and Design". In Press (Available online 20 November 2014). Disponível na Internet em:< http://hdl.handle.net/10316/28289>.http://hdl.handle.net/10316/27751RASTEIRO, M. G.; PINHEIRO, Ineide; AHMADLOO, Hamideh; HUNKELER, David; GARCIA, Fernando A.; FERREIRA, Paulo; WANDREY, Christine Wandrey – Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate. [Em linha]. ESSN: 1744-3563. "Chemical Engineering Research and Design". In Press (Available online 20 November 2014). Disponível na Internet em:< http://hdl.handle.net/10316/28289>.http://hdl.handle.net/10316/27751https://doi.org/10.1016/j.cherd.2014.11.007eng0263-8762http://www.sciencedirect.com/science/article/pii/S0263876214004845Rasteiro, Maria G.Pinheiro, IneideAhmadloo, HamidehHunkeler, DavidGarcia, Fernando A. P.Ferreira, PauloWandrey, Christineinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2021-08-31T09:24:58Zoai:estudogeral.uc.pt:10316/27751Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:52:47.526904Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate |
title |
Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate |
spellingShingle |
Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate Rasteiro, Maria G. Cationic polyacrylamide Flocculation Flocculation mechanisms Adsorption Langmuir isotherm |
title_short |
Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate |
title_full |
Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate |
title_fullStr |
Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate |
title_full_unstemmed |
Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate |
title_sort |
Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate |
author |
Rasteiro, Maria G. |
author_facet |
Rasteiro, Maria G. Pinheiro, Ineide Ahmadloo, Hamideh Hunkeler, David Garcia, Fernando A. P. Ferreira, Paulo Wandrey, Christine |
author_role |
author |
author2 |
Pinheiro, Ineide Ahmadloo, Hamideh Hunkeler, David Garcia, Fernando A. P. Ferreira, Paulo Wandrey, Christine |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Rasteiro, Maria G. Pinheiro, Ineide Ahmadloo, Hamideh Hunkeler, David Garcia, Fernando A. P. Ferreira, Paulo Wandrey, Christine |
dc.subject.por.fl_str_mv |
Cationic polyacrylamide Flocculation Flocculation mechanisms Adsorption Langmuir isotherm |
topic |
Cationic polyacrylamide Flocculation Flocculation mechanisms Adsorption Langmuir isotherm |
description |
The study of each stage of the flocculation process is essential to better understand and predict flocculation mechanisms. The adsorption of cationic polyacrylamide derivatives (C-PAM) onto precipitated calcium carbonate (PCC) has been investigated systematically as a function of the C-PAM characteristics including molar mass, chain architecture, and charge density. The adsorption results show that, for C-PAM of similar molar mass, highly branched architectures reach the equilibrium faster than linear C-PAM. Similarly, the flocculation rate is higher for the branched C-PAM, which may be indicative of the predominance of the bridging mechanism. In terms of the molar mass, lower molar mass leads to lower adsorption rates and slower flocculation. Adsorption isotherms of C-PAM onto precipitated calcium carbonate could be described by the Langmuir isotherm model. The maximum amount of C-PAM that adsorbs on the particle surface as a monolayer, obtained from adsorption tests through the Langmuir isotherm linear fit, could be correlated with the structure of the aggregates, obtained from flocculation experiments. Moreover, a good correlation was obtained between the adsorption results and the kinetics of the first stage of the flocculation process dominated by particle aggregation. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-11 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
RASTEIRO, M. G.; PINHEIRO, Ineide; AHMADLOO, Hamideh; HUNKELER, David; GARCIA, Fernando A.; FERREIRA, Paulo; WANDREY, Christine Wandrey – Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate. [Em linha]. ESSN: 1744-3563. "Chemical Engineering Research and Design". In Press (Available online 20 November 2014). Disponível na Internet em:< http://hdl.handle.net/10316/28289>. http://hdl.handle.net/10316/27751 RASTEIRO, M. G.; PINHEIRO, Ineide; AHMADLOO, Hamideh; HUNKELER, David; GARCIA, Fernando A.; FERREIRA, Paulo; WANDREY, Christine Wandrey – Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate. [Em linha]. ESSN: 1744-3563. "Chemical Engineering Research and Design". In Press (Available online 20 November 2014). Disponível na Internet em:< http://hdl.handle.net/10316/28289>. http://hdl.handle.net/10316/27751 https://doi.org/10.1016/j.cherd.2014.11.007 |
identifier_str_mv |
RASTEIRO, M. G.; PINHEIRO, Ineide; AHMADLOO, Hamideh; HUNKELER, David; GARCIA, Fernando A.; FERREIRA, Paulo; WANDREY, Christine Wandrey – Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate. [Em linha]. ESSN: 1744-3563. "Chemical Engineering Research and Design". In Press (Available online 20 November 2014). Disponível na Internet em:< http://hdl.handle.net/10316/28289>. |
url |
http://hdl.handle.net/10316/27751 https://doi.org/10.1016/j.cherd.2014.11.007 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0263-8762 http://www.sciencedirect.com/science/article/pii/S0263876214004845 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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