APLICAÇÃO DE POLÍMEROS NA FLOCULAÇÃO DE REJEITO DE CAULIM: EFEITOS DA VARIAÇÃO DE CONCENTRAÇÃO E TIPO DE FLOCULANTE
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Química Nova (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422022000500543 |
Resumo: | This study assessed the effects of volume concentration (0.3%, 0.6%, 1.2%, and 12% v/v) and type of polymer flocculant (acrylamide, chitosan, and purified and non-purified acrylamide grafted chitosan) on the flocculation mechanism of kaolinite-rich mining tailings samples. We measured the flocculated samples’ transmittance using UV-VIS spectrometry to check for particles in the supernatant medium in order to verify the flocculation efficiency. It was observed that flocculation directly depends on the pH of the medium, the isoelectric point of the kaolinite, and the polymer chains’ molecular mass. The concentration of H+ and OH- ions is responsible for producing charges of different electrical nature on the particles present in the suspension, thereby affecting the flocculation process. In the acrylamide samples, the aggregation of particles occurs by electrostatic interaction; and in the other samples by bridging, suggesting that the chains’ molecular mass interferes in the coagulation and flocculation mechanisms. Moreover, the results of absorbance measurements and flocs’ apparent density highlight that the grafting of acrylamide on the chitosan chain may improve the kaolin waste flocculation. For flocculant concentrations of up to 1.2% (v/v), the absorbances were mostly below 1.0, indicating removal of suspended materials. |
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APLICAÇÃO DE POLÍMEROS NA FLOCULAÇÃO DE REJEITO DE CAULIM: EFEITOS DA VARIAÇÃO DE CONCENTRAÇÃO E TIPO DE FLOCULANTEchitosannatural flocculantacrylamidebiopolymerchemical functionalizationThis study assessed the effects of volume concentration (0.3%, 0.6%, 1.2%, and 12% v/v) and type of polymer flocculant (acrylamide, chitosan, and purified and non-purified acrylamide grafted chitosan) on the flocculation mechanism of kaolinite-rich mining tailings samples. We measured the flocculated samples’ transmittance using UV-VIS spectrometry to check for particles in the supernatant medium in order to verify the flocculation efficiency. It was observed that flocculation directly depends on the pH of the medium, the isoelectric point of the kaolinite, and the polymer chains’ molecular mass. The concentration of H+ and OH- ions is responsible for producing charges of different electrical nature on the particles present in the suspension, thereby affecting the flocculation process. In the acrylamide samples, the aggregation of particles occurs by electrostatic interaction; and in the other samples by bridging, suggesting that the chains’ molecular mass interferes in the coagulation and flocculation mechanisms. Moreover, the results of absorbance measurements and flocs’ apparent density highlight that the grafting of acrylamide on the chitosan chain may improve the kaolin waste flocculation. For flocculant concentrations of up to 1.2% (v/v), the absorbances were mostly below 1.0, indicating removal of suspended materials.Sociedade Brasileira de Química2022-05-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422022000500543Química Nova v.45 n.5 2022reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.21577/0100-4042.20170862info:eu-repo/semantics/openAccessMartins,Giuliano S.Batista,Ana Maria M.Siqueira,Juliano C. deSiniscalchi,Luciene A. B.Oréfice,Rodrigo L.por2022-07-18T00:00:00Zoai:scielo:S0100-40422022000500543Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2022-07-18T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
APLICAÇÃO DE POLÍMEROS NA FLOCULAÇÃO DE REJEITO DE CAULIM: EFEITOS DA VARIAÇÃO DE CONCENTRAÇÃO E TIPO DE FLOCULANTE |
title |
APLICAÇÃO DE POLÍMEROS NA FLOCULAÇÃO DE REJEITO DE CAULIM: EFEITOS DA VARIAÇÃO DE CONCENTRAÇÃO E TIPO DE FLOCULANTE |
spellingShingle |
APLICAÇÃO DE POLÍMEROS NA FLOCULAÇÃO DE REJEITO DE CAULIM: EFEITOS DA VARIAÇÃO DE CONCENTRAÇÃO E TIPO DE FLOCULANTE Martins,Giuliano S. chitosan natural flocculant acrylamide biopolymer chemical functionalization |
title_short |
APLICAÇÃO DE POLÍMEROS NA FLOCULAÇÃO DE REJEITO DE CAULIM: EFEITOS DA VARIAÇÃO DE CONCENTRAÇÃO E TIPO DE FLOCULANTE |
title_full |
APLICAÇÃO DE POLÍMEROS NA FLOCULAÇÃO DE REJEITO DE CAULIM: EFEITOS DA VARIAÇÃO DE CONCENTRAÇÃO E TIPO DE FLOCULANTE |
title_fullStr |
APLICAÇÃO DE POLÍMEROS NA FLOCULAÇÃO DE REJEITO DE CAULIM: EFEITOS DA VARIAÇÃO DE CONCENTRAÇÃO E TIPO DE FLOCULANTE |
title_full_unstemmed |
APLICAÇÃO DE POLÍMEROS NA FLOCULAÇÃO DE REJEITO DE CAULIM: EFEITOS DA VARIAÇÃO DE CONCENTRAÇÃO E TIPO DE FLOCULANTE |
title_sort |
APLICAÇÃO DE POLÍMEROS NA FLOCULAÇÃO DE REJEITO DE CAULIM: EFEITOS DA VARIAÇÃO DE CONCENTRAÇÃO E TIPO DE FLOCULANTE |
author |
Martins,Giuliano S. |
author_facet |
Martins,Giuliano S. Batista,Ana Maria M. Siqueira,Juliano C. de Siniscalchi,Luciene A. B. Oréfice,Rodrigo L. |
author_role |
author |
author2 |
Batista,Ana Maria M. Siqueira,Juliano C. de Siniscalchi,Luciene A. B. Oréfice,Rodrigo L. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Martins,Giuliano S. Batista,Ana Maria M. Siqueira,Juliano C. de Siniscalchi,Luciene A. B. Oréfice,Rodrigo L. |
dc.subject.por.fl_str_mv |
chitosan natural flocculant acrylamide biopolymer chemical functionalization |
topic |
chitosan natural flocculant acrylamide biopolymer chemical functionalization |
description |
This study assessed the effects of volume concentration (0.3%, 0.6%, 1.2%, and 12% v/v) and type of polymer flocculant (acrylamide, chitosan, and purified and non-purified acrylamide grafted chitosan) on the flocculation mechanism of kaolinite-rich mining tailings samples. We measured the flocculated samples’ transmittance using UV-VIS spectrometry to check for particles in the supernatant medium in order to verify the flocculation efficiency. It was observed that flocculation directly depends on the pH of the medium, the isoelectric point of the kaolinite, and the polymer chains’ molecular mass. The concentration of H+ and OH- ions is responsible for producing charges of different electrical nature on the particles present in the suspension, thereby affecting the flocculation process. In the acrylamide samples, the aggregation of particles occurs by electrostatic interaction; and in the other samples by bridging, suggesting that the chains’ molecular mass interferes in the coagulation and flocculation mechanisms. Moreover, the results of absorbance measurements and flocs’ apparent density highlight that the grafting of acrylamide on the chitosan chain may improve the kaolin waste flocculation. For flocculant concentrations of up to 1.2% (v/v), the absorbances were mostly below 1.0, indicating removal of suspended materials. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-05-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422022000500543 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422022000500543 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
10.21577/0100-4042.20170862 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Química |
publisher.none.fl_str_mv |
Sociedade Brasileira de Química |
dc.source.none.fl_str_mv |
Química Nova v.45 n.5 2022 reponame:Química Nova (Online) instname:Sociedade Brasileira de Química (SBQ) instacron:SBQ |
instname_str |
Sociedade Brasileira de Química (SBQ) |
instacron_str |
SBQ |
institution |
SBQ |
reponame_str |
Química Nova (Online) |
collection |
Química Nova (Online) |
repository.name.fl_str_mv |
Química Nova (Online) - Sociedade Brasileira de Química (SBQ) |
repository.mail.fl_str_mv |
quimicanova@sbq.org.br |
_version_ |
1750318121869115392 |