Degradação fotocatalítica de tartrazina com TiO2 imobilizado em esferas de alginato

Detalhes bibliográficos
Autor(a) principal: Dalponte,Ithiara
Data de Publicação: 2016
Outros Autores: Mathias,Alvaro Luiz, Jorge,Regina Maria Matos, Weinschutz,Regina
Tipo de documento: Artigo
Idioma: por
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422016001001165
Resumo: The potential of heterogeneous photocatalysis using TiO2 immobilized in alginate beads was evaluated for the degradation of tartrazine yellow azo dye. The treatment was performed under the action of a high-pressure mercury vapor lamp of 125 W and the degradation performance was investigated with the absorbance supplied by a photocolorimeter. Alginate beads with TiO2 were prepared and the catalyst was quantified by thermogravimetric analysis (TG) and characterized by scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS) and specific area analysis (BET). The immobilization was performed as a very simple and reproductible technique. The bead diameter was approximately 1 mm and its surface presented a homogeneous dispersion of catalytic sites containing about 1-2% (w/w) of TiO2. The TiO2/alginate beads presented low density and can be easier separated than the TiO2 dispersed from the reacting medium, remaining available to be reused in another batch. The dye degradation reached 30% after 120 minutes of irradiation, for the following conditions: alcaline pH (pH=9.0), 3 g of TiO2/alginate beads and 20 mol L-1 dye concentration.
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spelling Degradação fotocatalítica de tartrazina com TiO2 imobilizado em esferas de alginatoheterogeneous photocatalysiscalcium alginateazo dyeThe potential of heterogeneous photocatalysis using TiO2 immobilized in alginate beads was evaluated for the degradation of tartrazine yellow azo dye. The treatment was performed under the action of a high-pressure mercury vapor lamp of 125 W and the degradation performance was investigated with the absorbance supplied by a photocolorimeter. Alginate beads with TiO2 were prepared and the catalyst was quantified by thermogravimetric analysis (TG) and characterized by scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS) and specific area analysis (BET). The immobilization was performed as a very simple and reproductible technique. The bead diameter was approximately 1 mm and its surface presented a homogeneous dispersion of catalytic sites containing about 1-2% (w/w) of TiO2. The TiO2/alginate beads presented low density and can be easier separated than the TiO2 dispersed from the reacting medium, remaining available to be reused in another batch. The dye degradation reached 30% after 120 minutes of irradiation, for the following conditions: alcaline pH (pH=9.0), 3 g of TiO2/alginate beads and 20 mol L-1 dye concentration.Sociedade Brasileira de Química2016-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422016001001165Química Nova v.39 n.10 2016reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.21577/0100-4042.20160141info:eu-repo/semantics/openAccessDalponte,IthiaraMathias,Alvaro LuizJorge,Regina Maria MatosWeinschutz,Reginapor2016-12-20T00:00:00Zoai:scielo:S0100-40422016001001165Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2016-12-20T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Degradação fotocatalítica de tartrazina com TiO2 imobilizado em esferas de alginato
title Degradação fotocatalítica de tartrazina com TiO2 imobilizado em esferas de alginato
spellingShingle Degradação fotocatalítica de tartrazina com TiO2 imobilizado em esferas de alginato
Dalponte,Ithiara
heterogeneous photocatalysis
calcium alginate
azo dye
title_short Degradação fotocatalítica de tartrazina com TiO2 imobilizado em esferas de alginato
title_full Degradação fotocatalítica de tartrazina com TiO2 imobilizado em esferas de alginato
title_fullStr Degradação fotocatalítica de tartrazina com TiO2 imobilizado em esferas de alginato
title_full_unstemmed Degradação fotocatalítica de tartrazina com TiO2 imobilizado em esferas de alginato
title_sort Degradação fotocatalítica de tartrazina com TiO2 imobilizado em esferas de alginato
author Dalponte,Ithiara
author_facet Dalponte,Ithiara
Mathias,Alvaro Luiz
Jorge,Regina Maria Matos
Weinschutz,Regina
author_role author
author2 Mathias,Alvaro Luiz
Jorge,Regina Maria Matos
Weinschutz,Regina
author2_role author
author
author
dc.contributor.author.fl_str_mv Dalponte,Ithiara
Mathias,Alvaro Luiz
Jorge,Regina Maria Matos
Weinschutz,Regina
dc.subject.por.fl_str_mv heterogeneous photocatalysis
calcium alginate
azo dye
topic heterogeneous photocatalysis
calcium alginate
azo dye
description The potential of heterogeneous photocatalysis using TiO2 immobilized in alginate beads was evaluated for the degradation of tartrazine yellow azo dye. The treatment was performed under the action of a high-pressure mercury vapor lamp of 125 W and the degradation performance was investigated with the absorbance supplied by a photocolorimeter. Alginate beads with TiO2 were prepared and the catalyst was quantified by thermogravimetric analysis (TG) and characterized by scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS) and specific area analysis (BET). The immobilization was performed as a very simple and reproductible technique. The bead diameter was approximately 1 mm and its surface presented a homogeneous dispersion of catalytic sites containing about 1-2% (w/w) of TiO2. The TiO2/alginate beads presented low density and can be easier separated than the TiO2 dispersed from the reacting medium, remaining available to be reused in another batch. The dye degradation reached 30% after 120 minutes of irradiation, for the following conditions: alcaline pH (pH=9.0), 3 g of TiO2/alginate beads and 20 mol L-1 dye concentration.
publishDate 2016
dc.date.none.fl_str_mv 2016-12-01
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=S0100-40422016001001165
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422016001001165
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv 10.21577/0100-4042.20160141
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.39 n.10 2016
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
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