Anodic Oxidation of Sulfide to Sulfate: Effect of the Current Density on the Process Kinetics
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Journal of the Brazilian Chemical Society (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532017000400557 |
Resumo: | The kinetics of the conversion of sulfide to sulfate by electro-oxidation, using a boron-doped diamond (BDD) electrode was studied. Different applied current densities were tested, from 10 to 60 mA cm-2. The results showed that the electrochemical conversion of sulfide to sulfate occurs in steps, via intermediate production of other sulfur species. The oxidation rate of the sulfide ion is dependent on its concentration and current density. The reaction order varies with the current intensity, being 2 for the lower applied current intensity and high S2- concentration, which is compatible with a mechanism involving two S2- ions to give S22-. For higher current densities, where current control is less important, reaction order varies from 0.15 to 0.44 for the current densities of 20 and 60 mA cm-2, respectively. For the formation of SO42- from S2- electro-oxidation, the reaction orders with respect to sulfide concentration and current intensity are 0 and 1, respectively. |
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Journal of the Brazilian Chemical Society (Online) |
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Anodic Oxidation of Sulfide to Sulfate: Effect of the Current Density on the Process Kineticssulfide oxidationsulfate formationelectrochemical oxidationBDDkinetic studyThe kinetics of the conversion of sulfide to sulfate by electro-oxidation, using a boron-doped diamond (BDD) electrode was studied. Different applied current densities were tested, from 10 to 60 mA cm-2. The results showed that the electrochemical conversion of sulfide to sulfate occurs in steps, via intermediate production of other sulfur species. The oxidation rate of the sulfide ion is dependent on its concentration and current density. The reaction order varies with the current intensity, being 2 for the lower applied current intensity and high S2- concentration, which is compatible with a mechanism involving two S2- ions to give S22-. For higher current densities, where current control is less important, reaction order varies from 0.15 to 0.44 for the current densities of 20 and 60 mA cm-2, respectively. For the formation of SO42- from S2- electro-oxidation, the reaction orders with respect to sulfide concentration and current intensity are 0 and 1, respectively.Sociedade Brasileira de Química2017-04-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532017000400557Journal of the Brazilian Chemical Society v.28 n.4 2017reponame:Journal of the Brazilian Chemical Society (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.5935/0103-5053.20160197info:eu-repo/semantics/openAccessCaliari,Paulo C.Pacheco,Maria J.Ciríaco,Lurdes F.Lopes,Ana M. C.eng2017-03-06T00:00:00Zoai:scielo:S0103-50532017000400557Revistahttp://jbcs.sbq.org.brONGhttps://old.scielo.br/oai/scielo-oai.php||office@jbcs.sbq.org.br1678-47900103-5053opendoar:2017-03-06T00:00Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Anodic Oxidation of Sulfide to Sulfate: Effect of the Current Density on the Process Kinetics |
title |
Anodic Oxidation of Sulfide to Sulfate: Effect of the Current Density on the Process Kinetics |
spellingShingle |
Anodic Oxidation of Sulfide to Sulfate: Effect of the Current Density on the Process Kinetics Caliari,Paulo C. sulfide oxidation sulfate formation electrochemical oxidation BDD kinetic study |
title_short |
Anodic Oxidation of Sulfide to Sulfate: Effect of the Current Density on the Process Kinetics |
title_full |
Anodic Oxidation of Sulfide to Sulfate: Effect of the Current Density on the Process Kinetics |
title_fullStr |
Anodic Oxidation of Sulfide to Sulfate: Effect of the Current Density on the Process Kinetics |
title_full_unstemmed |
Anodic Oxidation of Sulfide to Sulfate: Effect of the Current Density on the Process Kinetics |
title_sort |
Anodic Oxidation of Sulfide to Sulfate: Effect of the Current Density on the Process Kinetics |
author |
Caliari,Paulo C. |
author_facet |
Caliari,Paulo C. Pacheco,Maria J. Ciríaco,Lurdes F. Lopes,Ana M. C. |
author_role |
author |
author2 |
Pacheco,Maria J. Ciríaco,Lurdes F. Lopes,Ana M. C. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Caliari,Paulo C. Pacheco,Maria J. Ciríaco,Lurdes F. Lopes,Ana M. C. |
dc.subject.por.fl_str_mv |
sulfide oxidation sulfate formation electrochemical oxidation BDD kinetic study |
topic |
sulfide oxidation sulfate formation electrochemical oxidation BDD kinetic study |
description |
The kinetics of the conversion of sulfide to sulfate by electro-oxidation, using a boron-doped diamond (BDD) electrode was studied. Different applied current densities were tested, from 10 to 60 mA cm-2. The results showed that the electrochemical conversion of sulfide to sulfate occurs in steps, via intermediate production of other sulfur species. The oxidation rate of the sulfide ion is dependent on its concentration and current density. The reaction order varies with the current intensity, being 2 for the lower applied current intensity and high S2- concentration, which is compatible with a mechanism involving two S2- ions to give S22-. For higher current densities, where current control is less important, reaction order varies from 0.15 to 0.44 for the current densities of 20 and 60 mA cm-2, respectively. For the formation of SO42- from S2- electro-oxidation, the reaction orders with respect to sulfide concentration and current intensity are 0 and 1, respectively. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-04-01 |
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=S0103-50532017000400557 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532017000400557 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.5935/0103-5053.20160197 |
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 |
Journal of the Brazilian Chemical Society v.28 n.4 2017 reponame:Journal of the Brazilian Chemical Society (Online) instname:Sociedade Brasileira de Química (SBQ) instacron:SBQ |
instname_str |
Sociedade Brasileira de Química (SBQ) |
instacron_str |
SBQ |
institution |
SBQ |
reponame_str |
Journal of the Brazilian Chemical Society (Online) |
collection |
Journal of the Brazilian Chemical Society (Online) |
repository.name.fl_str_mv |
Journal of the Brazilian Chemical Society (Online) - Sociedade Brasileira de Química (SBQ) |
repository.mail.fl_str_mv |
||office@jbcs.sbq.org.br |
_version_ |
1750318179212591104 |