SISTEMA DE BAIXO CUSTO PARA EXECUÇÃO E MONITORAMENTO ON-LINE DE REAÇÕES FOTOCATALÍTICAS: APLICAÇÃO EM REDUÇÃO DE NITRO-FENOL
There is a global concern with pollutants and organic contaminants and efficient and inexpensive methods are sought for the treatment of these toxic products. Generally, large volume reactors and the use of expensive equipment are required to monitor a photoreaction. The present work proposes the construction of a colorimetric equipment, which allows the online monitoring of photoreactions, using low-cost materials that allow the analysis from small aliquots. To show the applicability of the system, we studied the reduction reaction of 4-nitrophenol (4NP) with NaBH4. The impedimetric sensor enabled to construct the kinetic curve of the decrease in the chromophore band. It was possible to observe that the 4NP reduction reaction depends on: (i) chromophore concentration; (ii) stability of the reducing agent and; (iii) repulsion between the anions. The system developed here opens doors, as it can be used using a photocatalyst in the form of film, and it has also proved to be an inexpensive alternative for both research and teaching laboratories, as it allows the execution of chemical physics practices such as kinetic monitoring of reactions and mathematical adjustment of the curves.
Main Authors: | , , , |
---|---|
Format: | Digital revista |
Language: | Portuguese |
Published: |
Sociedade Brasileira de Química
2021
|
Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422021001001364 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
oai:scielo:S0100-40422021001001364 |
---|---|
record_format |
ojs |
spelling |
oai:scielo:S0100-404220210010013642021-12-16SISTEMA DE BAIXO CUSTO PARA EXECUÇÃO E MONITORAMENTO ON-LINE DE REAÇÕES FOTOCATALÍTICAS: APLICAÇÃO EM REDUÇÃO DE NITRO-FENOLSalvati,Byanca S.Blaskievicz,Sirlon F.Corradini,Patricia G.Mascaro,Lucia H. impedimetric sensor online monitoring photoreduction remediation of organic contaminants There is a global concern with pollutants and organic contaminants and efficient and inexpensive methods are sought for the treatment of these toxic products. Generally, large volume reactors and the use of expensive equipment are required to monitor a photoreaction. The present work proposes the construction of a colorimetric equipment, which allows the online monitoring of photoreactions, using low-cost materials that allow the analysis from small aliquots. To show the applicability of the system, we studied the reduction reaction of 4-nitrophenol (4NP) with NaBH4. The impedimetric sensor enabled to construct the kinetic curve of the decrease in the chromophore band. It was possible to observe that the 4NP reduction reaction depends on: (i) chromophore concentration; (ii) stability of the reducing agent and; (iii) repulsion between the anions. The system developed here opens doors, as it can be used using a photocatalyst in the form of film, and it has also proved to be an inexpensive alternative for both research and teaching laboratories, as it allows the execution of chemical physics practices such as kinetic monitoring of reactions and mathematical adjustment of the curves.info:eu-repo/semantics/openAccessSociedade Brasileira de QuímicaQuímica Nova v.44 n.10 20212021-01-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422021001001364pt10.21577/0100-4042.20170794 |
institution |
SCIELO |
collection |
OJS |
country |
Brasil |
countrycode |
BR |
component |
Revista |
access |
En linea |
databasecode |
rev-scielo-br |
tag |
revista |
region |
America del Sur |
libraryname |
SciELO |
language |
Portuguese |
format |
Digital |
author |
Salvati,Byanca S. Blaskievicz,Sirlon F. Corradini,Patricia G. Mascaro,Lucia H. |
spellingShingle |
Salvati,Byanca S. Blaskievicz,Sirlon F. Corradini,Patricia G. Mascaro,Lucia H. SISTEMA DE BAIXO CUSTO PARA EXECUÇÃO E MONITORAMENTO ON-LINE DE REAÇÕES FOTOCATALÍTICAS: APLICAÇÃO EM REDUÇÃO DE NITRO-FENOL |
author_facet |
Salvati,Byanca S. Blaskievicz,Sirlon F. Corradini,Patricia G. Mascaro,Lucia H. |
author_sort |
Salvati,Byanca S. |
title |
SISTEMA DE BAIXO CUSTO PARA EXECUÇÃO E MONITORAMENTO ON-LINE DE REAÇÕES FOTOCATALÍTICAS: APLICAÇÃO EM REDUÇÃO DE NITRO-FENOL |
title_short |
SISTEMA DE BAIXO CUSTO PARA EXECUÇÃO E MONITORAMENTO ON-LINE DE REAÇÕES FOTOCATALÍTICAS: APLICAÇÃO EM REDUÇÃO DE NITRO-FENOL |
title_full |
SISTEMA DE BAIXO CUSTO PARA EXECUÇÃO E MONITORAMENTO ON-LINE DE REAÇÕES FOTOCATALÍTICAS: APLICAÇÃO EM REDUÇÃO DE NITRO-FENOL |
title_fullStr |
SISTEMA DE BAIXO CUSTO PARA EXECUÇÃO E MONITORAMENTO ON-LINE DE REAÇÕES FOTOCATALÍTICAS: APLICAÇÃO EM REDUÇÃO DE NITRO-FENOL |
title_full_unstemmed |
SISTEMA DE BAIXO CUSTO PARA EXECUÇÃO E MONITORAMENTO ON-LINE DE REAÇÕES FOTOCATALÍTICAS: APLICAÇÃO EM REDUÇÃO DE NITRO-FENOL |
title_sort |
sistema de baixo custo para execução e monitoramento on-line de reações fotocatalíticas: aplicação em redução de nitro-fenol |
description |
There is a global concern with pollutants and organic contaminants and efficient and inexpensive methods are sought for the treatment of these toxic products. Generally, large volume reactors and the use of expensive equipment are required to monitor a photoreaction. The present work proposes the construction of a colorimetric equipment, which allows the online monitoring of photoreactions, using low-cost materials that allow the analysis from small aliquots. To show the applicability of the system, we studied the reduction reaction of 4-nitrophenol (4NP) with NaBH4. The impedimetric sensor enabled to construct the kinetic curve of the decrease in the chromophore band. It was possible to observe that the 4NP reduction reaction depends on: (i) chromophore concentration; (ii) stability of the reducing agent and; (iii) repulsion between the anions. The system developed here opens doors, as it can be used using a photocatalyst in the form of film, and it has also proved to be an inexpensive alternative for both research and teaching laboratories, as it allows the execution of chemical physics practices such as kinetic monitoring of reactions and mathematical adjustment of the curves. |
publisher |
Sociedade Brasileira de Química |
publishDate |
2021 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422021001001364 |
work_keys_str_mv |
AT salvatibyancas sistemadebaixocustoparaexecucaoemonitoramentoonlinedereacoesfotocataliticasaplicacaoemreducaodenitrofenol AT blaskieviczsirlonf sistemadebaixocustoparaexecucaoemonitoramentoonlinedereacoesfotocataliticasaplicacaoemreducaodenitrofenol AT corradinipatriciag sistemadebaixocustoparaexecucaoemonitoramentoonlinedereacoesfotocataliticasaplicacaoemreducaodenitrofenol AT mascaroluciah sistemadebaixocustoparaexecucaoemonitoramentoonlinedereacoesfotocataliticasaplicacaoemreducaodenitrofenol |
_version_ |
1756387755049353216 |