Efeitos de agentes oxidantes e oxigênio dissolvido na descoloração do azo corante acid orange 7 por fotólise e fotocatálise Effects of oxidant agents and dissolved oxygen on the decolorization of acid orange 7 azo dye by photolysis and photocatalysis
<abstract language="eng">The decolorization of acid orange 7 azo dye by photolysis and photocatalysis by ZnO was investigated in the presence of oxidants such as NaClO3, NaBrO3, NaIO4, and K2S2O8 in an open reactor at 30 ºC. The decolorization was relatively fast at lower oxidants co...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Química
2009-01-01
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| Series: | Química Nova |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422009000600007 |
| _version_ | 1819017636561813504 |
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| author | Adriana Campano Lucilha Keiko Takashima |
| author_facet | Adriana Campano Lucilha Keiko Takashima |
| author_sort | Adriana Campano Lucilha |
| collection | DOAJ |
| description | <abstract language="eng">The decolorization of acid orange 7 azo dye by photolysis and photocatalysis by ZnO was investigated in the presence of oxidants such as NaClO3, NaBrO3, NaIO4, and K2S2O8 in an open reactor at 30 ºC. The decolorization was relatively fast at lower oxidants concentrations and slow rate at larger concentrations, except for persulfate in the photocatalysis. Concerning photolysis the rate constant enhanced gradually, except for chlorate, outreaching the obtained values by photocatalysis, at higher concentrations. The air saturation decreased the rate constant in both processes and indicated that the azo dye can be decolorized without dissolved oxygen in persulfate medium. |
| first_indexed | 2024-12-21T03:06:41Z |
| format | Article |
| id | doaj.art-aeefb84212be477a82d3caa3e03133ff |
| institution | Directory Open Access Journal |
| issn | 0100-4042 1678-7064 |
| language | English |
| last_indexed | 2024-12-21T03:06:41Z |
| publishDate | 2009-01-01 |
| publisher | Sociedade Brasileira de Química |
| record_format | Article |
| series | Química Nova |
| spelling | doaj.art-aeefb84212be477a82d3caa3e03133ff2022-12-21T19:18:05ZengSociedade Brasileira de QuímicaQuímica Nova0100-40421678-70642009-01-013261399140410.1590/S0100-40422009000600007Efeitos de agentes oxidantes e oxigênio dissolvido na descoloração do azo corante acid orange 7 por fotólise e fotocatálise Effects of oxidant agents and dissolved oxygen on the decolorization of acid orange 7 azo dye by photolysis and photocatalysisAdriana Campano LucilhaKeiko Takashima<abstract language="eng">The decolorization of acid orange 7 azo dye by photolysis and photocatalysis by ZnO was investigated in the presence of oxidants such as NaClO3, NaBrO3, NaIO4, and K2S2O8 in an open reactor at 30 ºC. The decolorization was relatively fast at lower oxidants concentrations and slow rate at larger concentrations, except for persulfate in the photocatalysis. Concerning photolysis the rate constant enhanced gradually, except for chlorate, outreaching the obtained values by photocatalysis, at higher concentrations. The air saturation decreased the rate constant in both processes and indicated that the azo dye can be decolorized without dissolved oxygen in persulfate medium.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422009000600007acid orange 7photolysisphotocatalysis |
| spellingShingle | Adriana Campano Lucilha Keiko Takashima Efeitos de agentes oxidantes e oxigênio dissolvido na descoloração do azo corante acid orange 7 por fotólise e fotocatálise Effects of oxidant agents and dissolved oxygen on the decolorization of acid orange 7 azo dye by photolysis and photocatalysis Química Nova acid orange 7 photolysis photocatalysis |
| title | Efeitos de agentes oxidantes e oxigênio dissolvido na descoloração do azo corante acid orange 7 por fotólise e fotocatálise Effects of oxidant agents and dissolved oxygen on the decolorization of acid orange 7 azo dye by photolysis and photocatalysis |
| title_full | Efeitos de agentes oxidantes e oxigênio dissolvido na descoloração do azo corante acid orange 7 por fotólise e fotocatálise Effects of oxidant agents and dissolved oxygen on the decolorization of acid orange 7 azo dye by photolysis and photocatalysis |
| title_fullStr | Efeitos de agentes oxidantes e oxigênio dissolvido na descoloração do azo corante acid orange 7 por fotólise e fotocatálise Effects of oxidant agents and dissolved oxygen on the decolorization of acid orange 7 azo dye by photolysis and photocatalysis |
| title_full_unstemmed | Efeitos de agentes oxidantes e oxigênio dissolvido na descoloração do azo corante acid orange 7 por fotólise e fotocatálise Effects of oxidant agents and dissolved oxygen on the decolorization of acid orange 7 azo dye by photolysis and photocatalysis |
| title_short | Efeitos de agentes oxidantes e oxigênio dissolvido na descoloração do azo corante acid orange 7 por fotólise e fotocatálise Effects of oxidant agents and dissolved oxygen on the decolorization of acid orange 7 azo dye by photolysis and photocatalysis |
| title_sort | efeitos de agentes oxidantes e oxigenio dissolvido na descoloracao do azo corante acid orange 7 por fotolise e fotocatalise effects of oxidant agents and dissolved oxygen on the decolorization of acid orange 7 azo dye by photolysis and photocatalysis |
| topic | acid orange 7 photolysis photocatalysis |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422009000600007 |
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